chore: cut v1.0.12 with reviewed release notes (#493)

This release prep captures the version bump and changelog entry for v1.0.12 without pulling unrelated workspace edits into the release branch.

Change-Id: Ib343337c4851b7cc15a52dd0068795a92092b781
Constraint: Keep the release PR scoped to package version and changelog only
Rejected: Include .gitignore and local workspace files | unrelated to this release PR
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep release notes aligned with shipped changes only; exclude reverted work from summaries
Tested: make unit-test
Tested: go mod tidy
Tested: go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.1.6 run --new-from-rev=origin/main
Not-tested: Manual tag/release publishing flow

.github/workflows/cli-e2e.yml

@@ -25,6 +25,8 @@ on:
 
 permissions:
   contents: read
+  actions: read
+  checks: write
 
 jobs:
   cli-e2e:
@@ -65,71 +67,17 @@ jobs:
             echo "No CLI E2E packages to test after exclusions."
             exit 1
           fi
-          go run gotest.tools/gotestsum@v1.12.3 --format testname --junitfile cli-e2e-report.xml -- -count=1 -v $packages
+          # gotestsum requires --packages when --rerun-fails is combined with go test args after --.
+          packages_arg=$(printf '%s\n' "$packages" | paste -sd' ' -)
+          go run gotest.tools/gotestsum@v1.12.3 --rerun-fails=2 --rerun-fails-max-failures=20 --packages="$packages_arg" --format testname --junitfile cli-e2e-report.xml -- -count=1 -v
 
-      - name: Summarize CLI E2E test report
+      - name: Publish CLI E2E test report
         if: ${{ !cancelled() }}
-        run: |
-          python3 - <<'PY'
-          import os
-          import xml.etree.ElementTree as ET
-
-          report_path = "cli-e2e-report.xml"
-          summary_path = os.environ["GITHUB_STEP_SUMMARY"]
-
-          root = ET.parse(report_path).getroot()
-          suites = [root] if root.tag == "testsuite" else root.findall("testsuite")
-
-          tests = failures = errors = skipped = 0
-          failed_cases = []
-          skipped_cases = []
-
-          for suite in suites:
-            tests += int(suite.attrib.get("tests", 0))
-            failures += int(suite.attrib.get("failures", 0))
-            errors += int(suite.attrib.get("errors", 0))
-            skipped += int(suite.attrib.get("skipped", 0))
-
-            for case in suite.findall("testcase"):
-              classname = case.attrib.get("classname", "")
-              name = case.attrib.get("name", "")
-              label = f"{classname}.{name}" if classname else name
-
-              failure = case.find("failure")
-              error = case.find("error")
-              skipped_node = case.find("skipped")
-
-              if failure is not None or error is not None:
-                message = ""
-                node = failure if failure is not None else error
-                if node is not None:
-                  message = node.attrib.get("message", "") or (node.text or "").strip()
-                failed_cases.append((label, message))
-              elif skipped_node is not None:
-                message = skipped_node.attrib.get("message", "") or (skipped_node.text or "").strip()
-                skipped_cases.append((label, message))
-
-          passed = tests - failures - errors - skipped
-
-          with open(summary_path, "a", encoding="utf-8") as f:
-            f.write("## CLI E2E Test Report\n\n")
-            f.write(f"- Total: {tests}\n")
-            f.write(f"- Passed: {passed}\n")
-            f.write(f"- Failed: {failures}\n")
-            f.write(f"- Errors: {errors}\n")
-            f.write(f"- Skipped: {skipped}\n\n")
-
-            if failed_cases:
-              f.write("### Failed Tests\n\n")
-              for label, message in failed_cases:
-                detail = f" - {message}" if message else ""
-                f.write(f"- `{label}`{detail}\n")
-              f.write("\n")
-
-            if skipped_cases:
-              f.write("### Skipped Tests\n\n")
-              for label, message in skipped_cases:
-                detail = f" - {message}" if message else ""
-                f.write(f"- `{label}`{detail}\n")
-              f.write("\n")
-          PY
+        uses: dorny/test-reporter@a43b3a5f7366b97d083190328d2c652e1a8b6aa2 # v3.0.0
+        with:
+          name: CLI E2E Tests
+          path: cli-e2e-report.xml
+          reporter: java-junit
+          use-actions-summary: true
+          list-suites: all
+          list-tests: all

.github/workflows/license-header.yml

@@ -0,0 +1,26 @@
+name: License Header
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - "**/*.go"
+      - "**/*.js"
+      - "**/*.py"
+      - .licenserc.yaml
+      - .github/workflows/license-header.yml
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  header-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+
+      - name: Check license headers
+        uses: apache/skywalking-eyes/header@8c96ee223558797cdd9eba82c0919258e1cf2dad
+        with:
+          config: .licenserc.yaml

.gitignore

@@ -31,6 +31,8 @@ tests/mail/reports/
 
 /log/
 
+
 # Generated / test artifacts
 internal/registry/meta_data.json
 cmd/api/download.bin
+app.log

.golangci.yml

@@ -27,6 +27,7 @@ linters:
     - reassign        # checks that package variables are not reassigned
     - unconvert       # removes unnecessary type conversions
     - unused          # checks for unused constants, variables, functions and types
+    - depguard        # blocks forbidden package imports
     - forbidigo       # forbids specific function calls
 
     # To enable later after fixing existing issues:
@@ -45,6 +46,7 @@ linters:
         linters:
           - bodyclose
           - gocritic
+          - depguard
           - forbidigo
       - path-except: (shortcuts/|internal/)
         linters:
@@ -54,79 +56,56 @@ linters:
           - forbidigo
 
   settings:
+    depguard:
+      rules:
+        shortcuts-no-vfs:
+          files:
+            - "**/shortcuts/**"
+          deny:
+            - pkg: "github.com/larksuite/cli/internal/vfs"
+              desc: >-
+                shortcuts must not import internal/vfs directly.
+                Use runtime.FileIO() for file operations or runtime.ValidatePath() for path validation.
+            - pkg: "github.com/larksuite/cli/internal/vfs/localfileio"
+              desc: >-
+                shortcuts must not import internal/vfs/localfileio directly.
+                Use runtime.FileIO() for file operations or runtime.ValidatePath() for path validation.
     forbidigo:
       forbid:
-        # ── Filesystem operations: use internal/vfs instead ──
-        - pattern: os\.Stat\b
-          msg: "use vfs.Stat() from internal/vfs"
-        - pattern: os\.Lstat\b
-          msg: "use vfs.Lstat() from internal/vfs"
-        - pattern: os\.Open\b
-          msg: "use vfs.Open() from internal/vfs"
-        - pattern: os\.OpenFile\b
-          msg: "use vfs.OpenFile() from internal/vfs"
-        - pattern: os\.Create\b
-          msg: "use vfs.OpenFile() from internal/vfs"
-        - pattern: os\.CreateTemp\b
+        # ── os: already wrapped in internal/vfs ──
+        - pattern: os\.(Stat|Lstat|Open|OpenFile|Rename|ReadFile|WriteFile|Getwd|UserHomeDir|ReadDir)\b
+          msg: "use the corresponding vfs.Xxx() from internal/vfs"
+        - pattern: os\.(Create|CreateTemp|MkdirTemp)\b
           msg: >-
-            internal/: use vfs.CreateTemp() from internal/vfs.
-            shortcuts/: avoid temp files entirely — use io.Reader streaming or in-memory buffers instead.
-        - pattern: os\.Mkdir\b
-          msg: "use vfs.MkdirAll() from internal/vfs"
-        - pattern: os\.MkdirAll\b
+            internal/: use vfs.CreateTemp() or vfs.OpenFile().
+            shortcuts/: avoid temp files — use io.Reader streaming or in-memory buffers.
+        - pattern: os\.Mkdir(All)?\b
           msg: "use vfs.MkdirAll() from internal/vfs"
         - pattern: os\.Remove\b
           msg: >-
             internal/: use vfs.Remove() from internal/vfs.
-            shortcuts/: avoid temp files entirely — use io.Reader streaming or in-memory buffers instead.
+            shortcuts/: avoid temp files — use io.Reader streaming or in-memory buffers.
         - pattern: os\.RemoveAll\b
           msg: >-
             internal/: add RemoveAll to internal/vfs/fs.go first, then use vfs.RemoveAll().
-            shortcuts/: avoid temp files entirely — use io.Reader streaming or in-memory buffers instead.
-        - pattern: os\.Rename\b
-          msg: "use vfs.Rename() from internal/vfs"
-        - pattern: os\.ReadFile\b
-          msg: "use vfs.ReadFile() from internal/vfs"
-        - pattern: os\.WriteFile\b
-          msg: "use vfs.WriteFile() from internal/vfs"
-        - pattern: os\.ReadDir\b
-          msg: "add ReadDir to internal/vfs/fs.go first, then use vfs.ReadDir()"
-        - pattern: os\.Getwd\b
-          msg: "use vfs.Getwd() from internal/vfs"
-        - pattern: os\.Chdir\b
-          msg: "add Chdir to internal/vfs/fs.go first, then use vfs.Chdir()"
-        - pattern: os\.UserHomeDir\b
-          msg: "use vfs.UserHomeDir() from internal/vfs"
-        - pattern: os\.Chmod\b
-          msg: "add Chmod to internal/vfs/fs.go first, then use vfs.Chmod()"
-        - pattern: os\.Chown\b
-          msg: "add Chown to internal/vfs/fs.go first, then use vfs.Chown()"
-        - pattern: os\.Lchown\b
-          msg: "add Lchown to internal/vfs/fs.go first, then use vfs.Lchown()"
-        - pattern: os\.Link\b
-          msg: "add Link to internal/vfs/fs.go first, then use vfs.Link()"
-        - pattern: os\.Symlink\b
-          msg: "add Symlink to internal/vfs/fs.go first, then use vfs.Symlink()"
-        - pattern: os\.Readlink\b
-          msg: "add Readlink to internal/vfs/fs.go first, then use vfs.Readlink()"
-        - pattern: os\.Truncate\b
-          msg: "add Truncate to internal/vfs/fs.go first, then use vfs.Truncate()"
-        - pattern: os\.DirFS\b
-          msg: "add DirFS to internal/vfs/fs.go first, then use vfs.DirFS()"
-        - pattern: os\.SameFile\b
-          msg: "add SameFile to internal/vfs/fs.go first, then use vfs.SameFile()"
-        # ── IO streams: use IOStreams from cmdutil instead ──
-        - pattern: os\.Stdin\b
-          msg: "use IOStreams.In instead of os.Stdin"
-        - pattern: os\.Stdout\b
-          msg: "use IOStreams.Out instead of os.Stdout"
-        - pattern: os\.Stderr\b
-          msg: "use IOStreams.ErrOut instead of os.Stderr"
-        # ── Process-level rules ──
+            shortcuts/: avoid temp files — use io.Reader streaming or in-memory buffers.
+        # ── os: not yet in vfs — add to vfs/fs.go first ──
+        - pattern: os\.(Chdir|Chmod|Chown|Lchown|Chtimes|CopyFS|DirFS|Link|Symlink|Readlink|Truncate|SameFile)\b
+          msg: "add this function to internal/vfs/fs.go first, then use vfs.Xxx()"
+        # ── os: IO streams ──
+        - pattern: os\.Std(in|out|err)\b
+          msg: "use IOStreams (In/Out/ErrOut) instead of os.Stdin/Stdout/Stderr"
+        # ── os: process ──
         - pattern: os\.Exit\b
           msg: >-
             Do not use os.Exit in shortcuts/. Return an error instead and let
             the caller (cmd layer) decide how to terminate.
+        # ── filepath: functions that access the filesystem ──
+        - pattern: filepath\.(EvalSymlinks|Walk|WalkDir|Glob|Abs)\b
+          msg: >-
+            These filepath functions access the filesystem directly.
+            internal/: use vfs helpers or localfileio path validation.
+            shortcuts/: use runtime.ValidatePath() or runtime.FileIO().
       analyze-types: true
     gocritic:
       disabled-checks:

.licenserc.yaml

@@ -0,0 +1,16 @@
+header:
+  license:
+    content: |
+      Copyright (c) [year] Lark Technologies Pte. Ltd.
+      SPDX-License-Identifier: MIT
+    copyright-year: "2026"
+
+  paths:
+    - '**/*.go'
+    - '**/*.js'
+    - '**/*.py'
+
+  paths-ignore:
+    - '**/testdata/**'
+
+  comment: on-failure

CHANGELOG.md

@@ -2,6 +2,172 @@
 
 All notable changes to this project will be documented in this file.
 
+## [v1.0.12] - 2026-04-15
+
+### Features
+
+- Add guided npm install flow that installs or upgrades the CLI, installs AI skills, and walks through app config and auth login (#464)
+- **mail**: Add email signature support with `+signature`, `--signature-id` compose flags, and draft signature edit operations (#485)
+- **mail**: Return recall hints for sent emails when recall is available (#481)
+- **slides**: Add `+media-upload` and support `@path` image placeholders in `+create --slides` (#450)
+
+### Documentation
+
+- **mail**: Add recipient search guidance to the mail skill workflow (#437)
+- **calendar/vc**: Route past meeting queries to `lark-vc` and clarify historical date matching in skills (#482, #480)
+
+## [v1.0.11] - 2026-04-14
+
+### Features
+
+- **sheets**: Add dropdown shortcuts for data validation management (`+set-dropdown`, `+update-dropdown`, `+get-dropdown`, `+delete-dropdown`) (#461)
+- **task**: Add task search, tasklist search, related-task, set-ancestor, and subscribe-event shortcuts (#377)
+- Streamline interactive login by removing the extra auth confirmation step (#451)
+
+### Bug Fixes
+
+- **base**: Validate JSON object inputs for base shortcuts and reject `null` objects (#458)
+
+### Documentation
+
+- **sheets**: Document value formats for formulas and special field types (#456)
+- **readme**: Add Attendance to the features table (#460)
+
+## [v1.0.10] - 2026-04-13
+
+### Features
+
+- **im**: Support im oapi range download for large files (#283)
+- **sheets**: Add filter view and condition shortcuts (#422)
+- **wiki**: Add wiki move shortcut with async task polling (#436)
+- **drive**: Add drive `+create-shortcut` shortcut (#432)
+- **drive**: Add drive files patch metadata API (#444)
+- **task**: Support `--section-guid` flag in tasklist-task-add shortcut (#430)
+
+### Bug Fixes
+
+- **base**: Support large base attachment uploads (#441)
+- **config**: Clarify init copy for TTY, preserve original for AI (#448)
+- **im**: Reject `--user-id` under bot identity for chat-messages-list (#340)
+- **mail**: Add missing scopes for mail `+watch` shortcut (#357)
+- **mail**: Restrict `--output-dir` to current working directory (#376)
+
+### Documentation
+
+- **wiki**: Add wiki member operations to lark-wiki skill (#417)
+- **task**: Document sections API resources, permissions, and URL parsing (#430)
+- **doc**: Clarify when markdown escaping is needed (#312)
+
+## [v1.0.9] - 2026-04-11
+
+### Features
+
+- Add attendance `user_task.query` (#405)
+- Support minutes search (#359)
+- **slides**: Add slides `+create` shortcut with `--slides` one-step creation (#389)
+- **slides**: Return presentation URL in slides `+create` output (#425)
+- **sheets**: Add dimension shortcuts for row/column operations (#413)
+- **sheets**: Add cell operation shortcuts for merge, replace, and style (#412)
+- **drive**: Add drive folder delete shortcut with async task polling (#415)
+
+### Documentation
+
+- **drive**: Add guide for granting document permission to current bot (#414)
+
+## [v1.0.8] - 2026-04-10
+
+### Features
+
+- Add `update` command with self-update, verification, and rollback (#391)
+- Add `--file` flag for multipart/form-data file uploads (#395)
+- Support file comment reply reactions (#380)
+- **base**: Add `+dashboard-arrange` command for auto-arranging dashboard blocks layout and `text` block type with Markdown support (#388)
+- **base**: Add record batch `+add` / `+set` shortcuts (#277)
+- **base**: Add `+record-search` for keyword-based record search (#328)
+- **base**: Add view visible fields `+get` / `+set` shortcuts (#326)
+- **base**: Add record field filters (#327)
+- **base**: Optimize workflow skills (#345)
+- **calendar**: Add room find workflow (#403)
+- **mail**: Add `--page-token` and `--page-size` to mail `+triage` (#301)
+- **whiteboard**: Add `+query` shortcut and enhance `+update` with Mermaid/PlantUML support (#382)
+
+### Bug Fixes
+
+- Improve error hints for sandbox and initialization issues (#384)
+- Fix markdown line breaks support (#338)
+- Return raw base field and view responses (#378)
+- **base**: Return raw table list response and clarify sort help (#393)
+- **calendar**: Add default video meeting to `+create` (#383)
+- **mail**: Replace `os.Exit` with graceful shutdown in mail watch (#350)
+
+### Documentation
+
+- **base**: Document Base attachment download via docs `+media-download` (#404)
+- Reorganize lark-base skill guidance (#374)
+
+## [v1.0.7] - 2026-04-09
+
+### Features
+
+- Auto-grant current user access for bot-created docs, sheets, imports, and uploads (#360)
+- **mail**: Add `send_as` alias support, mailbox/sender discovery APIs, and mail rules API
+- **vc**: Extract note doc tokens from calendar event relation API (#333)
+- **wiki**: Add wiki node create shortcut (#320)
+- **sheets**: Add `+write-image` shortcut (#343)
+- **docs**: Add media-preview shortcut (#334)
+- **docs**: Add support for additional search filters (#353)
+
+### Bug Fixes
+
+- **api**: Support stdin and quoted JSON inputs on Windows (#367)
+- **doc**: Post-process `docs +fetch` output to improve round-trip fidelity (#214)
+- **run**: Add missing binary check for lark-cli execution (#362)
+- **config**: Validate appId and appSecret keychain key consistency (#295)
+
+### Refactor
+
+- Route base import guidance to drive `+import` (#368)
+- Migrate mail shortcuts to FileIO (#356)
+- Migrate drive/doc/sheets shortcuts to FileIO (#339)
+- Migrate base shortcuts to FileIO (#347)
+
+### Documentation
+
+- **lark-doc**: Document advanced boolean and intitle search syntax for AI agents (#210)
+
+### Chore
+
+- Add depguard and forbidigo rules to guide FileIO adoption (#342)
+
+## [v1.0.6] - 2026-04-08
+
+### Features
+
+- Improve login scope validation and success output (#317)
+- **task**: Support starting pagination from page token (#332)
+- Support multipart doc media uploads (#294)
+- **mail**: Auto-resolve local image paths in all draft entry points (#205)
+- **vc**: Add `+recording` shortcut for `meeting_id` to `minute_token` conversion (#246)
+
+### Bug Fixes
+
+- Resolve concurrency races in RuntimeContext (#330)
+- **config**: Save empty config before clearing keychain entries (#291)
+- Reject positional arguments in shortcuts (#227)
+- Improve raw API diagnostics for invalid or empty JSON responses (#257)
+- **docs**: Normalize `board_tokens` in `+create` response for mermaid/whiteboard content (#10)
+- **task**: Clarify `--complete` flag help for `get-my-tasks` (#310)
+- **help**: Point root help Agent Skills link to README section (#289)
+
+### Documentation
+
+- Clarify `--complete` flag behavior in `get-my-tasks` reference (#308)
+
+### Refactor
+
+- Migrate VC/minutes shortcuts to FileIO (#336)
+- Migrate common/client/IM to FileIO and add localfileio tests (#322)
+
 ## [v1.0.5] - 2026-04-07
 
 ### Features
@@ -193,6 +359,13 @@ Bundled AI agent skills for intelligent assistance:
 - Bilingual documentation (English & Chinese).
 - CI/CD pipelines: linting, testing, coverage reporting, and automated releases.
 
+[v1.0.12]: https://github.com/larksuite/cli/releases/tag/v1.0.12
+[v1.0.11]: https://github.com/larksuite/cli/releases/tag/v1.0.11
+[v1.0.10]: https://github.com/larksuite/cli/releases/tag/v1.0.10
+[v1.0.9]: https://github.com/larksuite/cli/releases/tag/v1.0.9
+[v1.0.8]: https://github.com/larksuite/cli/releases/tag/v1.0.8
+[v1.0.7]: https://github.com/larksuite/cli/releases/tag/v1.0.7
+[v1.0.6]: https://github.com/larksuite/cli/releases/tag/v1.0.6
 [v1.0.5]: https://github.com/larksuite/cli/releases/tag/v1.0.5
 [v1.0.4]: https://github.com/larksuite/cli/releases/tag/v1.0.4
 [v1.0.3]: https://github.com/larksuite/cli/releases/tag/v1.0.3

README.md

@@ -6,14 +6,14 @@
 
 [中文版](./README.zh.md) | [English](./README.md)
 
-The official [Lark/Feishu](https://www.larksuite.com/) CLI tool, maintained by the [larksuite](https://github.com/larksuite) team — built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 20 AI Agent [Skills](./skills/).
+The official [Lark/Feishu](https://www.larksuite.com/) CLI tool, maintained by the [larksuite](https://github.com/larksuite) team — built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Slides, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 22 AI Agent [Skills](./skills/).
 
 [Install](#installation--quick-start) · [AI Agent Skills](#agent-skills) · [Auth](#authentication) · [Commands](#three-layer-command-system) · [Advanced](#advanced-usage) · [Security](#security--risk-warnings-read-before-use) · [Contributing](#contributing)
 
 ## Why lark-cli?
 
-- **Agent-Native Design** — 20 structured [Skills](./skills/) out of the box, compatible with popular AI tools — Agents can operate Lark with zero extra setup
-- **Wide Coverage** — 12 business domains, 200+ curated commands, 20 AI Agent [Skills](./skills/)
+- **Agent-Native Design** — 22 structured [Skills](./skills/) out of the box, compatible with popular AI tools — Agents can operate Lark with zero extra setup
+- **Wide Coverage** — 14 business domains, 200+ curated commands, 22 AI Agent [Skills](./skills/)
 - **AI-Friendly & Optimized** — Every command is tested with real Agents, featuring concise parameters, smart defaults, and structured output to maximize Agent call success rates
 - **Open Source, Zero Barriers** — MIT license, ready to use, just `npm install`
 - **Up and Running in 3 Minutes** — One-click app creation, interactive login, from install to first API call in just 3 steps
@@ -30,11 +30,13 @@ The official [Lark/Feishu](https://www.larksuite.com/) CLI tool, maintained by t
 | 📁 Drive      | Upload and download files, search docs & wiki, manage comments                                                                    |
 | 📊 Base       | Create and manage tables, fields, records, views, dashboards, workflows, forms, roles & permissions, data aggregation & analytics |
 | 📈 Sheets     | Create, read, write, append, find, and export spreadsheet data                                                                    |
+| 🖼️ Slides     | Create and manage presentations, read presentation content, and add or remove slides                                             |
 | ✅ Tasks      | Create, query, update, and complete tasks; manage task lists, subtasks, comments & reminders                                      |
 | 📚 Wiki       | Create and manage knowledge spaces, nodes, and documents                                                                          |
 | 👤 Contact    | Search users by name/email/phone, get user profiles                                                                               |
 | 📧 Mail       | Browse, search, read emails, send, reply, forward, manage drafts, watch new mail                                                  |
 | 🎥 Meetings   | Search meeting records, query meeting minutes & recordings                                                                        |
+| 🕐 Attendance | Query personal attendance check-in records                                                                                        |
 | ✍️ Approval   | Query approval tasks, approve/reject/transfer tasks, cancel and CC instances                                                      |
 
 ## Installation & Quick Start
@@ -136,6 +138,7 @@ lark-cli auth status
 | `lark-doc`                      | Create, read, update, search documents (Markdown-based)                                                        |
 | `lark-drive`                    | Upload, download files, manage permissions & comments                                                          |
 | `lark-sheets`                   | Create, read, write, append, find, export spreadsheets                                                         |
+| `lark-slides`                   | Create and manage presentations, read presentation content, and add or remove slides                          |
 | `lark-base`                     | Tables, fields, records, views, dashboards, data aggregation & analytics                                       |
 | `lark-task`                     | Tasks, task lists, subtasks, reminders, member assignment                                                      |
 | `lark-mail`                     | Browse, search, read emails, send, reply, forward, draft management, watch new mail                            |
@@ -147,6 +150,7 @@ lark-cli auth status
 | `lark-minutes`                  | Minutes metadata & AI artifacts (summary, todos, chapters)                                                     |
 | `lark-openapi-explorer`         | Explore underlying APIs from official docs                                                                     |
 | `lark-skill-maker`              | Custom skill creation framework                                                                                |
+| `lark-attendance`               | Query personal attendance check-in records                                                                     |
 | `lark-approval`                 | Query approval tasks, approve/reject/transfer tasks, cancel and CC instances                                   |
 | `lark-workflow-meeting-summary` | Workflow: meeting minutes aggregation & structured report                                                      |
 | `lark-workflow-standup-report`  | Workflow: agenda & todo summary                                                                                |

README.zh.md

@@ -6,14 +6,14 @@
 
 [中文版](./README.zh.md) | [English](./README.md)
 
-飞书官方 CLI 工具，由 [larksuite](https://github.com/larksuite) 团队维护 — 让人类和 AI Agent 都能在终端中操作飞书。覆盖消息、文档、多维表格、电子表格、日历、邮箱、任务、会议等核心业务域，提供 200+ 命令及 20 个 AI Agent [Skills](./skills/)。
+飞书官方 CLI 工具，由 [larksuite](https://github.com/larksuite) 团队维护 — 让人类和 AI Agent 都能在终端中操作飞书。覆盖消息、文档、多维表格、电子表格、幻灯片、日历、邮箱、任务、会议等核心业务域，提供 200+ 命令及 22 个 AI Agent [Skills](./skills/)。
 
 [安装](#安装与快速开始) · [AI Agent Skills](#agent-skills) · [认证](#认证) · [命令](#三层命令调用) · [进阶用法](#进阶用法) · [安全](#安全与风险提示使用前必读) · [贡献](#贡献)
 
 ## 为什么选 lark-cli？
 
-- **为 Agent 原生设计** — [Skills](./skills/) 开箱即用，适配主流 AI 工具，Agent 无需额外适配即可操作飞书
-- **覆盖面广** — 12 大业务域、200+ 精选命令、 20 个 AI Agent [Skills](./skills/)
+- **为 Agent 原生设计** — 22 个 [Skills](./skills/) 开箱即用，适配主流 AI 工具，Agent 无需额外适配即可操作飞书
+- **覆盖面广** — 14 大业务域、200+ 精选命令、22 个 AI Agent [Skills](./skills/)
 - **AI 友好调优** — 每条命令经过 Agent 实测验证，提供更友好的参数、智能默认值和结构化输出，大幅提升 Agent 调用成功率
 - **开源零门槛** — MIT 协议，开箱即用，`npm install` 即可使用
 - **三分钟上手** — 一键创建应用、交互式登录授权，从安装到第一次 API 调用只需三步
@@ -30,11 +30,13 @@
 | 📁 云空间   | 上传和下载文件、搜索文档与知识库、管理评论                      |
 | 📊 多维表格 | 创建和管理数据表、字段、记录、视图、仪表盘、自动化流程、表单、角色权限，数据聚合分析 |
 | 📈 电子表格 | 创建、读取、写入、追加、查找和导出表格数据                      |
+| 🖼️ 幻灯片   | 创建和管理演示文稿、读取演示文稿内容，以及新增或删除幻灯片页面 |
 | ✅ 任务     | 创建、查询、更新和完成任务；管理任务清单、子任务、评论与提醒             |
 | 📚 知识库   | 创建和管理知识空间、节点和文档                            |
 | 👤 通讯录   | 按姓名/邮箱/手机号搜索用户、获取用户信息                      |
 | 📧 邮箱     | 浏览、搜索、阅读邮件，发送、回复、转发邮件，管理草稿，监听新邮件           |
 | 🎥 视频会议 | 搜索会议记录、查询会议纪要与录制                           |
+| 🕐 考勤打卡 | 查询个人考勤打卡记录                                |
 | ✍️ 审批     | 查询审批任务、同意/拒绝/转交审批任务、撤回与抄送审批实例              |
 
 ## 安装与快速开始
@@ -137,6 +139,7 @@ lark-cli auth status
 | `lark-doc`                      | 创建、读取、更新、搜索文档（基于 Markdown）                |
 | `lark-drive`                    | 上传、下载文件，管理权限与评论                           |
 | `lark-sheets`                   | 创建、读取、写入、追加、查找、导出电子表格                     |
+| `lark-slides`                   | 创建和管理演示文稿、读取演示文稿内容，以及新增或删除幻灯片页面 |
 | `lark-base`                     | 多维表格、字段、记录、视图、仪表盘、数据聚合分析                  |
 | `lark-task`                     | 任务、任务清单、子任务、提醒、成员分配                       |
 | `lark-mail`                     | 浏览、搜索、阅读邮件，发送、回复、转发，草稿管理，监听新邮件            |
@@ -148,6 +151,7 @@ lark-cli auth status
 | `lark-minutes`                  | 妙记元数据与 AI 产物（总结、待办、章节）                    |
 | `lark-openapi-explorer`         | 从官方文档探索底层 API                             |
 | `lark-skill-maker`              | 自定义 skill 创建框架                            |
+| `lark-attendance`               | 查询个人考勤打卡记录                                |
 | `lark-approval`                 | 审批任务查询、同意/拒绝/转交审批任务、撤回与抄送审批实例             |
 | `lark-workflow-meeting-summary` | 工作流：会议纪要汇总与结构化报告                          |
 | `lark-workflow-standup-report`  | 工作流：日程待办摘要                                |

cmd/api/api.go

@@ -5,7 +5,6 @@ package api
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"io"
 	"regexp"
@@ -42,17 +41,7 @@ type APIOptions struct {
 	Format    string
 	JqExpr    string
 	DryRun    bool
-}
-
-func parseJsonOpt(input, label string) (map[string]interface{}, error) {
-	if input == "" {
-		return nil, nil
-	}
-	var result map[string]interface{}
-	if err := json.Unmarshal([]byte(input), &result); err != nil {
-		return nil, output.ErrValidation("%s invalid format, expected JSON object", label)
-	}
-	return result, nil
+	File      string
 }
 
 var urlPrefixRe = regexp.MustCompile(`https?://[^/]+(/open-apis/.+)`)
@@ -88,8 +77,8 @@ func NewCmdApi(f *cmdutil.Factory, runF func(*APIOptions) error) *cobra.Command
 		},
 	}
 
-	cmd.Flags().StringVar(&opts.Params, "params", "", "query parameters JSON")
-	cmd.Flags().StringVar(&opts.Data, "data", "", "request body JSON")
+	cmd.Flags().StringVar(&opts.Params, "params", "", "query parameters JSON (supports - for stdin)")
+	cmd.Flags().StringVar(&opts.Data, "data", "", "request body JSON (supports - for stdin)")
 	cmd.Flags().StringVar(&asStr, "as", "auto", "identity type: user | bot | auto (default)")
 	cmd.Flags().StringVarP(&opts.Output, "output", "o", "", "output file path for binary responses")
 	cmd.Flags().BoolVar(&opts.PageAll, "page-all", false, "automatically paginate through all pages")
@@ -99,6 +88,7 @@ func NewCmdApi(f *cmdutil.Factory, runF func(*APIOptions) error) *cobra.Command
 	cmd.Flags().StringVar(&opts.Format, "format", "json", "output format: json|ndjson|table|csv")
 	cmd.Flags().StringVarP(&opts.JqExpr, "jq", "q", "", "jq expression to filter JSON output")
 	cmd.Flags().BoolVar(&opts.DryRun, "dry-run", false, "print request without executing")
+	cmd.Flags().StringVar(&opts.File, "file", "", "file to upload as multipart/form-data ([field=]path, supports - for stdin)")
 
 	cmd.ValidArgsFunction = func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
 		if len(args) == 0 {
@@ -117,20 +107,24 @@ func NewCmdApi(f *cmdutil.Factory, runF func(*APIOptions) error) *cobra.Command
 }
 
 // buildAPIRequest validates flags and builds a RawApiRequest.
-func buildAPIRequest(opts *APIOptions) (client.RawApiRequest, error) {
-	params, err := parseJsonOpt(opts.Params, "--params")
+// When dryRun is true and a file is provided, file reading is skipped and
+// FileUploadMeta is returned instead so the caller can render dry-run output.
+func buildAPIRequest(opts *APIOptions) (client.RawApiRequest, *cmdutil.FileUploadMeta, error) {
+	stdin := opts.Factory.IOStreams.In
+
+	// Validate --file mutual exclusions first.
+	if err := cmdutil.ValidateFileFlag(opts.File, opts.Params, opts.Data, opts.Output, opts.PageAll, opts.Method); err != nil {
+		return client.RawApiRequest{}, nil, err
+	}
+
+	// stdin conflict: --params and --data cannot both read from stdin, regardless of --file.
+	if opts.Params == "-" && opts.Data == "-" {
+		return client.RawApiRequest{}, nil, output.ErrValidation("--params and --data cannot both read from stdin (-)")
+	}
+
+	params, err := cmdutil.ParseJSONMap(opts.Params, "--params", stdin)
 	if err != nil {
-		return client.RawApiRequest{}, err
-	}
-	if params == nil {
-		params = map[string]interface{}{}
-	}
-	var data interface{}
-	if opts.Data != "" {
-		data, err = parseJsonOpt(opts.Data, "--data")
-		if err != nil {
-			return client.RawApiRequest{}, err
-		}
+		return client.RawApiRequest{}, nil, err
 	}
 	if opts.PageSize > 0 {
 		params["page_size"] = opts.PageSize
@@ -140,14 +134,53 @@ func buildAPIRequest(opts *APIOptions) (client.RawApiRequest, error) {
 		Method: opts.Method,
 		URL:    normalisePath(opts.Path),
 		Params: params,
-		Data:   data,
 		As:     opts.As,
 	}
-	// WithFileDownload tells the SDK to skip CodeError parsing on 200 OK.
-	if opts.Output != "" {
-		request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileDownload())
+
+	if opts.File != "" {
+		// File upload path: build formdata.
+		fieldName, filePath, isStdin := cmdutil.ParseFileFlag(opts.File, "file")
+
+		// Parse --data as JSON map for form fields (not as body).
+		var dataFields any
+		if opts.Data != "" {
+			dataFields, err = cmdutil.ParseOptionalBody(opts.Method, opts.Data, stdin)
+			if err != nil {
+				return client.RawApiRequest{}, nil, err
+			}
+			if _, ok := dataFields.(map[string]any); !ok {
+				return client.RawApiRequest{}, nil, output.ErrValidation("--data must be a JSON object when used with --file")
+			}
+		}
+
+		if opts.DryRun {
+			return request, &cmdutil.FileUploadMeta{
+				FieldName: fieldName, FilePath: filePath, FormFields: dataFields,
+			}, nil
+		}
+
+		fd, err := cmdutil.BuildFormdata(
+			opts.Factory.ResolveFileIO(opts.Ctx),
+			fieldName, filePath, isStdin, stdin, dataFields,
+		)
+		if err != nil {
+			return client.RawApiRequest{}, nil, err
+		}
+		request.Data = fd
+		request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileUpload())
+	} else {
+		// Normal path: JSON body.
+		data, err := cmdutil.ParseOptionalBody(opts.Method, opts.Data, stdin)
+		if err != nil {
+			return client.RawApiRequest{}, nil, err
+		}
+		request.Data = data
+		if opts.Output != "" {
+			request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileDownload())
+		}
 	}
-	return request, nil
+
+	return request, nil, nil
 }
 
 func apiRun(opts *APIOptions) error {
@@ -165,7 +198,7 @@ func apiRun(opts *APIOptions) error {
 		return err
 	}
 
-	request, err := buildAPIRequest(opts)
+	request, fileMeta, err := buildAPIRequest(opts)
 	if err != nil {
 		return err
 	}
@@ -176,6 +209,9 @@ func apiRun(opts *APIOptions) error {
 	}
 
 	if opts.DryRun {
+		if fileMeta != nil {
+			return cmdutil.PrintDryRunWithFile(f.IOStreams.Out, request, config, opts.Format, fileMeta.FieldName, fileMeta.FilePath, fileMeta.FormFields)
+		}
 		return apiDryRun(f, request, config, opts.Format)
 	}
 	// Identity info is now included in the JSON envelope; skip stderr printing.
@@ -199,7 +235,7 @@ func apiRun(opts *APIOptions) error {
 
 	resp, err := ac.DoAPI(opts.Ctx, request)
 	if err != nil {
-		return output.MarkRaw(output.ErrNetwork("API call failed: %v", err))
+		return output.MarkRaw(client.WrapDoAPIError(err))
 	}
 	err = client.HandleResponse(resp, client.ResponseOptions{
 		OutputPath: opts.Output,
@@ -207,6 +243,7 @@ func apiRun(opts *APIOptions) error {
 		JqExpr:     opts.JqExpr,
 		Out:        out,
 		ErrOut:     f.IOStreams.ErrOut,
+		FileIO:     f.ResolveFileIO(opts.Ctx),
 	})
 	// MarkRaw tells root error handler to skip enrichPermissionError,
 	// preserving the original API error detail (log_id, troubleshooter, etc.).

cmd/api/api_test.go

@@ -5,6 +5,7 @@ package api
 
 import (
 	"errors"
+	"os"
 	"sort"
 	"strings"
 	"testing"
@@ -199,6 +200,22 @@ func TestApiCmd_PageLimitDefault(t *testing.T) {
 	}
 }
 
+func TestApiCmd_ParamsAndDataBothStdinConflict(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+
+	cmd := NewCmdApi(f, nil)
+	cmd.SetArgs([]string{"POST", "/open-apis/test", "--as", "bot", "--params", "-", "--data", "-"})
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error when both --params and --data use stdin")
+	}
+	if !strings.Contains(err.Error(), "cannot both read from stdin") {
+		t.Errorf("expected stdin conflict error, got: %v", err)
+	}
+}
+
 func TestApiCmd_OutputAndPageAllConflict(t *testing.T) {
 	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
 		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
@@ -446,6 +463,43 @@ func TestApiCmd_APIError_PreservesOriginalMessage(t *testing.T) {
 	}
 }
 
+func TestApiCmd_InvalidJSONResponse_ShowsDiagnostic(t *testing.T) {
+	f, _, _, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app-invalidjson", AppSecret: "test-secret-invalidjson", Brand: core.BrandFeishu,
+	})
+
+	reg.Register(&httpmock.Stub{
+		URL:         "/open-apis/test/invalidjson",
+		RawBody:     []byte{},
+		ContentType: "application/json",
+	})
+
+	cmd := NewCmdApi(f, nil)
+	cmd.SetArgs([]string{"GET", "/open-apis/test/invalidjson", "--as", "bot"})
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error")
+	}
+
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected *output.ExitError, got %T", err)
+	}
+	if exitErr.Code != output.ExitAPI {
+		t.Fatalf("expected ExitAPI, got %d", exitErr.Code)
+	}
+	if exitErr.Detail == nil {
+		t.Fatal("expected detail on exit error")
+	}
+	if !strings.Contains(exitErr.Detail.Message, "invalid JSON response") &&
+		!strings.Contains(exitErr.Detail.Message, "empty JSON response body") {
+		t.Fatalf("expected JSON diagnostic, got %q", exitErr.Detail.Message)
+	}
+	if !strings.Contains(exitErr.Detail.Hint, "--output") {
+		t.Fatalf("expected hint to mention --output, got %q", exitErr.Detail.Hint)
+	}
+}
+
 func TestApiCmd_PageAll_APIError_IsRaw(t *testing.T) {
 	f, _, _, reg := cmdutil.TestFactory(t, &core.CliConfig{
 		AppID: "test-app-rawpage", AppSecret: "test-secret-rawpage", Brand: core.BrandFeishu,
@@ -653,3 +707,98 @@ func TestApiCmd_MethodUppercase(t *testing.T) {
 		t.Errorf("expected method POST (uppercased), got %s", gotOpts.Method)
 	}
 }
+
+func TestApiCmd_FileFlagParsing(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+	var gotOpts *APIOptions
+	cmd := NewCmdApi(f, func(opts *APIOptions) error {
+		gotOpts = opts
+		return nil
+	})
+	cmd.SetArgs([]string{"POST", "/open-apis/test", "--file", "image=photo.jpg", "--data", `{"image_type":"message"}`})
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if gotOpts.File != "image=photo.jpg" {
+		t.Errorf("expected File = %q, got %q", "image=photo.jpg", gotOpts.File)
+	}
+}
+
+func TestApiCmd_FileAndOutputConflict(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+	cmd := NewCmdApi(f, func(opts *APIOptions) error {
+		return apiRun(opts)
+	})
+	cmd.SetArgs([]string{"POST", "/open-apis/test", "--as", "bot", "--file", "photo.jpg", "--output", "out.json"})
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error for --file with --output")
+	}
+	if !strings.Contains(err.Error(), "mutually exclusive") {
+		t.Errorf("expected mutual exclusion error, got: %v", err)
+	}
+}
+
+func TestApiCmd_FileWithGET(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+	cmd := NewCmdApi(f, func(opts *APIOptions) error {
+		return apiRun(opts)
+	})
+	cmd.SetArgs([]string{"GET", "/open-apis/test", "--as", "bot", "--file", "photo.jpg"})
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error for --file with GET")
+	}
+	if !strings.Contains(err.Error(), "requires POST") {
+		t.Errorf("expected method error, got: %v", err)
+	}
+}
+
+func TestApiCmd_FileStdinConflictWithData(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+	cmd := NewCmdApi(f, func(opts *APIOptions) error {
+		return apiRun(opts)
+	})
+	cmd.SetArgs([]string{"POST", "/open-apis/test", "--as", "bot", "--file", "-", "--data", "-"})
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error for --file stdin with --data stdin")
+	}
+	if !strings.Contains(err.Error(), "cannot both read from stdin") {
+		t.Errorf("expected stdin conflict error, got: %v", err)
+	}
+}
+
+func TestApiCmd_DryRunWithFile(t *testing.T) {
+	tmpDir := t.TempDir()
+	tmpFile := tmpDir + "/test.jpg"
+	if err := os.WriteFile(tmpFile, []byte("fake-image"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	f, stdout, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+	cmd := NewCmdApi(f, nil)
+	cmd.SetArgs([]string{"POST", "/open-apis/im/v1/images", "--file", "image=" + tmpFile, "--data", `{"image_type":"message"}`, "--dry-run", "--as", "bot"})
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, "image") {
+		t.Errorf("expected dry-run output to mention file field, got: %s", out)
+	}
+	if !strings.Contains(out, "Dry Run") {
+		t.Errorf("expected dry-run header, got: %s", out)
+	}
+}

cmd/auth/auth.go

@@ -16,6 +16,7 @@ import (
 
 	larkauth "github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/core"
 )
 
 // NewCmdAuth creates the auth command with subcommands.
@@ -100,7 +101,7 @@ type appInfoResponse struct {
 
 // getAppInfo queries app info from the Lark API.
 func getAppInfo(ctx context.Context, f *cmdutil.Factory, appId string) (*appInfo, error) {
-	sdk, err := f.LarkClient()
+	ac, err := f.NewAPIClient()
 	if err != nil {
 		return nil, err
 	}
@@ -108,12 +109,11 @@ func getAppInfo(ctx context.Context, f *cmdutil.Factory, appId string) (*appInfo
 	queryParams := make(larkcore.QueryParams)
 	queryParams.Set("lang", "zh_cn")
 
-	apiResp, err := sdk.Do(ctx, &larkcore.ApiReq{
-		HttpMethod:                http.MethodGet,
-		ApiPath:                   larkauth.ApplicationInfoPath(appId),
-		QueryParams:               queryParams,
-		SupportedAccessTokenTypes: []larkcore.AccessTokenType{larkcore.AccessTokenTypeTenant},
-	})
+	apiResp, err := ac.DoSDKRequest(ctx, &larkcore.ApiReq{
+		HttpMethod:  http.MethodGet,
+		ApiPath:     larkauth.ApplicationInfoPath(appId),
+		QueryParams: queryParams,
+	}, core.AsBot)
 	if err != nil {
 		return nil, err
 	}

cmd/auth/auth_test.go

@@ -4,12 +4,16 @@
 package auth
 
 import (
+	"context"
+	"net/http"
 	"sort"
 	"strings"
 	"testing"
 
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/core"
+	"github.com/larksuite/cli/internal/credential"
+	"github.com/larksuite/cli/internal/httpmock"
 	"github.com/larksuite/cli/internal/registry"
 )
 
@@ -231,3 +235,71 @@ func TestAuthScopesCmd_FlagParsing(t *testing.T) {
 		t.Errorf("expected format json, got %s", gotOpts.Format)
 	}
 }
+
+func TestAuthScopesRun_UsesTenantAccessTokenFromCredentialProvider(t *testing.T) {
+	f, _, _, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "", Brand: core.BrandFeishu,
+	})
+	tokenResolver := &authScopesTokenResolver{}
+	f.Credential = credential.NewCredentialProvider(nil, nil, tokenResolver, nil)
+
+	appInfoStub := &httpmock.Stub{
+		Method: http.MethodGet,
+		URL:    "/open-apis/application/v6/applications/test-app",
+		Body: map[string]interface{}{
+			"code": 0,
+			"msg":  "ok",
+			"data": map[string]interface{}{
+				"app": map[string]interface{}{
+					"creator_id": "ou_creator",
+					"scopes": []map[string]interface{}{
+						{
+							"scope":       "im:message",
+							"token_types": []string{"tenant"},
+						},
+						{
+							"scope":       "im:message:send_as_user",
+							"token_types": []string{"user"},
+						},
+					},
+				},
+			},
+		},
+	}
+	reg.Register(appInfoStub)
+
+	err := authScopesRun(&ScopesOptions{
+		Factory: f,
+		Ctx:     context.Background(),
+		Format:  "json",
+	})
+	if err != nil {
+		t.Fatalf("authScopesRun() error = %v", err)
+	}
+
+	if len(tokenResolver.requests) != 1 {
+		t.Fatalf("resolved token requests = %v, want exactly one request", tokenResolver.requests)
+	}
+	if got := tokenResolver.requests[0].Type; got != credential.TokenTypeTAT {
+		t.Fatalf("resolved token type = %q, want %q", got, credential.TokenTypeTAT)
+	}
+	if got := appInfoStub.CapturedHeaders.Get("Authorization"); got != "Bearer tenant-token" {
+		t.Fatalf("Authorization header = %q, want %q", got, "Bearer tenant-token")
+	}
+}
+
+type authScopesTokenResolver struct {
+	requests []credential.TokenSpec
+}
+
+func (r *authScopesTokenResolver) ResolveToken(ctx context.Context, req credential.TokenSpec) (*credential.TokenResult, error) {
+	r.requests = append(r.requests, req)
+	switch req.Type {
+	case credential.TokenTypeTAT:
+		return &credential.TokenResult{Token: "tenant-token"}, nil
+	case credential.TokenTypeUAT:
+		return &credential.TokenResult{Token: "user-token"}, nil
+	default:
+		return &credential.TokenResult{Token: "unexpected-token"}, nil
+	}
+}

cmd/auth/login.go

@@ -34,6 +34,8 @@ type LoginOptions struct {
 	DeviceCode string
 }
 
+var pollDeviceToken = larkauth.PollDeviceToken
+
 // NewCmdAuthLogin creates the auth login subcommand.
 func NewCmdAuthLogin(f *cmdutil.Factory, runF func(*LoginOptions) error) *cobra.Command {
 	opts := &LoginOptions{Factory: f}
@@ -132,18 +134,7 @@ func authLoginRun(opts *LoginOptions) error {
 	// Expand --domain all to all available domains (from_meta projects + shortcut services)
 	for _, d := range selectedDomains {
 		if strings.EqualFold(d, "all") {
-			domainSet := make(map[string]bool)
-			for _, p := range registry.ListFromMetaProjects() {
-				domainSet[p] = true
-			}
-			for _, sc := range shortcuts.AllShortcuts() {
-				domainSet[sc.Service] = true
-			}
-			selectedDomains = make([]string, 0, len(domainSet))
-			for d := range domainSet {
-				selectedDomains = append(selectedDomains, d)
-			}
-			sort.Strings(selectedDomains)
+			selectedDomains = sortedKnownDomains()
 			break
 		}
 	}
@@ -235,6 +226,9 @@ func authLoginRun(opts *LoginOptions) error {
 
 	// --no-wait: return immediately with device code and URL
 	if opts.NoWait {
+		if err := saveLoginRequestedScope(authResp.DeviceCode, finalScope); err != nil {
+			fmt.Fprintf(f.IOStreams.ErrOut, "[lark-cli] [WARN] auth login: failed to cache requested scopes: %v\n", err)
+		}
 		data := map[string]interface{}{
 			"verification_url": authResp.VerificationUriComplete,
 			"device_code":      authResp.DeviceCode,
@@ -244,7 +238,7 @@ func authLoginRun(opts *LoginOptions) error {
 		encoder := json.NewEncoder(f.IOStreams.Out)
 		encoder.SetEscapeHTML(false)
 		if err := encoder.Encode(data); err != nil {
-			fmt.Fprintf(f.IOStreams.ErrOut, "error: failed to write JSON output: %v\n", err)
+			return output.Errorf(output.ExitInternal, "internal", "failed to write JSON output: %v", err)
 		}
 		return nil
 	}
@@ -261,7 +255,7 @@ func authLoginRun(opts *LoginOptions) error {
 		encoder := json.NewEncoder(f.IOStreams.Out)
 		encoder.SetEscapeHTML(false)
 		if err := encoder.Encode(data); err != nil {
-			fmt.Fprintf(f.IOStreams.ErrOut, "error: failed to write JSON output: %v\n", err)
+			return output.Errorf(output.ExitInternal, "internal", "failed to write JSON output: %v", err)
 		}
 	} else {
 		fmt.Fprintf(f.IOStreams.ErrOut, msg.OpenURL)
@@ -270,20 +264,26 @@ func authLoginRun(opts *LoginOptions) error {
 
 	// Step 3: Poll for token
 	log(msg.WaitingAuth)
-	result := larkauth.PollDeviceToken(opts.Ctx, httpClient, config.AppID, config.AppSecret, config.Brand,
+	result := pollDeviceToken(opts.Ctx, httpClient, config.AppID, config.AppSecret, config.Brand,
 		authResp.DeviceCode, authResp.Interval, authResp.ExpiresIn, f.IOStreams.ErrOut)
 
 	if !result.OK {
 		if opts.JSON {
-			b, _ := json.Marshal(map[string]interface{}{
+			encoder := json.NewEncoder(f.IOStreams.Out)
+			encoder.SetEscapeHTML(false)
+			if err := encoder.Encode(map[string]interface{}{
 				"event": "authorization_failed",
 				"error": result.Message,
-			})
-			fmt.Fprintln(f.IOStreams.Out, string(b))
+			}); err != nil {
+				return output.Errorf(output.ExitInternal, "internal", "failed to write JSON output: %v", err)
+			}
 			return output.ErrBare(output.ExitAuth)
 		}
 		return output.ErrAuth("authorization failed: %s", result.Message)
 	}
+	if result.Token == nil {
+		return output.ErrAuth("authorization succeeded but no token returned")
+	}
 
 	// Step 6: Get user info
 	log(msg.AuthSuccess)
@@ -296,6 +296,8 @@ func authLoginRun(opts *LoginOptions) error {
 		return output.ErrAuth("failed to get user info: %v", err)
 	}
 
+	scopeSummary := loadLoginScopeSummary(config.AppID, openId, finalScope, result.Token.Scope)
+
 	// Step 7: Store token
 	now := time.Now().UnixMilli()
 	storedToken := &larkauth.StoredUAToken{
@@ -318,21 +320,11 @@ func authLoginRun(opts *LoginOptions) error {
 		return output.Errorf(output.ExitInternal, "internal", "failed to update login profile: %v", err)
 	}
 
-	if opts.JSON {
-		b, _ := json.Marshal(map[string]interface{}{
-			"event":        "authorization_complete",
-			"user_open_id": openId,
-			"user_name":    userName,
-			"scope":        result.Token.Scope,
-		})
-		fmt.Fprintln(f.IOStreams.Out, string(b))
-	} else {
-		fmt.Fprintln(f.IOStreams.ErrOut)
-		output.PrintSuccess(f.IOStreams.ErrOut, fmt.Sprintf(msg.LoginSuccess, userName, openId))
-		if result.Token.Scope != "" {
-			fmt.Fprintf(f.IOStreams.ErrOut, msg.GrantedScopes, result.Token.Scope)
-		}
+	if issue := ensureRequestedScopesGranted(finalScope, result.Token.Scope, msg, scopeSummary); issue != nil {
+		return handleLoginScopeIssue(opts, msg, f, issue, openId, userName)
 	}
+
+	writeLoginSuccess(opts, msg, f, openId, userName, scopeSummary)
 	return nil
 }
 
@@ -345,13 +337,26 @@ func authLoginPollDeviceCode(opts *LoginOptions, config *core.CliConfig, msg *lo
 	if err != nil {
 		return err
 	}
+	requestedScope, err := loadLoginRequestedScope(opts.DeviceCode)
+	if err != nil {
+		fmt.Fprintf(f.IOStreams.ErrOut, "[lark-cli] [WARN] auth login: failed to load cached requested scopes: %v\n", err)
+	}
+	cleanupRequestedScope := func() {
+		if err := removeLoginRequestedScope(opts.DeviceCode); err != nil {
+			fmt.Fprintf(f.IOStreams.ErrOut, "[lark-cli] [WARN] auth login: failed to remove cached requested scopes: %v\n", err)
+		}
+	}
 	log(msg.WaitingAuth)
-	result := larkauth.PollDeviceToken(opts.Ctx, httpClient, config.AppID, config.AppSecret, config.Brand,
+	result := pollDeviceToken(opts.Ctx, httpClient, config.AppID, config.AppSecret, config.Brand,
 		opts.DeviceCode, 5, 180, f.IOStreams.ErrOut)
 
 	if !result.OK {
+		if shouldRemoveLoginRequestedScope(result) {
+			cleanupRequestedScope()
+		}
 		return output.ErrAuth("authorization failed: %s", result.Message)
 	}
+	defer cleanupRequestedScope()
 	if result.Token == nil {
 		return output.ErrAuth("authorization succeeded but no token returned")
 	}
@@ -367,6 +372,8 @@ func authLoginPollDeviceCode(opts *LoginOptions, config *core.CliConfig, msg *lo
 		return output.ErrAuth("failed to get user info: %v", err)
 	}
 
+	scopeSummary := loadLoginScopeSummary(config.AppID, openId, requestedScope, result.Token.Scope)
+
 	// Store token
 	now := time.Now().UnixMilli()
 	storedToken := &larkauth.StoredUAToken{
@@ -389,7 +396,11 @@ func authLoginPollDeviceCode(opts *LoginOptions, config *core.CliConfig, msg *lo
 		return output.Errorf(output.ExitInternal, "internal", "failed to update login profile: %v", err)
 	}
 
-	output.PrintSuccess(f.IOStreams.ErrOut, fmt.Sprintf(msg.LoginSuccess, userName, openId))
+	if issue := ensureRequestedScopesGranted(requestedScope, result.Token.Scope, msg, scopeSummary); issue != nil {
+		return handleLoginScopeIssue(opts, msg, f, issue, openId, userName)
+	}
+
+	writeLoginSuccess(opts, msg, f, openId, userName, scopeSummary)
 	return nil
 }
 
@@ -429,6 +440,8 @@ func findProfileByName(multi *core.MultiAppConfig, profileName string) *core.App
 
 // collectScopesForDomains collects API scopes (from from_meta projects) and
 // shortcut scopes for the given domain names.
+// Domains with auth_domain children are automatically expanded to include
+// their children's scopes.
 func collectScopesForDomains(domains []string, identity string) []string {
 	scopeSet := make(map[string]bool)
 
@@ -437,11 +450,16 @@ func collectScopesForDomains(domains []string, identity string) []string {
 		scopeSet[s] = true
 	}
 
-	// 2. Shortcut scopes matching by Service (only include shortcuts supporting the identity)
+	// 2. Expand domains: include auth_domain children
 	domainSet := make(map[string]bool, len(domains))
 	for _, d := range domains {
 		domainSet[d] = true
+		for _, child := range registry.GetAuthChildren(d) {
+			domainSet[child] = true
+		}
 	}
+
+	// 3. Shortcut scopes matching by Service (only include shortcuts supporting the identity)
 	for _, sc := range shortcuts.AllShortcuts() {
 		if domainSet[sc.Service] && shortcutSupportsIdentity(sc, identity) {
 			for _, s := range sc.ScopesForIdentity(identity) {
@@ -450,7 +468,7 @@ func collectScopesForDomains(domains []string, identity string) []string {
 		}
 	}
 
-	// 3. Deduplicate and sort
+	// 4. Deduplicate and sort
 	result := make([]string, 0, len(scopeSet))
 	for s := range scopeSet {
 		result = append(result, s)
@@ -459,14 +477,20 @@ func collectScopesForDomains(domains []string, identity string) []string {
 	return result
 }
 
-// allKnownDomains returns all valid domain names (from_meta projects + shortcut services).
+// allKnownDomains returns all valid auth domain names (from_meta projects +
+// shortcut services), excluding domains that have auth_domain set (they are
+// folded into their parent domain).
 func allKnownDomains() map[string]bool {
 	domains := make(map[string]bool)
 	for _, p := range registry.ListFromMetaProjects() {
-		domains[p] = true
+		if !registry.HasAuthDomain(p) {
+			domains[p] = true
+		}
 	}
 	for _, sc := range shortcuts.AllShortcuts() {
-		domains[sc.Service] = true
+		if !registry.HasAuthDomain(sc.Service) {
+			domains[sc.Service] = true
+		}
 	}
 	return domains
 }

cmd/auth/login_interactive.go

@@ -34,8 +34,12 @@ func getDomainMetadata(lang string) []domainMeta {
 	seen := make(map[string]bool)
 	var domains []domainMeta
 
-	// 1. Domains from from_meta projects
+	// 1. Domains from from_meta projects (skip domains with auth_domain)
 	for _, project := range registry.ListFromMetaProjects() {
+		if registry.HasAuthDomain(project) {
+			seen[project] = true
+			continue
+		}
 		dm := buildDomainMeta(project, lang)
 		domains = append(domains, dm)
 		seen[project] = true
@@ -52,13 +56,14 @@ func getDomainMetadata(lang string) []domainMeta {
 	}
 
 	// 3. Auto-discover remaining shortcut services that are listed as shortcut-only domains
+	//    (skip domains with auth_domain — they are folded into their parent)
 	shortcutOnlySet := make(map[string]bool)
 	for _, n := range shortcutOnlyNames {
 		shortcutOnlySet[n] = true
 	}
 	for _, sc := range shortcuts.AllShortcuts() {
 		if !seen[sc.Service] {
-			if shortcutOnlySet[sc.Service] {
+			if shortcutOnlySet[sc.Service] && !registry.HasAuthDomain(sc.Service) {
 				dm := buildDomainMeta(sc.Service, lang)
 				domains = append(domains, dm)
 			}
@@ -179,27 +184,6 @@ func runInteractiveLogin(ios *cmdutil.IOStreams, lang string, msg *loginMsg) (*i
 	}
 	fmt.Fprintf(ios.ErrOut, msg.SummaryScopes, len(scopes), scopePreview)
 
-	// Phase 2: confirmation
-	var confirmed bool
-	form2 := huh.NewForm(
-		huh.NewGroup(
-			huh.NewConfirm().
-				Title(msg.ConfirmAuth).
-				Value(&confirmed),
-		),
-	).WithTheme(cmdutil.ThemeFeishu())
-
-	if err := form2.Run(); err != nil {
-		if err == huh.ErrUserAborted {
-			return nil, output.ErrBare(1)
-		}
-		return nil, err
-	}
-
-	if !confirmed {
-		return nil, output.ErrBare(1)
-	}
-
 	return &interactiveResult{
 		Domains:    selectedDomains,
 		ScopeLevel: permLevel,

cmd/auth/login_messages.go

@@ -20,11 +20,17 @@ type loginMsg struct {
 	ConfirmAuth     string
 
 	// Non-interactive prompts (login.go)
-	OpenURL       string
-	WaitingAuth   string
-	AuthSuccess   string
-	LoginSuccess  string
-	GrantedScopes string
+	OpenURL            string
+	WaitingAuth        string
+	AuthSuccess        string
+	LoginSuccess       string
+	ScopeMismatch      string
+	ScopeHint          string
+	RequestedScopes    string
+	NewlyGrantedScopes string
+	MissingScopes      string
+	NoScopes           string
+	StatusHint         string
 
 	// Non-interactive hint (no flags)
 	HintHeader  string
@@ -50,11 +56,17 @@ var loginMsgZh = &loginMsg{
 	ErrNoDomain:     "请至少选择一个业务域",
 	ConfirmAuth:     "确认授权?",
 
-	OpenURL:       "在浏览器中打开以下链接进行认证:\n\n",
-	WaitingAuth:   "等待用户授权...",
-	AuthSuccess:   "授权成功，正在获取用户信息...",
-	LoginSuccess:  "登录成功! 用户: %s (%s)",
-	GrantedScopes: "  已授权 scopes: %s\n",
+	OpenURL:            "在浏览器中打开以下链接进行认证:\n\n",
+	WaitingAuth:        "等待用户授权...",
+	AuthSuccess:        "授权成功，正在获取用户信息...",
+	LoginSuccess:       "登录成功! 用户: %s (%s)",
+	ScopeMismatch:      "授权完成，但以下请求 scopes 未被授予: %s",
+	ScopeHint:          "以上结果是本次授权请求用户最终确认后的结果，请勿持续重试；Scopes 未授予的原因是多样的，如 scope 被禁用；具体原因已通过授权页提示用户。可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+	RequestedScopes:    "  本次请求 scopes: %s\n",
+	NewlyGrantedScopes: "  本次新授予 scopes: %s\n",
+	MissingScopes:      "  本次未授予 scopes: %s\n",
+	NoScopes:           "（空）",
+	StatusHint:         "可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
 
 	HintHeader:  "请指定要授权的权限:\n",
 	HintCommon1: "  --recommend                     授权推荐权限",
@@ -79,11 +91,17 @@ var loginMsgEn = &loginMsg{
 	ErrNoDomain:     "please select at least one domain",
 	ConfirmAuth:     "Confirm authorization?",
 
-	OpenURL:       "Open this URL in your browser to authenticate:\n\n",
-	WaitingAuth:   "Waiting for user authorization...",
-	AuthSuccess:   "Authorization successful, fetching user info...",
-	LoginSuccess:  "Login successful! User: %s (%s)",
-	GrantedScopes: "  Granted scopes: %s\n",
+	OpenURL:            "Open this URL in your browser to authenticate:\n\n",
+	WaitingAuth:        "Waiting for user authorization...",
+	AuthSuccess:        "Authorization successful, fetching user info...",
+	LoginSuccess:       "Login successful! User: %s (%s)",
+	ScopeMismatch:      "authorization completed, but these requested scopes were not granted: %s",
+	ScopeHint:          "The result above is the user's final confirmation for this authorization request. Do not retry continuously. Scopes may be not granted for various reasons, such as a scope being disabled. The specific reason has already been shown to the user on the authorization page. Run `lark-cli auth status` to inspect all scopes currently granted to the account.",
+	RequestedScopes:    "  Requested scopes: %s\n",
+	NewlyGrantedScopes: "  Newly granted scopes: %s\n",
+	MissingScopes:      "  Not granted scopes: %s\n",
+	NoScopes:           "(none)",
+	StatusHint:         "Run `lark-cli auth status` to inspect all scopes currently granted to the account.",
 
 	HintHeader:  "Please specify the scopes to authorize:\n",
 	HintCommon1: "  --recommend                     authorize recommended scopes",

cmd/auth/login_messages_test.go

@@ -69,12 +69,6 @@ func TestLoginMsg_FormatStrings(t *testing.T) {
 			t.Errorf("%s LoginSuccess has no format verb", lang)
 		}
 
-		// GrantedScopes should contain %s
-		got = fmt.Sprintf(msg.GrantedScopes, "scope1 scope2")
-		if got == msg.GrantedScopes {
-			t.Errorf("%s GrantedScopes has no format verb", lang)
-		}
-
 		// SummaryDomains should contain %s
 		got = fmt.Sprintf(msg.SummaryDomains, "calendar, task")
 		if got == msg.SummaryDomains {

cmd/auth/login_result.go

@@ -0,0 +1,235 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	larkauth "github.com/larksuite/cli/internal/auth"
+	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/output"
+)
+
+type loginScopeSummary struct {
+	Requested      []string
+	NewlyGranted   []string
+	AlreadyGranted []string
+	Granted        []string
+	Missing        []string
+}
+
+type loginScopeIssue struct {
+	Message string
+	Hint    string
+	Summary *loginScopeSummary
+}
+
+// ensureRequestedScopesGranted checks whether all requested scopes were granted
+// and returns a structured issue when any requested scope is missing.
+func ensureRequestedScopesGranted(requestedScope, grantedScope string, msg *loginMsg, summary *loginScopeSummary) *loginScopeIssue {
+	requested := uniqueScopeList(requestedScope)
+	if len(requested) == 0 {
+		return nil
+	}
+
+	missing := larkauth.MissingScopes(grantedScope, requested)
+	if len(missing) == 0 {
+		return nil
+	}
+
+	if summary == nil {
+		summary = &loginScopeSummary{
+			Requested: requested,
+			Granted:   strings.Fields(grantedScope),
+			Missing:   missing,
+		}
+	}
+	return &loginScopeIssue{
+		Message: fmt.Sprintf(msg.ScopeMismatch, strings.Join(missing, " ")),
+		Hint:    msg.ScopeHint,
+		Summary: summary,
+	}
+}
+
+// loadLoginScopeSummary builds a scope summary by comparing the requested scopes,
+// previously stored scopes, and the newly granted scopes from the current login.
+func loadLoginScopeSummary(appID, openId, requestedScope, grantedScope string) *loginScopeSummary {
+	previousScope := ""
+	if previous := larkauth.GetStoredToken(appID, openId); previous != nil {
+		previousScope = previous.Scope
+	}
+	return buildLoginScopeSummary(requestedScope, previousScope, grantedScope)
+}
+
+// buildLoginScopeSummary classifies requested scopes into newly granted,
+// already granted, and missing buckets while preserving the final granted list.
+func buildLoginScopeSummary(requestedScope, previousScope, grantedScope string) *loginScopeSummary {
+	requested := uniqueScopeList(requestedScope)
+	previous := uniqueScopeList(previousScope)
+	granted := uniqueScopeList(grantedScope)
+	previousSet := make(map[string]bool, len(previous))
+	for _, scope := range previous {
+		previousSet[scope] = true
+	}
+	grantedSet := make(map[string]bool, len(granted))
+	for _, scope := range granted {
+		grantedSet[scope] = true
+	}
+
+	summary := &loginScopeSummary{
+		Requested: requested,
+		Granted:   granted,
+	}
+	for _, scope := range requested {
+		if !grantedSet[scope] {
+			summary.Missing = append(summary.Missing, scope)
+			continue
+		}
+		if previousSet[scope] {
+			summary.AlreadyGranted = append(summary.AlreadyGranted, scope)
+			continue
+		}
+		summary.NewlyGranted = append(summary.NewlyGranted, scope)
+	}
+	return summary
+}
+
+// uniqueScopeList splits a scope string into a de-duplicated ordered slice.
+func uniqueScopeList(scope string) []string {
+	seen := make(map[string]bool)
+	var result []string
+	for _, item := range strings.Fields(scope) {
+		if seen[item] {
+			continue
+		}
+		seen[item] = true
+		result = append(result, item)
+	}
+	return result
+}
+
+// formatScopeList joins scopes for display and falls back to the provided empty
+// label when the input slice is empty.
+func formatScopeList(scopes []string, empty string) string {
+	if len(scopes) == 0 {
+		return empty
+	}
+	return strings.Join(scopes, " ")
+}
+
+// emptyIfNil normalizes nil slices to empty slices for stable JSON output.
+func emptyIfNil(s []string) []string {
+	if s == nil {
+		return []string{}
+	}
+	return s
+}
+
+// writeLoginScopeBreakdown renders the requested/newly granted/missing scope
+// breakdown to stderr.
+func writeLoginScopeBreakdown(errOut *cmdutil.IOStreams, msg *loginMsg, summary *loginScopeSummary) {
+	if summary == nil {
+		summary = &loginScopeSummary{}
+	}
+	fmt.Fprintf(errOut.ErrOut, msg.RequestedScopes, formatScopeList(summary.Requested, msg.NoScopes))
+	fmt.Fprintf(errOut.ErrOut, msg.NewlyGrantedScopes, formatScopeList(summary.NewlyGranted, msg.NoScopes))
+	fmt.Fprintf(errOut.ErrOut, msg.MissingScopes, formatScopeList(summary.Missing, msg.NoScopes))
+}
+
+// writeLoginSuccess emits the successful login payload in either JSON or text
+// format together with the computed scope breakdown.
+func writeLoginSuccess(opts *LoginOptions, msg *loginMsg, f *cmdutil.Factory, openId, userName string, summary *loginScopeSummary) {
+	if summary == nil {
+		summary = &loginScopeSummary{}
+	}
+	if opts.JSON {
+		b, _ := json.Marshal(authorizationCompletePayload(openId, userName, summary, nil))
+		fmt.Fprintln(f.IOStreams.Out, string(b))
+		return
+	}
+
+	fmt.Fprintln(f.IOStreams.ErrOut)
+	output.PrintSuccess(f.IOStreams.ErrOut, fmt.Sprintf(msg.LoginSuccess, userName, openId))
+	writeLoginScopeBreakdown(f.IOStreams, msg, summary)
+	if len(summary.Missing) == 0 && msg.StatusHint != "" {
+		fmt.Fprintln(f.IOStreams.ErrOut, msg.StatusHint)
+	}
+}
+
+// handleLoginScopeIssue prints or returns a structured missing-scope result
+// while preserving a successful login outcome when authorization completed.
+func handleLoginScopeIssue(opts *LoginOptions, msg *loginMsg, f *cmdutil.Factory, issue *loginScopeIssue, openId, userName string) error {
+	if issue == nil {
+		return nil
+	}
+	loginSucceeded := openId != ""
+	if opts.JSON {
+		if loginSucceeded {
+			b, _ := json.Marshal(authorizationCompletePayload(openId, userName, issue.Summary, issue))
+			fmt.Fprintln(f.IOStreams.Out, string(b))
+			return nil
+		}
+		detail := map[string]interface{}{
+			"requested": issue.Summary.Requested,
+			"granted":   issue.Summary.Granted,
+			"missing":   issue.Summary.Missing,
+		}
+		return &output.ExitError{
+			Code: output.ExitAuth,
+			Detail: &output.ErrDetail{
+				Type:    "missing_scope",
+				Message: issue.Message,
+				Hint:    issue.Hint,
+				Detail:  detail,
+			},
+		}
+	}
+
+	fmt.Fprintln(f.IOStreams.ErrOut)
+	if loginSucceeded {
+		output.PrintSuccess(f.IOStreams.ErrOut, fmt.Sprintf(msg.LoginSuccess, userName, openId))
+	} else {
+		fmt.Fprintln(f.IOStreams.ErrOut, issue.Message)
+	}
+	if loginSucceeded {
+		fmt.Fprintln(f.IOStreams.ErrOut, issue.Message)
+	}
+	writeLoginScopeBreakdown(f.IOStreams, msg, issue.Summary)
+	if issue.Hint != "" {
+		fmt.Fprintln(f.IOStreams.ErrOut, issue.Hint)
+	}
+	if loginSucceeded {
+		return nil
+	}
+	return output.ErrBare(output.ExitAuth)
+}
+
+// authorizationCompletePayload builds the JSON payload for a completed login,
+// optionally attaching a warning when requested scopes are missing.
+func authorizationCompletePayload(openId, userName string, summary *loginScopeSummary, issue *loginScopeIssue) map[string]interface{} {
+	if summary == nil {
+		summary = &loginScopeSummary{}
+	}
+	payload := map[string]interface{}{
+		"event":           "authorization_complete",
+		"user_open_id":    openId,
+		"user_name":       userName,
+		"scope":           strings.Join(summary.Granted, " "),
+		"requested":       emptyIfNil(summary.Requested),
+		"newly_granted":   emptyIfNil(summary.NewlyGranted),
+		"already_granted": emptyIfNil(summary.AlreadyGranted),
+		"missing":         emptyIfNil(summary.Missing),
+		"granted":         emptyIfNil(summary.Granted),
+	}
+	if issue != nil {
+		payload["warning"] = map[string]interface{}{
+			"type":    "missing_scope",
+			"message": issue.Message,
+			"hint":    issue.Hint,
+		}
+	}
+	return payload
+}

cmd/auth/login_scope_cache.go

@@ -0,0 +1,94 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"encoding/json"
+	"errors"
+	"os"
+	"path/filepath"
+	"regexp"
+
+	larkauth "github.com/larksuite/cli/internal/auth"
+	"github.com/larksuite/cli/internal/core"
+	"github.com/larksuite/cli/internal/validate"
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+var loginScopeCacheSafeChars = regexp.MustCompile(`[^a-zA-Z0-9._-]`)
+
+type loginScopeCacheRecord struct {
+	RequestedScope string `json:"requested_scope"`
+}
+
+// loginScopeCacheDir returns the directory used to persist auth login --no-wait
+// requested scopes keyed by device_code.
+func loginScopeCacheDir() string {
+	return filepath.Join(core.GetConfigDir(), "cache", "auth_login_scopes")
+}
+
+// loginScopeCachePath returns the cache file path for a given device_code.
+func loginScopeCachePath(deviceCode string) string {
+	return filepath.Join(loginScopeCacheDir(), sanitizeLoginScopeCacheKey(deviceCode)+".json")
+}
+
+// sanitizeLoginScopeCacheKey converts a device_code into a safe filename token.
+func sanitizeLoginScopeCacheKey(deviceCode string) string {
+	sanitized := loginScopeCacheSafeChars.ReplaceAllString(deviceCode, "_")
+	if sanitized == "" {
+		return "default"
+	}
+	return sanitized
+}
+
+// saveLoginRequestedScope persists the requested scope string for a device_code.
+func saveLoginRequestedScope(deviceCode, requestedScope string) error {
+	if err := vfs.MkdirAll(loginScopeCacheDir(), 0700); err != nil {
+		return err
+	}
+	data, err := json.Marshal(loginScopeCacheRecord{RequestedScope: requestedScope})
+	if err != nil {
+		return err
+	}
+	return validate.AtomicWrite(loginScopeCachePath(deviceCode), data, 0600)
+}
+
+// loadLoginRequestedScope loads the cached requested scope string for a device_code.
+// It returns an empty string if no cache entry exists.
+func loadLoginRequestedScope(deviceCode string) (string, error) {
+	data, err := vfs.ReadFile(loginScopeCachePath(deviceCode))
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return "", nil
+		}
+		return "", err
+	}
+	var record loginScopeCacheRecord
+	if err := json.Unmarshal(data, &record); err != nil {
+		_ = vfs.Remove(loginScopeCachePath(deviceCode))
+		return "", err
+	}
+	return record.RequestedScope, nil
+}
+
+// removeLoginRequestedScope deletes the cache entry for a device_code.
+func removeLoginRequestedScope(deviceCode string) error {
+	err := vfs.Remove(loginScopeCachePath(deviceCode))
+	if errors.Is(err, os.ErrNotExist) {
+		return nil
+	}
+	return err
+}
+
+// shouldRemoveLoginRequestedScope indicates whether the requested-scope cache
+// should be removed after polling finishes.
+func shouldRemoveLoginRequestedScope(result *larkauth.DeviceFlowResult) bool {
+	if result == nil {
+		return false
+	}
+	if result.OK || result.Error == "access_denied" {
+		return true
+	}
+	return result.Error == "expired_token" && result.Message != "Polling was cancelled"
+}

cmd/auth/login_scope_cache_test.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"errors"
+	"os"
+	"testing"
+
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+func TestLoginRequestedScopeCache_RoundTrip(t *testing.T) {
+	setupLoginConfigDir(t)
+
+	deviceCode := "device/code:123"
+	requestedScope := "im:message:send im:message:reply"
+
+	if err := saveLoginRequestedScope(deviceCode, requestedScope); err != nil {
+		t.Fatalf("saveLoginRequestedScope() error = %v", err)
+	}
+	got, err := loadLoginRequestedScope(deviceCode)
+	if err != nil {
+		t.Fatalf("loadLoginRequestedScope() error = %v", err)
+	}
+	if got != requestedScope {
+		t.Fatalf("requestedScope = %q, want %q", got, requestedScope)
+	}
+	if _, err := vfs.Stat(loginScopeCachePath(deviceCode)); err != nil {
+		t.Fatalf("Stat(cachePath) error = %v", err)
+	}
+	if err := removeLoginRequestedScope(deviceCode); err != nil {
+		t.Fatalf("removeLoginRequestedScope() error = %v", err)
+	}
+	if _, err := vfs.Stat(loginScopeCachePath(deviceCode)); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("Stat(cachePath) error = %v, want not exist", err)
+	}
+}
+
+func TestLoadLoginRequestedScope_MissingReturnsEmpty(t *testing.T) {
+	setupLoginConfigDir(t)
+
+	got, err := loadLoginRequestedScope("missing-device-code")
+	if err != nil {
+		t.Fatalf("loadLoginRequestedScope() error = %v", err)
+	}
+	if got != "" {
+		t.Fatalf("requestedScope = %q, want empty", got)
+	}
+}

cmd/auth/login_strict_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package auth
 
 import (

cmd/auth/login_test.go

@@ -5,16 +5,29 @@ package auth
 
 import (
 	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
 	"sort"
 	"strings"
 	"testing"
 
+	larkauth "github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/core"
+	"github.com/larksuite/cli/internal/httpmock"
 	"github.com/larksuite/cli/internal/registry"
 	"github.com/larksuite/cli/shortcuts/common"
+	"github.com/zalando/go-keyring"
 )
 
+type failWriter struct{}
+
+func (failWriter) Write([]byte) (int, error) {
+	return 0, errors.New("write failed")
+}
+
 func TestSuggestDomain_PrefixMatch(t *testing.T) {
 	known := map[string]bool{
 		"calendar": true,
@@ -282,6 +295,606 @@ func TestAuthLoginRun_NonTerminal_NoFlags_RejectsWithHint(t *testing.T) {
 	}
 }
 
+func TestEnsureRequestedScopesGranted(t *testing.T) {
+	issue := ensureRequestedScopesGranted("im:message:send im:message:reply", "im:message:reply", getLoginMsg("en"), nil)
+	if issue == nil {
+		t.Fatal("expected missing scope issue")
+	}
+	if !strings.Contains(issue.Message, "im:message:send") {
+		t.Fatalf("message %q missing requested scope", issue.Message)
+	}
+	for _, want := range []string{"Do not retry continuously", "scope being disabled", "lark-cli auth status"} {
+		if !strings.Contains(issue.Hint, want) {
+			t.Fatalf("hint %q missing %q", issue.Hint, want)
+		}
+	}
+	if got := strings.Join(issue.Summary.Missing, " "); got != "im:message:send" {
+		t.Fatalf("Missing = %q", got)
+	}
+}
+
+func TestBuildLoginScopeSummary(t *testing.T) {
+	summary := buildLoginScopeSummary("im:message:send im:message:reply im:message:send", "im:message:reply", "im:message:send im:message:reply im:chat:read")
+	if got := strings.Join(summary.Requested, " "); got != "im:message:send im:message:reply" {
+		t.Fatalf("Requested = %q", got)
+	}
+	if got := strings.Join(summary.NewlyGranted, " "); got != "im:message:send" {
+		t.Fatalf("NewlyGranted = %q", got)
+	}
+	if got := strings.Join(summary.AlreadyGranted, " "); got != "im:message:reply" {
+		t.Fatalf("AlreadyGranted = %q", got)
+	}
+	if len(summary.Missing) != 0 {
+		t.Fatalf("Missing = %v, want empty", summary.Missing)
+	}
+	if got := strings.Join(summary.Granted, " "); got != "im:message:send im:message:reply im:chat:read" {
+		t.Fatalf("Granted = %q", got)
+	}
+}
+
+func TestWriteLoginSuccess_JSONIncludesScopeDiff(t *testing.T) {
+	f, stdout, _, _ := cmdutil.TestFactory(t, nil)
+
+	writeLoginSuccess(&LoginOptions{JSON: true}, getLoginMsg("en"), f, "ou_user", "tester", &loginScopeSummary{
+		Requested:      []string{"im:message:send", "im:message:reply"},
+		NewlyGranted:   []string{"im:message:send"},
+		AlreadyGranted: []string{"im:message:reply"},
+		Granted:        []string{"im:message:send", "im:message:reply"},
+	})
+
+	var data map[string]interface{}
+	if err := json.Unmarshal(stdout.Bytes(), &data); err != nil {
+		t.Fatalf("Unmarshal(stdout) error = %v, stdout=%s", err, stdout.String())
+	}
+	if data["event"] != "authorization_complete" {
+		t.Fatalf("event = %v", data["event"])
+	}
+	if data["scope"] != "im:message:send im:message:reply" {
+		t.Fatalf("scope = %v", data["scope"])
+	}
+	if len(data["newly_granted"].([]interface{})) != 1 {
+		t.Fatalf("newly_granted = %#v", data["newly_granted"])
+	}
+	if len(data["already_granted"].([]interface{})) != 1 {
+		t.Fatalf("already_granted = %#v", data["already_granted"])
+	}
+}
+
+func TestHandleLoginScopeIssue_NonJSONAlignsWithLoginSuccess(t *testing.T) {
+	f, _, stderr, _ := cmdutil.TestFactory(t, nil)
+	err := handleLoginScopeIssue(&LoginOptions{}, getLoginMsg("zh"), f, &loginScopeIssue{
+		Message: "授权完成，但以下请求 scopes 未被授予: im:message:send",
+		Hint:    "以上结果是本次授权请求用户最终确认后的结果，请勿持续重试；Scopes 未授予的原因是多样的，如 scope 被禁用；具体原因已通过授权页提示用户。可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+		Summary: &loginScopeSummary{
+			Requested: []string{"im:message:send"},
+			Missing:   []string{"im:message:send"},
+			Granted:   []string{"base:app:copy"},
+		},
+	}, "ou_user", "tester")
+	if err != nil {
+		t.Fatalf("expected nil error, got %v", err)
+	}
+	got := stderr.String()
+	for _, want := range []string{
+		"OK: 登录成功! 用户: tester (ou_user)",
+		"授权完成，但以下请求 scopes 未被授予: im:message:send",
+		"本次请求 scopes: im:message:send",
+		"本次新授予 scopes: （空）",
+		"本次未授予 scopes: im:message:send",
+		"以上结果是本次授权请求用户最终确认后的结果，请勿持续重试",
+		"scope 被禁用",
+		"lark-cli auth status",
+	} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("stderr missing %q, got:\n%s", want, got)
+		}
+	}
+	if strings.Contains(got, "最终已授权 scopes:") {
+		t.Fatalf("stderr should not contain final granted scopes, got:\n%s", got)
+	}
+	if strings.Contains(got, "ERROR:") {
+		t.Fatalf("stderr should not contain error prefix, got:\n%s", got)
+	}
+}
+
+func TestHandleLoginScopeIssue_JSONAlignsWithLoginSuccess(t *testing.T) {
+	f, stdout, _, _ := cmdutil.TestFactory(t, nil)
+	err := handleLoginScopeIssue(&LoginOptions{JSON: true}, getLoginMsg("en"), f, &loginScopeIssue{
+		Message: "authorization completed, but these requested scopes were not granted: im:message:send",
+		Hint:    "Granted scopes: base:app:copy. Check app scopes.",
+		Summary: &loginScopeSummary{
+			Requested: []string{"im:message:send"},
+			Missing:   []string{"im:message:send"},
+			Granted:   []string{"base:app:copy"},
+		},
+	}, "ou_user", "tester")
+	if err != nil {
+		t.Fatalf("expected nil error, got %v", err)
+	}
+
+	var data map[string]interface{}
+	if err := json.Unmarshal(stdout.Bytes(), &data); err != nil {
+		t.Fatalf("Unmarshal(stdout) error = %v, stdout=%s", err, stdout.String())
+	}
+	if data["event"] != "authorization_complete" {
+		t.Fatalf("event = %v", data["event"])
+	}
+	if data["user_open_id"] != "ou_user" {
+		t.Fatalf("user_open_id = %v", data["user_open_id"])
+	}
+	warning, ok := data["warning"].(map[string]interface{})
+	if !ok {
+		t.Fatalf("warning = %#v", data["warning"])
+	}
+	if warning["type"] != "missing_scope" {
+		t.Fatalf("warning.type = %v", warning["type"])
+	}
+}
+
+func TestWriteLoginSuccess_JSONEmptySlicesNotNull(t *testing.T) {
+	f, stdout, _, _ := cmdutil.TestFactory(t, nil)
+
+	writeLoginSuccess(&LoginOptions{JSON: true}, getLoginMsg("en"), f, "ou_user", "tester", &loginScopeSummary{
+		Granted: []string{"offline_access"},
+	})
+
+	var data map[string]interface{}
+	if err := json.Unmarshal(stdout.Bytes(), &data); err != nil {
+		t.Fatalf("Unmarshal(stdout) error = %v, stdout=%s", err, stdout.String())
+	}
+	for _, k := range []string{"requested", "newly_granted", "already_granted", "missing", "granted"} {
+		v, ok := data[k]
+		if !ok {
+			t.Fatalf("missing key %q in payload: %v", k, data)
+		}
+		if _, ok := v.([]interface{}); !ok {
+			t.Fatalf("%s = %#v, want JSON array", k, v)
+		}
+	}
+}
+
+func TestWriteLoginSuccess_TextOutputScenarios(t *testing.T) {
+	tests := []struct {
+		name            string
+		summary         *loginScopeSummary
+		expectedPresent []string
+		expectedAbsent  []string
+	}{
+		{
+			name: "mixed newly granted and already granted",
+			summary: &loginScopeSummary{
+				Requested:      []string{"im:message:send", "im:message:reply"},
+				NewlyGranted:   []string{"im:message:send"},
+				AlreadyGranted: []string{"im:message:reply"},
+				Granted:        []string{"im:message:send", "im:message:reply"},
+			},
+			expectedPresent: []string{
+				"登录成功! 用户: tester (ou_user)",
+				"本次请求 scopes: im:message:send im:message:reply",
+				"本次新授予 scopes: im:message:send",
+				"本次未授予 scopes: （空）",
+				"可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+			},
+			expectedAbsent: []string{
+				"最终已授权 scopes:",
+				"已有 scopes:",
+			},
+		},
+		{
+			name: "all already granted",
+			summary: &loginScopeSummary{
+				Requested:      []string{"im:message:send"},
+				AlreadyGranted: []string{"im:message:send"},
+				Granted:        []string{"im:message:send", "contact:user.base:readonly"},
+			},
+			expectedPresent: []string{
+				"本次请求 scopes: im:message:send",
+				"本次新授予 scopes: （空）",
+				"本次未授予 scopes: （空）",
+				"可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+			},
+			expectedAbsent: []string{
+				"最终已授权 scopes:",
+				"已有 scopes:",
+			},
+		},
+		{
+			name: "missing scopes are shown",
+			summary: &loginScopeSummary{
+				Requested: []string{"im:message:send", "im:message:reply"},
+				Missing:   []string{"im:message:send"},
+				Granted:   []string{"im:message:reply"},
+			},
+			expectedPresent: []string{
+				"本次请求 scopes: im:message:send im:message:reply",
+				"本次新授予 scopes: （空）",
+				"本次未授予 scopes: im:message:send",
+			},
+			expectedAbsent: []string{
+				"已有 scopes:",
+				"最终已授权 scopes:",
+				"可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			f, _, stderr, _ := cmdutil.TestFactory(t, nil)
+			writeLoginSuccess(&LoginOptions{}, getLoginMsg("zh"), f, "ou_user", "tester", tt.summary)
+
+			got := stderr.String()
+			for _, want := range tt.expectedPresent {
+				if !strings.Contains(got, want) {
+					t.Fatalf("stderr missing %q, got:\n%s", want, got)
+				}
+			}
+			for _, unwanted := range tt.expectedAbsent {
+				if strings.Contains(got, unwanted) {
+					t.Fatalf("stderr should not contain %q, got:\n%s", unwanted, got)
+				}
+			}
+		})
+	}
+}
+
+func TestBuildLoginScopeSummary_WithMissingScopes(t *testing.T) {
+	summary := buildLoginScopeSummary("im:message:send im:message:reply", "im:message:reply", "im:message:reply")
+	if got := strings.Join(summary.NewlyGranted, " "); got != "" {
+		t.Fatalf("NewlyGranted = %q, want empty", got)
+	}
+	if got := strings.Join(summary.AlreadyGranted, " "); got != "im:message:reply" {
+		t.Fatalf("AlreadyGranted = %q", got)
+	}
+	if got := strings.Join(summary.Missing, " "); got != "im:message:send" {
+		t.Fatalf("Missing = %q", got)
+	}
+}
+
+func TestAuthLoginRun_MissingRequestedScopeAlignsWithLoginSuccess(t *testing.T) {
+	keyring.MockInit()
+	setupLoginConfigDir(t)
+	t.Setenv("HOME", t.TempDir())
+
+	multi := &core.MultiAppConfig{
+		CurrentApp: "default",
+		Apps: []core.AppConfig{
+			{Name: "default", AppId: "cli_test"},
+		},
+	}
+	if err := core.SaveMultiAppConfig(multi); err != nil {
+		t.Fatalf("SaveMultiAppConfig() error = %v", err)
+	}
+
+	f, _, stderr, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		ProfileName: "default",
+		AppID:       "cli_test",
+		AppSecret:   "secret",
+		Brand:       core.BrandFeishu,
+	})
+
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathDeviceAuthorization,
+		Body: map[string]interface{}{
+			"device_code":               "device-code",
+			"user_code":                 "user-code",
+			"verification_uri":          "https://example.com/verify",
+			"verification_uri_complete": "https://example.com/verify?code=123",
+			"expires_in":                240,
+			"interval":                  0,
+		},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathOAuthTokenV2,
+		Body: map[string]interface{}{
+			"access_token":             "user-access-token",
+			"refresh_token":            "refresh-token",
+			"expires_in":               7200,
+			"refresh_token_expires_in": 604800,
+			"scope":                    "offline_access",
+		},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "GET",
+		URL:    larkauth.PathUserInfoV1,
+		Body: map[string]interface{}{
+			"code": 0,
+			"msg":  "ok",
+			"data": map[string]interface{}{
+				"open_id": "ou_user",
+				"name":    "tester",
+			},
+		},
+	})
+
+	err := authLoginRun(&LoginOptions{
+		Factory: f,
+		Ctx:     context.Background(),
+		Scope:   "im:message:send",
+	})
+	if err != nil {
+		t.Fatalf("expected nil error, got %v", err)
+	}
+	got := stderr.String()
+	for _, want := range []string{
+		"OK: 登录成功! 用户: tester (ou_user)",
+		"授权完成，但以下请求 scopes 未被授予: im:message:send",
+		"本次请求 scopes: im:message:send",
+		"本次未授予 scopes: im:message:send",
+		"以上结果是本次授权请求用户最终确认后的结果，请勿持续重试",
+		"scope 被禁用",
+		"lark-cli auth status",
+	} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("stderr missing %q, got:\n%s", want, got)
+		}
+	}
+	if strings.Contains(got, "最终已授权 scopes:") {
+		t.Fatalf("stderr should not contain final granted scopes, got:\n%s", got)
+	}
+	if strings.Contains(got, "ERROR:") {
+		t.Fatalf("stderr should not contain error prefix, got:\n%s", got)
+	}
+	stored := larkauth.GetStoredToken("cli_test", "ou_user")
+	if stored == nil {
+		t.Fatal("expected token to be stored when authorization succeeds with missing scopes")
+	}
+	if stored.Scope != "offline_access" {
+		t.Fatalf("stored scope = %q", stored.Scope)
+	}
+	cfg, err := core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatalf("LoadMultiAppConfig() error = %v", err)
+	}
+	if len(cfg.Apps) != 1 || len(cfg.Apps[0].Users) != 1 {
+		t.Fatalf("unexpected users in config: %#v", cfg.Apps)
+	}
+	if cfg.Apps[0].Users[0].UserOpenId != "ou_user" {
+		t.Fatalf("stored user open id = %q", cfg.Apps[0].Users[0].UserOpenId)
+	}
+	if cfg.Apps[0].Users[0].UserName != "tester" {
+		t.Fatalf("stored user name = %q", cfg.Apps[0].Users[0].UserName)
+	}
+}
+
+func TestAuthLoginRun_DeviceCodeUsesCachedRequestedScopes(t *testing.T) {
+	keyring.MockInit()
+	setupLoginConfigDir(t)
+	t.Setenv("HOME", t.TempDir())
+
+	multi := &core.MultiAppConfig{
+		CurrentApp: "default",
+		Apps: []core.AppConfig{
+			{Name: "default", AppId: "cli_test"},
+		},
+	}
+	if err := core.SaveMultiAppConfig(multi); err != nil {
+		t.Fatalf("SaveMultiAppConfig() error = %v", err)
+	}
+
+	f, stdout, stderr, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		ProfileName: "default",
+		AppID:       "cli_test",
+		AppSecret:   "secret",
+		Brand:       core.BrandFeishu,
+	})
+
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathDeviceAuthorization,
+		Body: map[string]interface{}{
+			"device_code":               "device-code",
+			"user_code":                 "user-code",
+			"verification_uri":          "https://example.com/verify",
+			"verification_uri_complete": "https://example.com/verify?code=123",
+			"expires_in":                240,
+			"interval":                  0,
+		},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathOAuthTokenV2,
+		Body: map[string]interface{}{
+			"access_token":             "user-access-token",
+			"refresh_token":            "refresh-token",
+			"expires_in":               7200,
+			"refresh_token_expires_in": 604800,
+			"scope":                    "im:message:send offline_access",
+		},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "GET",
+		URL:    larkauth.PathUserInfoV1,
+		Body: map[string]interface{}{
+			"code": 0,
+			"msg":  "ok",
+			"data": map[string]interface{}{
+				"open_id": "ou_user",
+				"name":    "tester",
+			},
+		},
+	})
+
+	err := authLoginRun(&LoginOptions{
+		Factory: f,
+		Ctx:     context.Background(),
+		Scope:   "im:message:send",
+		NoWait:  true,
+	})
+	if err != nil {
+		t.Fatalf("no-wait authLoginRun() error = %v", err)
+	}
+	if got, err := loadLoginRequestedScope("device-code"); err != nil || got != "im:message:send" {
+		t.Fatalf("loadLoginRequestedScope() = (%q, %v), want requested scope", got, err)
+	}
+
+	stdout.Reset()
+	stderr.Reset()
+
+	err = authLoginRun(&LoginOptions{
+		Factory:    f,
+		Ctx:        context.Background(),
+		DeviceCode: "device-code",
+	})
+	if err != nil {
+		t.Fatalf("device-code authLoginRun() error = %v", err)
+	}
+	got := stderr.String()
+	for _, want := range []string{
+		"OK: 登录成功! 用户: tester (ou_user)",
+		"本次请求 scopes: im:message:send",
+		"本次新授予 scopes: im:message:send",
+		"可执行 `lark-cli auth status` 查看账号当前已授予的全部 scopes；",
+	} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("stderr missing %q, got:\n%s", want, got)
+		}
+	}
+	if strings.Contains(got, "最终已授权 scopes:") {
+		t.Fatalf("stderr should not contain final granted scopes, got:\n%s", got)
+	}
+	if got, err := loadLoginRequestedScope("device-code"); err != nil || got != "" {
+		t.Fatalf("loadLoginRequestedScope() after cleanup = (%q, %v), want empty", got, err)
+	}
+}
+
+func TestWriteLoginSuccess_TextOutputEnglishIncludesStatusHintWhenNoMissingScopes(t *testing.T) {
+	f, _, stderr, _ := cmdutil.TestFactory(t, nil)
+
+	writeLoginSuccess(&LoginOptions{}, getLoginMsg("en"), f, "ou_user", "tester", &loginScopeSummary{
+		Requested:    []string{"im:message:send"},
+		NewlyGranted: []string{"im:message:send"},
+		Granted:      []string{"im:message:send"},
+	})
+
+	got := stderr.String()
+	for _, want := range []string{
+		"Login successful! User: tester (ou_user)",
+		"Requested scopes: im:message:send",
+		"Newly granted scopes: im:message:send",
+		"Not granted scopes: (none)",
+		"Run `lark-cli auth status` to inspect all scopes currently granted to the account.",
+	} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("stderr missing %q, got:\n%s", want, got)
+		}
+	}
+}
+
+func TestAuthLoginRun_DeviceCodeTokenNilCleansScopeCache(t *testing.T) {
+	keyring.MockInit()
+	setupLoginConfigDir(t)
+
+	if err := saveLoginRequestedScope("device-code", "im:message:send"); err != nil {
+		t.Fatalf("saveLoginRequestedScope() error = %v", err)
+	}
+
+	original := pollDeviceToken
+	t.Cleanup(func() { pollDeviceToken = original })
+	pollDeviceToken = func(ctx context.Context, httpClient *http.Client, appId, appSecret string, brand core.LarkBrand, deviceCode string, interval, expiresIn int, errOut io.Writer) *larkauth.DeviceFlowResult {
+		return &larkauth.DeviceFlowResult{OK: true, Token: nil}
+	}
+
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		ProfileName: "default",
+		AppID:       "cli_test",
+		AppSecret:   "secret",
+		Brand:       core.BrandFeishu,
+	})
+
+	err := authLoginRun(&LoginOptions{
+		Factory:    f,
+		Ctx:        context.Background(),
+		DeviceCode: "device-code",
+	})
+	if err == nil {
+		t.Fatal("expected error for nil token")
+	}
+	if !strings.Contains(err.Error(), "authorization succeeded but no token returned") {
+		t.Fatalf("error = %v, want nil token error", err)
+	}
+	if got, err := loadLoginRequestedScope("device-code"); err != nil || got != "" {
+		t.Fatalf("loadLoginRequestedScope() after nil token = (%q, %v), want empty", got, err)
+	}
+}
+
+func TestAuthLoginRun_JSONWriteFailure_NoWaitReturnsWriterError(t *testing.T) {
+	f, _, _, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		ProfileName: "default",
+		AppID:       "cli_test",
+		AppSecret:   "secret",
+		Brand:       core.BrandFeishu,
+	})
+	f.IOStreams.Out = failWriter{}
+
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathDeviceAuthorization,
+		Body: map[string]interface{}{
+			"device_code":               "device-code",
+			"user_code":                 "user-code",
+			"verification_uri":          "https://example.com/verify",
+			"verification_uri_complete": "https://example.com/verify?code=123",
+			"expires_in":                240,
+			"interval":                  5,
+		},
+	})
+
+	err := authLoginRun(&LoginOptions{
+		Factory: f,
+		Ctx:     context.Background(),
+		Scope:   "im:message:send",
+		NoWait:  true,
+		JSON:    true,
+	})
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if !strings.Contains(err.Error(), "failed to write JSON output") {
+		t.Fatalf("error = %v, want JSON write failure", err)
+	}
+}
+
+func TestAuthLoginRun_JSONWriteFailure_DeviceAuthorizationReturnsWriterError(t *testing.T) {
+	f, _, _, reg := cmdutil.TestFactory(t, &core.CliConfig{
+		ProfileName: "default",
+		AppID:       "cli_test",
+		AppSecret:   "secret",
+		Brand:       core.BrandFeishu,
+	})
+	f.IOStreams.Out = failWriter{}
+
+	reg.Register(&httpmock.Stub{
+		Method: "POST",
+		URL:    larkauth.PathDeviceAuthorization,
+		Body: map[string]interface{}{
+			"device_code":               "device-code",
+			"user_code":                 "user-code",
+			"verification_uri":          "https://example.com/verify",
+			"verification_uri_complete": "https://example.com/verify?code=123",
+			"expires_in":                240,
+			"interval":                  5,
+		},
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	err := authLoginRun(&LoginOptions{
+		Factory: f,
+		Ctx:     ctx,
+		Scope:   "im:message:send",
+		JSON:    true,
+	})
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if !strings.Contains(err.Error(), "failed to write JSON output") {
+		t.Fatalf("error = %v, want JSON write failure", err)
+	}
+}
+
 func TestGetDomainMetadata_ExcludesEvent(t *testing.T) {
 	domains := getDomainMetadata("zh")
 	for _, dm := range domains {
@@ -290,3 +903,37 @@ func TestGetDomainMetadata_ExcludesEvent(t *testing.T) {
 		}
 	}
 }
+
+func TestAllKnownDomains_ExcludesAuthDomainChildren(t *testing.T) {
+	domains := allKnownDomains()
+	if domains["whiteboard"] {
+		t.Error("whiteboard should not appear in known auth domains (it has auth_domain=docs)")
+	}
+	if !domains["docs"] {
+		t.Error("docs should still be a known auth domain")
+	}
+}
+
+func TestCollectScopesForDomains_ExpandsAuthDomainChildren(t *testing.T) {
+	scopes := collectScopesForDomains([]string{"docs"}, "user")
+	// docs domain should include whiteboard shortcut scopes (board:whiteboard:*)
+	found := false
+	for _, s := range scopes {
+		if strings.HasPrefix(s, "board:whiteboard:") {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("collectScopesForDomains([docs]) should include whiteboard scopes (board:whiteboard:*)")
+	}
+}
+
+func TestGetDomainMetadata_ExcludesAuthDomainChildren(t *testing.T) {
+	domains := getDomainMetadata("zh")
+	for _, dm := range domains {
+		if dm.Name == "whiteboard" {
+			t.Error("whiteboard should not appear in interactive domain list (has auth_domain=docs)")
+		}
+	}
+}

cmd/config/config_test.go

@@ -6,6 +6,8 @@ package config
 import (
 	"context"
 	"errors"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -21,6 +23,17 @@ func (n *noopConfigKeychain) Get(service, account string) (string, error) { retu
 func (n *noopConfigKeychain) Set(service, account, value string) error    { return nil }
 func (n *noopConfigKeychain) Remove(service, account string) error        { return nil }
 
+type recordingConfigKeychain struct {
+	removed []string
+}
+
+func (r *recordingConfigKeychain) Get(service, account string) (string, error) { return "", nil }
+func (r *recordingConfigKeychain) Set(service, account, value string) error    { return nil }
+func (r *recordingConfigKeychain) Remove(service, account string) error {
+	r.removed = append(r.removed, service+":"+account)
+	return nil
+}
+
 func TestConfigInitCmd_FlagParsing(t *testing.T) {
 	f, _, _, _ := cmdutil.TestFactory(t, nil)
 	f.IOStreams.In = strings.NewReader("secret123\n")
@@ -221,6 +234,66 @@ func TestConfigRemoveCmd_FlagParsing(t *testing.T) {
 	}
 }
 
+func TestConfigRemoveRun_SaveFailurePreservesExistingConfigAndSecrets(t *testing.T) {
+	configDir := t.TempDir()
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", configDir)
+
+	multi := &core.MultiAppConfig{
+		Apps: []core.AppConfig{{
+			AppId: "app-test",
+			AppSecret: core.SecretInput{
+				Ref: &core.SecretRef{Source: "keychain", ID: "appsecret:app-test"},
+			},
+			Brand: core.BrandFeishu,
+			Users: []core.AppUser{{UserOpenId: "ou_1", UserName: "Tester"}},
+		}},
+	}
+	if err := core.SaveMultiAppConfig(multi); err != nil {
+		t.Fatalf("SaveMultiAppConfig() error = %v", err)
+	}
+
+	kc := &recordingConfigKeychain{}
+	f, _, _, _ := cmdutil.TestFactory(t, nil)
+	f.Keychain = kc
+
+	// Make subsequent config saves fail while keeping the existing config readable.
+	if err := os.Chmod(configDir, 0500); err != nil {
+		t.Fatalf("Chmod(%s) error = %v", configDir, err)
+	}
+	defer os.Chmod(configDir, 0700)
+
+	err := configRemoveRun(&ConfigRemoveOptions{Factory: f})
+	if err == nil {
+		t.Fatal("expected save failure")
+	}
+	if !strings.Contains(err.Error(), "failed to save config") {
+		t.Fatalf("error = %v, want failed to save config", err)
+	}
+	if len(kc.removed) != 0 {
+		t.Fatalf("expected no keychain cleanup before successful save, got removals: %v", kc.removed)
+	}
+
+	// Restore permissions and confirm the original config is still intact.
+	if err := os.Chmod(configDir, 0700); err != nil {
+		t.Fatalf("restore Chmod(%s) error = %v", configDir, err)
+	}
+	saved, err := core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatalf("LoadMultiAppConfig() error = %v", err)
+	}
+	if saved == nil || len(saved.Apps) != 1 || saved.Apps[0].AppId != "app-test" {
+		t.Fatalf("saved config = %#v, want original single app preserved", saved)
+	}
+	if got := saved.Apps[0].AppSecret.Ref; got == nil || got.ID != "appsecret:app-test" {
+		t.Fatalf("saved app secret ref = %#v, want preserved keychain ref", got)
+	}
+
+	configPath := filepath.Join(configDir, "config.json")
+	if _, err := os.Stat(configPath); err != nil {
+		t.Fatalf("expected existing config file to remain, stat error = %v", err)
+	}
+}
+
 func TestSaveAsProfile_RejectsProfileNameCollisionWithExistingAppID(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
 

cmd/config/init_interactive.go

@@ -177,17 +177,26 @@ func runCreateAppFlow(ctx context.Context, f *cmdutil.Factory, brandOverride cor
 	// Step 2: Build and display verification URL + QR code
 	verificationURL := larkauth.BuildVerificationURL(authResp.VerificationUriComplete, build.Version)
 
-	// Show QR code in terminal
-	qr, qrErr := qrcode.New(verificationURL, qrcode.Medium)
-	if qrErr == nil {
-		fmt.Fprint(f.IOStreams.ErrOut, qr.ToSmallString(false))
+	// Branch on TTY: human-friendly copy in interactive terminals,
+	// preserve original copy for AI / non-interactive callers.
+	if f.IOStreams.IsTerminal {
+		fmt.Fprintf(f.IOStreams.ErrOut, "%s", msg.ScanQRCode)
+		qr, qrErr := qrcode.New(verificationURL, qrcode.Medium)
+		if qrErr == nil {
+			fmt.Fprint(f.IOStreams.ErrOut, qr.ToSmallString(false))
+		}
+		fmt.Fprintf(f.IOStreams.ErrOut, "%s", msg.ScanOrOpenLink)
+		fmt.Fprintf(f.IOStreams.ErrOut, "  %s\n\n", verificationURL)
+		fmt.Fprintf(f.IOStreams.ErrOut, "%s\n", msg.WaitingForScan)
+	} else {
+		qr, qrErr := qrcode.New(verificationURL, qrcode.Medium)
+		if qrErr == nil {
+			fmt.Fprint(f.IOStreams.ErrOut, qr.ToSmallString(false))
+		}
+		fmt.Fprintf(f.IOStreams.ErrOut, "%s", msg.OpenLinkNonTTY)
+		fmt.Fprintf(f.IOStreams.ErrOut, "  %s\n\n", verificationURL)
+		fmt.Fprintf(f.IOStreams.ErrOut, "%s\n", msg.WaitingForScanNonTTY)
 	}
-
-	fmt.Fprintf(f.IOStreams.ErrOut, "%s", msg.ScanOrOpenLink)
-	fmt.Fprintf(f.IOStreams.ErrOut, "  %s\n\n", verificationURL)
-
-	// Step 3: Poll for result
-	fmt.Fprintf(f.IOStreams.ErrOut, "%s\n", msg.WaitingForScan)
 	result, err := larkauth.PollAppRegistration(ctx, httpClient, core.BrandFeishu, authResp.DeviceCode, authResp.Interval, authResp.ExpiresIn, f.IOStreams.ErrOut)
 	if err != nil {
 		return nil, output.ErrAuth("%v", err)

cmd/config/init_messages.go

@@ -16,11 +16,16 @@ type initMsg struct {
 	Platform           string
 	SelectPlatform     string
 	Feishu             string
-	ScanOrOpenLink     string
-	WaitingForScan     string
-	DetectedLarkTenant string
-	AppCreated         string
-	ConfigSaved        string
+	// TTY (interactive) variants
+	ScanQRCode     string // header shown above QR code
+	ScanOrOpenLink string // post-QR alt link prompt ("or open...")
+	WaitingForScan string // active polling indicator
+	// Non-TTY (AI / non-interactive) variants — preserve original copy
+	OpenLinkNonTTY       string // primary link prompt
+	WaitingForScanNonTTY string // passive waiting indicator
+	DetectedLarkTenant   string
+	AppCreated           string
+	ConfigSaved          string
 }
 
 var initMsgZh = &initMsg{
@@ -29,12 +34,15 @@ var initMsgZh = &initMsg{
 	ConfigExistingApp:  "手动输入应用凭证",
 	Platform:           "平台",
 	SelectPlatform:     "选择平台",
-	Feishu:             "飞书",
-	ScanOrOpenLink:     "\n打开以下链接配置应用:\n\n",
-	WaitingForScan:     "等待配置应用...",
-	DetectedLarkTenant: "[lark-cli] 检测到 Lark 租户，切换端点重试...",
-	AppCreated:         "应用配置成功! App ID: %s",
-	ConfigSaved:        "应用配置成功! App ID: %s",
+	Feishu:               "飞书",
+	ScanQRCode:           "\n使用飞书 / Lark 扫码配置应用：\n\n",
+	ScanOrOpenLink:       "\n或打开以下链接完成配置：\n",
+	WaitingForScan:       "正在获取你的应用配置结果...",
+	OpenLinkNonTTY:       "\n打开以下链接配置应用:\n\n",
+	WaitingForScanNonTTY: "等待配置应用...",
+	DetectedLarkTenant:   "[lark-cli] 检测到 Lark 租户，切换端点重试...",
+	AppCreated:           "应用配置成功! App ID: %s",
+	ConfigSaved:          "应用配置成功! App ID: %s",
 }
 
 var initMsgEn = &initMsg{
@@ -43,12 +51,15 @@ var initMsgEn = &initMsg{
 	ConfigExistingApp:  "Enter app credentials yourself",
 	Platform:           "Platform",
 	SelectPlatform:     "Select platform",
-	Feishu:             "Feishu",
-	ScanOrOpenLink:     "\nOpen the link below to configure app:\n\n",
-	WaitingForScan:     "Waiting for app configuration...",
-	DetectedLarkTenant: "[lark-cli] Detected Lark tenant, switching endpoint...",
-	AppCreated:         "App configured! App ID: %s",
-	ConfigSaved:        "App configured! App ID: %s",
+	Feishu:               "Feishu",
+	ScanQRCode:           "\nScan the QR code with Feishu/Lark:\n\n",
+	ScanOrOpenLink:       "\nOr open the link below in your browser:\n",
+	WaitingForScan:       "Fetching configuration results...",
+	OpenLinkNonTTY:       "\nOpen the link below to configure app:\n\n",
+	WaitingForScanNonTTY: "Waiting for app configuration...",
+	DetectedLarkTenant:   "[lark-cli] Detected Lark tenant, switching endpoint...",
+	AppCreated:           "App configured! App ID: %s",
+	ConfigSaved:          "App configured! App ID: %s",
 }
 
 func getInitMsg(lang string) *initMsg {

cmd/config/init_messages_test.go

@@ -54,11 +54,14 @@ func assertAllFieldsNonEmpty(t *testing.T, msg *initMsg, label string) {
 		"Platform":           msg.Platform,
 		"SelectPlatform":     msg.SelectPlatform,
 		"Feishu":             msg.Feishu,
-		"ScanOrOpenLink":     msg.ScanOrOpenLink,
-		"WaitingForScan":     msg.WaitingForScan,
-		"DetectedLarkTenant": msg.DetectedLarkTenant,
-		"AppCreated":         msg.AppCreated,
-		"ConfigSaved":        msg.ConfigSaved,
+		"ScanQRCode":           msg.ScanQRCode,
+		"ScanOrOpenLink":       msg.ScanOrOpenLink,
+		"WaitingForScan":       msg.WaitingForScan,
+		"OpenLinkNonTTY":       msg.OpenLinkNonTTY,
+		"WaitingForScanNonTTY": msg.WaitingForScanNonTTY,
+		"DetectedLarkTenant":   msg.DetectedLarkTenant,
+		"AppCreated":           msg.AppCreated,
+		"ConfigSaved":          msg.ConfigSaved,
 	}
 	for name, val := range fields {
 		if val == "" {

cmd/config/remove.go

@@ -44,19 +44,21 @@ func configRemoveRun(opts *ConfigRemoveOptions) error {
 		return output.ErrValidation("not configured yet")
 	}
 
-	// Clean up keychain entries for all apps
-	for _, app := range config.Apps {
-		core.RemoveSecretStore(app.AppSecret, f.Keychain)
-		for _, user := range app.Users {
-			auth.RemoveStoredToken(app.AppId, user.UserOpenId)
-		}
-	}
-
-	// Save empty config
+	// Save empty config first. If this fails, keep secrets and tokens intact so the
+	// existing config can still be retried instead of ending up half-removed.
 	empty := &core.MultiAppConfig{Apps: []core.AppConfig{}}
 	if err := core.SaveMultiAppConfig(empty); err != nil {
 		return output.Errorf(output.ExitInternal, "internal", "failed to save config: %v", err)
 	}
+
+	// Clean up keychain entries for all apps after config is cleared.
+	for _, app := range config.Apps {
+		core.RemoveSecretStore(app.AppSecret, f.Keychain)
+		for _, user := range app.Users {
+			_ = auth.RemoveStoredToken(app.AppId, user.UserOpenId)
+		}
+	}
+
 	output.PrintSuccess(f.IOStreams.ErrOut, "Configuration removed")
 	userCount := 0
 	for _, app := range config.Apps {

cmd/diagnose_scope_test.go

@@ -0,0 +1,203 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/internal/registry"
+	"github.com/larksuite/cli/shortcuts"
+	shortcutTypes "github.com/larksuite/cli/shortcuts/common"
+)
+
+// ── Data types ────────────────────────────────────────────────────────
+
+type diagMethodEntry struct {
+	Domain   string   `json:"domain"`
+	Type     string   `json:"type"`     // "api" or "shortcut"
+	Method   string   `json:"method"`   // "calendar.calendars.search" or "+agenda"
+	Scope    string   `json:"scope"`    // minimum-privilege scope
+	Identity []string `json:"identity"` // ["user"], ["bot"], or ["user","bot"]
+}
+
+type diagScopeInfo struct {
+	Scope      string `json:"scope"`
+	Recommend  bool   `json:"recommend"`
+	InPriority bool   `json:"in_priority"`
+}
+
+type diagOutput struct {
+	Methods []diagMethodEntry `json:"methods"`
+	Scopes  []diagScopeInfo   `json:"scopes"`
+}
+
+// ── Core logic ────────────────────────────────────────────────────────
+
+// diagAllKnownDomains returns sorted, deduplicated domain names from both
+// from_meta projects and shortcuts.
+func diagAllKnownDomains() []string {
+	seen := make(map[string]bool)
+	for _, p := range registry.ListFromMetaProjects() {
+		seen[p] = true
+	}
+	for _, s := range shortcuts.AllShortcuts() {
+		if s.Service != "" {
+			seen[s.Service] = true
+		}
+	}
+	result := make([]string, 0, len(seen))
+	for d := range seen {
+		result = append(result, d)
+	}
+	sort.Strings(result)
+	return result
+}
+
+// methodKey uniquely identifies a method+scope pair for merging identities.
+type methodKey struct {
+	domain string
+	typ    string
+	method string
+	scope  string
+}
+
+// diagBuild builds the full output: flat methods list (merged identities) + scopes.
+func diagBuild(domains []string) diagOutput {
+	recommend := registry.LoadAutoApproveSet()
+	identities := []string{"user", "bot"}
+
+	merged := make(map[methodKey]*diagMethodEntry)
+	allSC := shortcuts.AllShortcuts()
+
+	for _, domain := range domains {
+		for _, identity := range identities {
+			for _, ce := range registry.CollectCommandScopes([]string{domain}, identity) {
+				for _, scope := range ce.Scopes {
+					method := domain + "." + strings.ReplaceAll(ce.Command, " ", ".")
+					k := methodKey{domain, "api", method, scope}
+					if e, ok := merged[k]; ok {
+						e.Identity = appendUniq(e.Identity, identity)
+					} else {
+						merged[k] = &diagMethodEntry{
+							Domain: domain, Type: "api",
+							Method: method,
+							Scope:  scope, Identity: []string{identity},
+						}
+					}
+				}
+			}
+
+			for _, sc := range allSC {
+				if sc.Service != domain || !diagShortcutSupportsIdentity(&sc, identity) {
+					continue
+				}
+				for _, scope := range sc.ScopesForIdentity(identity) {
+					k := methodKey{domain, "shortcut", sc.Command, scope}
+					if e, ok := merged[k]; ok {
+						e.Identity = appendUniq(e.Identity, identity)
+					} else {
+						merged[k] = &diagMethodEntry{
+							Domain: domain, Type: "shortcut",
+							Method: sc.Command,
+							Scope:  scope, Identity: []string{identity},
+						}
+					}
+				}
+			}
+		}
+	}
+
+	methods := make([]diagMethodEntry, 0, len(merged))
+	scopeSet := make(map[string]bool)
+	for _, e := range merged {
+		methods = append(methods, *e)
+		scopeSet[e.Scope] = true
+	}
+	sort.Slice(methods, func(i, j int) bool {
+		if methods[i].Domain != methods[j].Domain {
+			return methods[i].Domain < methods[j].Domain
+		}
+		if methods[i].Type != methods[j].Type {
+			return methods[i].Type < methods[j].Type
+		}
+		if methods[i].Method != methods[j].Method {
+			return methods[i].Method < methods[j].Method
+		}
+		return methods[i].Scope < methods[j].Scope
+	})
+
+	scopeList := make([]string, 0, len(scopeSet))
+	for s := range scopeSet {
+		scopeList = append(scopeList, s)
+	}
+	sort.Strings(scopeList)
+
+	priorities := registry.LoadScopePriorities()
+	scopes := make([]diagScopeInfo, len(scopeList))
+	for i, s := range scopeList {
+		_, inPri := priorities[s]
+		scopes[i] = diagScopeInfo{Scope: s, Recommend: recommend[s], InPriority: inPri}
+	}
+
+	return diagOutput{Methods: methods, Scopes: scopes}
+}
+
+func diagShortcutSupportsIdentity(sc *shortcutTypes.Shortcut, identity string) bool {
+	if len(sc.AuthTypes) == 0 {
+		return identity == "user"
+	}
+	for _, a := range sc.AuthTypes {
+		if a == identity {
+			return true
+		}
+	}
+	return false
+}
+
+func appendUniq(ss []string, s string) []string {
+	for _, existing := range ss {
+		if existing == s {
+			return ss
+		}
+	}
+	return append(ss, s)
+}
+
+// ── Snapshot generation ───────────────────────────────────────────────
+//
+// Generates a JSON snapshot of all API methods and shortcuts with their
+// minimum-privilege scopes. Consumed by scripts/scope_audit.py.
+//
+// Usage:
+//
+//	SCOPE_SNAPSHOT_DIR=/tmp/scope-audit go test ./cmd/ -run TestScopeSnapshot -v
+func TestScopeSnapshot(t *testing.T) {
+	dir := os.Getenv("SCOPE_SNAPSHOT_DIR")
+	if dir == "" {
+		t.Skip("set SCOPE_SNAPSHOT_DIR to enable snapshot generation")
+	}
+
+	registry.Init()
+	result := diagBuild(diagAllKnownDomains())
+
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		t.Fatalf("mkdir: %v", err)
+	}
+	path := filepath.Join(dir, "snapshot.json")
+
+	data, err := json.MarshalIndent(result, "", "  ")
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	if err := os.WriteFile(path, data, 0o644); err != nil {
+		t.Fatalf("write: %v", err)
+	}
+
+	t.Logf("Wrote %s (%d methods, %d scopes)", path, len(result.Methods), len(result.Scopes))
+}

cmd/doctor/doctor.go

@@ -238,7 +238,7 @@ func checkCLIUpdate() []checkResult {
 	if update.IsNewer(latest, current) {
 		return []checkResult{warn("cli_update",
 			fmt.Sprintf("%s → %s available", current, latest),
-			"run: npm update -g @larksuite/cli")}
+			"run: lark-cli update (or: npm install -g @larksuite/cli)")}
 	}
 	return []checkResult{pass("cli_update", latest+" (up to date)")}
 }

cmd/root.go

@@ -22,6 +22,7 @@ import (
 	"github.com/larksuite/cli/cmd/profile"
 	"github.com/larksuite/cli/cmd/schema"
 	"github.com/larksuite/cli/cmd/service"
+	cmdupdate "github.com/larksuite/cli/cmd/update"
 	internalauth "github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/build"
 	"github.com/larksuite/cli/internal/cmdutil"
@@ -78,7 +79,7 @@ AI AGENT SKILLS:
         npx skills add larksuite/cli -s lark-calendar -y
         npx skills add larksuite/cli -s lark-im -y
 
-    Learn more: https://github.com/larksuite/cli#install-ai-agent-skills
+    Learn more: https://github.com/larksuite/cli#agent-skills
 
 COMMUNITY:
     GitHub:     https://github.com/larksuite/cli
@@ -118,6 +119,7 @@ func Execute() int {
 	rootCmd.AddCommand(api.NewCmdApi(f, nil))
 	rootCmd.AddCommand(schema.NewCmdSchema(f, nil))
 	rootCmd.AddCommand(completion.NewCmdCompletion(f))
+	rootCmd.AddCommand(cmdupdate.NewCmdUpdate(f))
 	service.RegisterServiceCommands(rootCmd, f)
 	shortcuts.RegisterShortcuts(rootCmd, f)
 

cmd/root_test.go

@@ -187,3 +187,12 @@ func TestEnrichPermissionError_SpecialCharsEscaped(t *testing.T) {
 		})
 	}
 }
+
+func TestRootLong_AgentSkillsLinkTargetsReadmeSection(t *testing.T) {
+	if !strings.Contains(rootLong, "https://github.com/larksuite/cli#agent-skills") {
+		t.Fatalf("root help should link to the README Agent Skills section, got:\n%s", rootLong)
+	}
+	if strings.Contains(rootLong, "https://github.com/larksuite/cli#install-ai-agent-skills") {
+		t.Fatalf("root help should not reference the removed install-ai-agent-skills anchor, got:\n%s", rootLong)
+	}
+}

cmd/schema/schema.go

@@ -73,6 +73,12 @@ func printResourceList(w io.Writer, spec map[string]interface{}) {
 	fmt.Fprintf(w, "%sUsage: lark-cli schema %s.<resource>.<method>%s\n", output.Dim, name, output.Reset)
 }
 
+// hasFileFields returns true if any requestBody field has type "file".
+func hasFileFields(method map[string]interface{}) (bool, []string) {
+	names := cmdutil.DetectFileFields(method)
+	return len(names) > 0, names
+}
+
 func printMethodDetail(w io.Writer, spec map[string]interface{}, resName, methodName string, method map[string]interface{}) {
 	servicePath := registry.GetStrFromMap(spec, "servicePath")
 	specName := registry.GetStrFromMap(spec, "name")
@@ -80,6 +86,7 @@ func printMethodDetail(w io.Writer, spec map[string]interface{}, resName, method
 	fullPath := servicePath + "/" + methodPath
 	httpMethod := registry.GetStrFromMap(method, "httpMethod")
 	desc := registry.GetStrFromMap(method, "description")
+	isFileUpload, fileFieldNames := hasFileFields(method)
 
 	fmt.Fprintf(w, "%s%s.%s.%s%s\n\n", output.Bold, specName, resName, methodName, output.Reset)
 
@@ -138,11 +145,25 @@ func printMethodDetail(w io.Writer, spec map[string]interface{}, resName, method
 		if len(params) == 0 {
 			fmt.Fprintf(w, "%sParameters:%s\n\n", output.Bold, output.Reset)
 		}
-		fmt.Fprintf(w, "  %s--data%s  <json>  %soptional%s\n", output.Cyan, output.Reset, output.Dim, output.Reset)
+		fileUploadTag := ""
+		if isFileUpload {
+			fileUploadTag = fmt.Sprintf("  %s[file upload]%s", output.Yellow, output.Reset)
+		}
+		fmt.Fprintf(w, "  %s--data%s  <json>  %soptional%s%s\n", output.Cyan, output.Reset, output.Dim, output.Reset, fileUploadTag)
 		requestBody, _ := method["requestBody"].(map[string]interface{})
 		if len(requestBody) > 0 {
 			printNestedFields(w, requestBody, "      ", "")
 		}
+
+		if isFileUpload {
+			if len(fileFieldNames) == 1 {
+				fmt.Fprintf(w, "\n  %s--file%s  <[field=]path>  %sfile upload%s\n", output.Cyan, output.Reset, output.Dim, output.Reset)
+				fmt.Fprintf(w, "      Upload file as multipart/form-data. Default field: %q\n", fileFieldNames[0])
+			} else {
+				fmt.Fprintf(w, "\n  %s--file%s  <field=path>  %sfile upload%s\n", output.Cyan, output.Reset, output.Dim, output.Reset)
+				fmt.Fprintf(w, "      Upload file as multipart/form-data. Fields: %s\n", strings.Join(fileFieldNames, ", "))
+			}
+		}
 		fmt.Fprintln(w)
 	}
 
@@ -184,7 +205,13 @@ func printMethodDetail(w io.Writer, spec map[string]interface{}, resName, method
 	}
 
 	// CLI example
-	fmt.Fprintf(w, "%sCLI:%s      lark-cli %s %s %s\n", output.Bold, output.Reset, specName, resName, methodName)
+	if isFileUpload && len(fileFieldNames) == 1 {
+		fmt.Fprintf(w, "%sCLI:%s      lark-cli %s %s %s --file <path>\n", output.Bold, output.Reset, specName, resName, methodName)
+	} else if isFileUpload {
+		fmt.Fprintf(w, "%sCLI:%s      lark-cli %s %s %s --file <field=path>\n", output.Bold, output.Reset, specName, resName, methodName)
+	} else {
+		fmt.Fprintf(w, "%sCLI:%s      lark-cli %s %s %s\n", output.Bold, output.Reset, specName, resName, methodName)
+	}
 
 	// Docs
 	if docUrl := registry.GetStrFromMap(method, "docUrl"); docUrl != "" {

cmd/schema/schema_test.go

@@ -4,6 +4,7 @@
 package schema
 
 import (
+	"bytes"
 	"strings"
 	"testing"
 
@@ -61,3 +62,123 @@ func TestSchemaCmd_UnknownService(t *testing.T) {
 		t.Errorf("expected 'Unknown service' error, got: %v", err)
 	}
 }
+
+func TestPrintMethodDetail_FileUpload(t *testing.T) {
+	spec := map[string]interface{}{
+		"name":        "im",
+		"servicePath": "/open-apis/im/v1",
+	}
+	method := map[string]interface{}{
+		"path":        "images",
+		"httpMethod":  "POST",
+		"description": "Upload an image",
+		"requestBody": map[string]interface{}{
+			"image_type": map[string]interface{}{
+				"type":     "string",
+				"required": true,
+			},
+			"image": map[string]interface{}{
+				"type":     "file",
+				"required": true,
+			},
+		},
+		"accessTokens": []interface{}{"user", "tenant"},
+	}
+
+	var buf bytes.Buffer
+	printMethodDetail(&buf, spec, "images", "create", method)
+	out := buf.String()
+
+	if !strings.Contains(out, "file upload") {
+		t.Errorf("expected 'file upload' marker in output, got:\n%s", out)
+	}
+	if !strings.Contains(out, "--file") {
+		t.Errorf("expected '--file' in output, got:\n%s", out)
+	}
+	if !strings.Contains(out, `"image"`) {
+		t.Errorf("expected default field name 'image' in output, got:\n%s", out)
+	}
+	if !strings.Contains(out, "--file <path>") {
+		t.Errorf("expected CLI example with --file <path>, got:\n%s", out)
+	}
+}
+
+func TestPrintMethodDetail_NoFileUpload(t *testing.T) {
+	spec := map[string]interface{}{
+		"name":        "calendar",
+		"servicePath": "/open-apis/calendar/v4",
+	}
+	method := map[string]interface{}{
+		"path":        "events",
+		"httpMethod":  "POST",
+		"description": "Create an event",
+		"requestBody": map[string]interface{}{
+			"summary": map[string]interface{}{
+				"type":     "string",
+				"required": true,
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	printMethodDetail(&buf, spec, "events", "create", method)
+	out := buf.String()
+
+	if strings.Contains(out, "file upload") {
+		t.Errorf("did not expect 'file upload' marker for non-file method, got:\n%s", out)
+	}
+	if strings.Contains(out, "--file") {
+		t.Errorf("did not expect '--file' for non-file method, got:\n%s", out)
+	}
+}
+
+func TestHasFileFields(t *testing.T) {
+	tests := []struct {
+		name       string
+		method     map[string]interface{}
+		wantBool   bool
+		wantFields []string
+	}{
+		{
+			name: "has file field",
+			method: map[string]interface{}{
+				"requestBody": map[string]interface{}{
+					"image": map[string]interface{}{"type": "file"},
+					"name":  map[string]interface{}{"type": "string"},
+				},
+			},
+			wantBool:   true,
+			wantFields: []string{"image"},
+		},
+		{
+			name: "no file field",
+			method: map[string]interface{}{
+				"requestBody": map[string]interface{}{
+					"name": map[string]interface{}{"type": "string"},
+				},
+			},
+			wantBool:   false,
+			wantFields: nil,
+		},
+		{
+			name:       "no requestBody",
+			method:     map[string]interface{}{},
+			wantBool:   false,
+			wantFields: nil,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, names := hasFileFields(tt.method)
+			if got != tt.wantBool {
+				t.Errorf("hasFileFields() = %v, want %v", got, tt.wantBool)
+			}
+			if tt.wantFields == nil && names != nil {
+				t.Errorf("expected nil names, got %v", names)
+			}
+			if tt.wantFields != nil && len(names) != len(tt.wantFields) {
+				t.Errorf("expected %d field names, got %d", len(tt.wantFields), len(names))
+			}
+		})
+	}
+}

cmd/service/service.go

@@ -5,7 +5,6 @@ package service
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"io"
 	"strings"
@@ -112,6 +111,13 @@ type ServiceMethodOptions struct {
 	Format    string
 	JqExpr    string
 	DryRun    bool
+	File       string   // --file flag value
+	FileFields []string // auto-detected file field names from metadata
+}
+
+// detectFileFields delegates to the shared cmdutil.DetectFileFields helper.
+func detectFileFields(method map[string]interface{}) []string {
+	return cmdutil.DetectFileFields(method)
 }
 
 func registerMethod(parent *cobra.Command, spec map[string]interface{}, method map[string]interface{}, name string, resName string, f *cmdutil.Factory) {
@@ -148,10 +154,10 @@ func NewCmdServiceMethod(f *cmdutil.Factory, spec, method map[string]interface{}
 		},
 	}
 
-	cmd.Flags().StringVar(&opts.Params, "params", "", "URL/query parameters JSON")
+	cmd.Flags().StringVar(&opts.Params, "params", "", "URL/query parameters JSON (supports - for stdin)")
 	switch httpMethod {
 	case "POST", "PUT", "PATCH", "DELETE":
-		cmd.Flags().StringVar(&opts.Data, "data", "", "request body JSON")
+		cmd.Flags().StringVar(&opts.Data, "data", "", "request body JSON (supports - for stdin)")
 	}
 	cmd.Flags().StringVar(&asStr, "as", "auto", "identity type: user | bot | auto (default)")
 	cmd.Flags().StringVarP(&opts.Output, "output", "o", "", "output file path for binary responses")
@@ -162,6 +168,16 @@ func NewCmdServiceMethod(f *cmdutil.Factory, spec, method map[string]interface{}
 	cmd.Flags().StringVarP(&opts.JqExpr, "jq", "q", "", "jq expression to filter JSON output")
 	cmd.Flags().BoolVar(&opts.DryRun, "dry-run", false, "print request without executing")
 
+	// Conditionally register --file for methods with file-type fields.
+	fileFields := detectFileFields(method)
+	opts.FileFields = fileFields
+	if len(fileFields) > 0 {
+		switch httpMethod {
+		case "POST", "PUT", "PATCH", "DELETE":
+			cmd.Flags().StringVar(&opts.File, "file", "", "file to upload ([field=]path, supports - for stdin)")
+		}
+	}
+
 	_ = cmd.RegisterFlagCompletionFunc("as", func(_ *cobra.Command, _ []string, _ string) ([]string, cobra.ShellCompDirective) {
 		return []string{"user", "bot"}, cobra.ShellCompDirectiveNoFileComp
 	})
@@ -213,12 +229,15 @@ func serviceMethodRun(opts *ServiceMethodOptions) error {
 		}
 	}
 
-	request, err := buildServiceRequest(opts)
+	request, fileMeta, err := buildServiceRequest(opts)
 	if err != nil {
 		return err
 	}
 
 	if opts.DryRun {
+		if fileMeta != nil {
+			return cmdutil.PrintDryRunWithFile(f.IOStreams.Out, request, config, opts.Format, fileMeta.FieldName, fileMeta.FilePath, fileMeta.FormFields)
+		}
 		return serviceDryRun(f, request, config, opts.Format)
 	}
 
@@ -250,6 +269,7 @@ func serviceMethodRun(opts *ServiceMethodOptions) error {
 		JqExpr:     opts.JqExpr,
 		Out:        out,
 		ErrOut:     f.IOStreams.ErrOut,
+		FileIO:     f.ResolveFileIO(opts.Ctx),
 		CheckError: checkErr,
 	})
 }
@@ -303,19 +323,28 @@ func checkServiceScopes(ctx context.Context, cred *credential.CredentialProvider
 }
 
 // buildServiceRequest parses flags, builds the URL with path/query params, and returns a RawApiRequest.
-func buildServiceRequest(opts *ServiceMethodOptions) (client.RawApiRequest, error) {
+// When dryRun is true and a file is provided, file reading is skipped and
+// FileUploadMeta is returned instead so the caller can render dry-run output.
+func buildServiceRequest(opts *ServiceMethodOptions) (client.RawApiRequest, *cmdutil.FileUploadMeta, error) {
 	spec := opts.Spec
 	method := opts.Method
 	schemaPath := opts.SchemaPath
 	httpMethod := registry.GetStrFromMap(method, "httpMethod")
 
-	var params map[string]interface{}
-	if opts.Params != "" {
-		if err := json.Unmarshal([]byte(opts.Params), &params); err != nil {
-			return client.RawApiRequest{}, output.ErrValidation("--params invalid JSON format")
-		}
-	} else {
-		params = map[string]interface{}{}
+	// stdin is an io.Reader consumed at most once. Only one of --params/--data
+	// may use "-" (stdin); the conflict check below prevents silent data loss.
+	stdin := opts.Factory.IOStreams.In
+
+	// Validate --file mutual exclusions.
+	if err := cmdutil.ValidateFileFlag(opts.File, opts.Params, opts.Data, opts.Output, opts.PageAll, httpMethod); err != nil {
+		return client.RawApiRequest{}, nil, err
+	}
+	if opts.Params == "-" && opts.Data == "-" {
+		return client.RawApiRequest{}, nil, output.ErrValidation("--params and --data cannot both read from stdin (-)")
+	}
+	params, err := cmdutil.ParseJSONMap(opts.Params, "--params", stdin)
+	if err != nil {
+		return client.RawApiRequest{}, nil, err
 	}
 
 	url := registry.GetStrFromMap(spec, "servicePath") + "/" + registry.GetStrFromMap(method, "path")
@@ -328,13 +357,13 @@ func buildServiceRequest(opts *ServiceMethodOptions) (client.RawApiRequest, erro
 		}
 		val, ok := params[name]
 		if !ok || util.IsEmptyValue(val) {
-			return client.RawApiRequest{}, output.ErrWithHint(output.ExitValidation, "validation",
+			return client.RawApiRequest{}, nil, output.ErrWithHint(output.ExitValidation, "validation",
 				fmt.Sprintf("missing required path parameter: %s", name),
 				fmt.Sprintf("lark-cli schema %s", schemaPath))
 		}
 		valStr := fmt.Sprintf("%v", val)
 		if err := validate.ResourceName(valStr, name); err != nil {
-			return client.RawApiRequest{}, output.ErrValidation("%s", err)
+			return client.RawApiRequest{}, nil, output.ErrValidation("%s", err)
 		}
 		url = strings.Replace(url, "{"+name+"}", validate.EncodePathSegment(valStr), 1)
 		delete(params, name)
@@ -350,7 +379,7 @@ func buildServiceRequest(opts *ServiceMethodOptions) (client.RawApiRequest, erro
 		required, _ := p["required"].(bool)
 		isPaginationParam := opts.PageAll && (name == "page_token" || name == "page_size")
 		if required && !isPaginationParam && (!exists || util.IsEmptyValue(value)) {
-			return client.RawApiRequest{}, output.ErrWithHint(output.ExitValidation, "validation",
+			return client.RawApiRequest{}, nil, output.ErrWithHint(output.ExitValidation, "validation",
 				fmt.Sprintf("missing required query parameter: %s", name),
 				fmt.Sprintf("lark-cli schema %s", schemaPath))
 		}
@@ -364,22 +393,60 @@ func buildServiceRequest(opts *ServiceMethodOptions) (client.RawApiRequest, erro
 		}
 	}
 
-	data, err := cmdutil.ParseOptionalBody(httpMethod, opts.Data)
-	if err != nil {
-		return client.RawApiRequest{}, err
-	}
-
 	request := client.RawApiRequest{
 		Method: httpMethod,
 		URL:    url,
 		Params: queryParams,
-		Data:   data,
 		As:     opts.As,
 	}
-	if opts.Output != "" {
-		request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileDownload())
+
+	if opts.File != "" {
+		// File upload: determine default field name from metadata.
+		defaultField := "file"
+		if len(opts.FileFields) == 1 {
+			defaultField = opts.FileFields[0]
+		}
+		fieldName, filePath, isStdin := cmdutil.ParseFileFlag(opts.File, defaultField)
+
+		// Parse --data as form fields.
+		var dataFields any
+		if opts.Data != "" {
+			dataFields, err = cmdutil.ParseOptionalBody(httpMethod, opts.Data, stdin)
+			if err != nil {
+				return client.RawApiRequest{}, nil, err
+			}
+			if _, ok := dataFields.(map[string]any); !ok {
+				return client.RawApiRequest{}, nil, output.ErrValidation("--data must be a JSON object when used with --file")
+			}
+		}
+
+		if opts.DryRun {
+			return request, &cmdutil.FileUploadMeta{
+				FieldName: fieldName, FilePath: filePath, FormFields: dataFields,
+			}, nil
+		}
+
+		fd, err := cmdutil.BuildFormdata(
+			opts.Factory.ResolveFileIO(opts.Ctx),
+			fieldName, filePath, isStdin, stdin, dataFields,
+		)
+		if err != nil {
+			return client.RawApiRequest{}, nil, err
+		}
+		request.Data = fd
+		request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileUpload())
+	} else {
+		data, err := cmdutil.ParseOptionalBody(httpMethod, opts.Data, stdin)
+		if err != nil {
+			return client.RawApiRequest{}, nil, err
+		}
+		request.Data = data
+		if opts.Output != "" {
+			request.ExtraOpts = append(request.ExtraOpts, larkcore.WithFileDownload())
+		}
 	}
-	return request, nil
+
+	return request, nil, nil
 }
 
 func serviceDryRun(f *cmdutil.Factory, request client.RawApiRequest, config *core.CliConfig, format string) error {

cmd/service/service_test.go

@@ -4,6 +4,7 @@
 package service
 
 import (
+	"os"
 	"strings"
 	"testing"
 
@@ -308,7 +309,7 @@ func TestServiceMethod_InvalidParamsJSON(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected error for invalid JSON")
 	}
-	if !strings.Contains(err.Error(), "--params invalid JSON format") {
+	if !strings.Contains(err.Error(), "--params invalid format") {
 		t.Errorf("unexpected error: %v", err)
 	}
 }
@@ -331,6 +332,24 @@ func TestServiceMethod_InvalidDataJSON(t *testing.T) {
 	}
 }
 
+func TestServiceMethod_ParamsAndDataBothStdinConflict(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
+	spec := map[string]interface{}{
+		"name": "svc", "servicePath": "/open-apis/svc/v1",
+	}
+	method := map[string]interface{}{"path": "items", "httpMethod": "POST", "parameters": map[string]interface{}{}}
+	cmd := NewCmdServiceMethod(f, spec, method, "create", "items", nil)
+	cmd.SetArgs([]string{"--params", "-", "--data", "-", "--dry-run"})
+
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected error when both --params and --data use stdin")
+	}
+	if !strings.Contains(err.Error(), "cannot both read from stdin") {
+		t.Errorf("expected stdin conflict error, got: %v", err)
+	}
+}
+
 func TestServiceMethod_OutputAndPageAllConflict(t *testing.T) {
 	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
 	spec := map[string]interface{}{
@@ -692,6 +711,144 @@ func TestScopeAwareChecker_ScopeError_BotMode(t *testing.T) {
 	}
 }
 
+// ── file upload ──
+
+func imImageMethod() map[string]interface{} {
+	return map[string]interface{}{
+		"path":       "images",
+		"httpMethod": "POST",
+		"requestBody": map[string]interface{}{
+			"image_type": map[string]interface{}{
+				"type":     "string",
+				"required": true,
+			},
+			"image": map[string]interface{}{
+				"type":     "file",
+				"required": true,
+			},
+		},
+		"accessTokens": []interface{}{"user", "tenant"},
+	}
+}
+
+func imSpec() map[string]interface{} {
+	return map[string]interface{}{
+		"name":        "im",
+		"servicePath": "/open-apis/im/v1",
+	}
+}
+
+func TestServiceMethod_FileFlagRegistered(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
+	cmd := NewCmdServiceMethod(f, imSpec(), imImageMethod(), "create", "images", nil)
+	flag := cmd.Flags().Lookup("file")
+	if flag == nil {
+		t.Fatal("expected --file flag to be registered for file upload method")
+	}
+}
+
+func TestServiceMethod_FileFlagNotRegistered(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
+	cmd := NewCmdServiceMethod(f, driveSpec(), driveMethod("POST", nil), "copy", "files", nil)
+	flag := cmd.Flags().Lookup("file")
+	if flag != nil {
+		t.Fatal("expected --file flag NOT to be registered for non-file method")
+	}
+}
+
+func TestServiceMethod_FileFlagNotRegisteredForGET(t *testing.T) {
+	getMethod := map[string]interface{}{
+		"path":       "images",
+		"httpMethod": "GET",
+		"requestBody": map[string]interface{}{
+			"image": map[string]interface{}{
+				"type": "file",
+			},
+		},
+	}
+	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
+	cmd := NewCmdServiceMethod(f, imSpec(), getMethod, "get", "images", nil)
+	flag := cmd.Flags().Lookup("file")
+	if flag != nil {
+		t.Fatal("expected --file flag NOT to be registered for GET method")
+	}
+}
+
+func TestServiceMethod_FileUpload_DryRun(t *testing.T) {
+	tmpDir := t.TempDir()
+	tmpFile := tmpDir + "/test.jpg"
+	if err := os.WriteFile(tmpFile, []byte("fake-image"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	f, stdout, _, _ := cmdutil.TestFactory(t, testConfig)
+	cmd := NewCmdServiceMethod(f, imSpec(), imImageMethod(), "create", "images", nil)
+	cmd.SetArgs([]string{
+		"--file", "image=" + tmpFile,
+		"--data", `{"image_type":"message"}`,
+		"--dry-run",
+		"--as", "bot",
+	})
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, "image") {
+		t.Errorf("expected dry-run output to mention file field, got: %s", out)
+	}
+	if !strings.Contains(out, "Dry Run") {
+		t.Errorf("expected dry-run header, got: %s", out)
+	}
+}
+
+func TestDetectFileFields(t *testing.T) {
+	tests := []struct {
+		name   string
+		method map[string]interface{}
+		want   []string
+	}{
+		{
+			name: "single file field",
+			method: map[string]interface{}{
+				"requestBody": map[string]interface{}{
+					"image": map[string]interface{}{"type": "file"},
+					"name":  map[string]interface{}{"type": "string"},
+				},
+			},
+			want: []string{"image"},
+		},
+		{
+			name: "no file fields",
+			method: map[string]interface{}{
+				"requestBody": map[string]interface{}{
+					"name": map[string]interface{}{"type": "string"},
+				},
+			},
+			want: nil,
+		},
+		{
+			name:   "no requestBody",
+			method: map[string]interface{}{},
+			want:   nil,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := detectFileFields(tt.method)
+			if len(got) != len(tt.want) {
+				t.Errorf("detectFileFields() = %v, want %v", got, tt.want)
+				return
+			}
+			for i := range got {
+				if got[i] != tt.want[i] {
+					t.Errorf("detectFileFields()[%d] = %q, want %q", i, got[i], tt.want[i])
+				}
+			}
+		})
+	}
+}
+
 // ── helpers ──
 
 func isExitError(err error, target **output.ExitError) bool {

cmd/update/update.go

@@ -0,0 +1,314 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdupdate
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"github.com/larksuite/cli/internal/build"
+	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/output"
+	"github.com/larksuite/cli/internal/selfupdate"
+	"github.com/larksuite/cli/internal/update"
+)
+
+const (
+	repoURL      = "https://github.com/larksuite/cli"
+	maxNpmOutput = 2000
+	osWindows    = "windows"
+)
+
+// Overridable for testing.
+var (
+	fetchLatest    = func() (string, error) { return update.FetchLatest() }
+	currentVersion = func() string { return build.Version }
+	currentOS      = runtime.GOOS
+	newUpdater     = func() *selfupdate.Updater { return selfupdate.New() }
+)
+
+func isWindows() bool { return currentOS == osWindows }
+
+func releaseURL(version string) string {
+	return repoURL + "/releases/tag/v" + strings.TrimPrefix(version, "v")
+}
+
+func changelogURL() string { return repoURL + "/blob/main/CHANGELOG.md" }
+
+// --- Terminal symbols (ASCII fallback on Windows) ---
+
+func symOK() string {
+	if isWindows() {
+		return "[OK]"
+	}
+	return "✓"
+}
+
+func symFail() string {
+	if isWindows() {
+		return "[FAIL]"
+	}
+	return "✗"
+}
+
+func symWarn() string {
+	if isWindows() {
+		return "[WARN]"
+	}
+	return "⚠"
+}
+
+func symArrow() string {
+	if isWindows() {
+		return "->"
+	}
+	return "→"
+}
+
+// --- Command ---
+
+// UpdateOptions holds inputs for the update command.
+type UpdateOptions struct {
+	Factory *cmdutil.Factory
+	JSON    bool
+	Force   bool
+	Check   bool
+}
+
+// NewCmdUpdate creates the update command.
+func NewCmdUpdate(f *cmdutil.Factory) *cobra.Command {
+	opts := &UpdateOptions{Factory: f}
+
+	cmd := &cobra.Command{
+		Use:   "update",
+		Short: "Update lark-cli to the latest version",
+		Long: `Update lark-cli to the latest version.
+
+Detects the installation method automatically:
+  - npm install: runs npm install -g @larksuite/cli@<version>
+  - manual/other: shows GitHub Releases download URL
+
+Use --json for structured output (for AI agents and scripts).
+Use --check to only check for updates without installing.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return updateRun(opts)
+		},
+	}
+	cmdutil.DisableAuthCheck(cmd)
+	cmd.Flags().BoolVar(&opts.JSON, "json", false, "structured JSON output")
+	cmd.Flags().BoolVar(&opts.Force, "force", false, "force reinstall even if already up to date")
+	cmd.Flags().BoolVar(&opts.Check, "check", false, "only check for updates, do not install")
+
+	return cmd
+}
+
+func updateRun(opts *UpdateOptions) error {
+	io := opts.Factory.IOStreams
+	cur := currentVersion()
+	updater := newUpdater()
+
+	updater.CleanupStaleFiles()
+	output.PendingNotice = nil
+
+	// 1. Fetch latest version
+	latest, err := fetchLatest()
+	if err != nil {
+		return reportError(opts, io, output.ExitNetwork, "network", "failed to check latest version: %s", err)
+	}
+
+	// 2. Validate version format
+	if update.ParseVersion(latest) == nil {
+		return reportError(opts, io, output.ExitInternal, "update_error", "invalid version from registry: %s", latest)
+	}
+
+	// 3. Compare versions
+	if !opts.Force && !update.IsNewer(latest, cur) {
+		if opts.JSON {
+			output.PrintJson(io.Out, map[string]interface{}{
+				"ok": true, "previous_version": cur, "current_version": cur,
+				"latest_version": latest, "action": "already_up_to_date",
+				"message": fmt.Sprintf("lark-cli %s is already up to date", cur),
+			})
+			return nil
+		}
+		fmt.Fprintf(io.ErrOut, "%s lark-cli %s is already up to date\n", symOK(), cur)
+		return nil
+	}
+
+	// 4. Detect installation method
+	detect := updater.DetectInstallMethod()
+
+	// 5. --check
+	if opts.Check {
+		return reportCheckResult(opts, io, cur, latest, detect.CanAutoUpdate())
+	}
+
+	// 6. Execute update
+	if !detect.CanAutoUpdate() {
+		return doManualUpdate(opts, io, cur, latest, detect)
+	}
+	return doNpmUpdate(opts, io, cur, latest, updater)
+}
+
+// --- Output helpers ---
+
+func reportError(opts *UpdateOptions, io *cmdutil.IOStreams, exitCode int, errType, format string, args ...interface{}) error {
+	msg := fmt.Sprintf(format, args...)
+	if opts.JSON {
+		output.PrintJson(io.Out, map[string]interface{}{
+			"ok": false, "error": map[string]interface{}{"type": errType, "message": msg},
+		})
+		return output.ErrBare(exitCode)
+	}
+	return output.Errorf(exitCode, errType, "%s", msg)
+}
+
+func reportCheckResult(opts *UpdateOptions, io *cmdutil.IOStreams, cur, latest string, canAutoUpdate bool) error {
+	if opts.JSON {
+		output.PrintJson(io.Out, map[string]interface{}{
+			"ok": true, "previous_version": cur, "current_version": cur,
+			"latest_version": latest, "action": "update_available",
+			"auto_update": canAutoUpdate,
+			"message":     fmt.Sprintf("lark-cli %s %s %s available", cur, symArrow(), latest),
+			"url":         releaseURL(latest), "changelog": changelogURL(),
+		})
+		return nil
+	}
+	fmt.Fprintf(io.ErrOut, "Update available: %s %s %s\n", cur, symArrow(), latest)
+	fmt.Fprintf(io.ErrOut, "  Release:   %s\n", releaseURL(latest))
+	fmt.Fprintf(io.ErrOut, "  Changelog: %s\n", changelogURL())
+	if canAutoUpdate {
+		fmt.Fprintf(io.ErrOut, "\nRun `lark-cli update` to install.\n")
+	} else {
+		fmt.Fprintf(io.ErrOut, "\nDownload the release above to update manually.\n")
+	}
+	return nil
+}
+
+func doManualUpdate(opts *UpdateOptions, io *cmdutil.IOStreams, cur, latest string, detect selfupdate.DetectResult) error {
+	reason := detect.ManualReason()
+	if opts.JSON {
+		output.PrintJson(io.Out, map[string]interface{}{
+			"ok": true, "previous_version": cur, "latest_version": latest,
+			"action":  "manual_required",
+			"message": fmt.Sprintf("Automatic update unavailable: %s (path: %s)", reason, detect.ResolvedPath),
+			"url":     releaseURL(latest), "changelog": changelogURL(),
+		})
+		return nil
+	}
+	fmt.Fprintf(io.ErrOut, "Automatic update unavailable: %s (path: %s).\n\n", reason, detect.ResolvedPath)
+	fmt.Fprintf(io.ErrOut, "To update manually, download the latest release:\n")
+	fmt.Fprintf(io.ErrOut, "  Release:   %s\n", releaseURL(latest))
+	fmt.Fprintf(io.ErrOut, "  Changelog: %s\n", changelogURL())
+	fmt.Fprintf(io.ErrOut, "\nOr install via npm:\n  npm install -g %s@%s\n", selfupdate.NpmPackage, latest)
+	fmt.Fprintf(io.ErrOut, "\nAfter updating, also update skills:\n  npx -y skills add larksuite/cli -g -y\n")
+	return nil
+}
+
+func doNpmUpdate(opts *UpdateOptions, io *cmdutil.IOStreams, cur, latest string, updater *selfupdate.Updater) error {
+	restore, err := updater.PrepareSelfReplace()
+	if err != nil {
+		return reportError(opts, io, output.ExitAPI, "update_error", "failed to prepare update: %s", err)
+	}
+
+	if !opts.JSON {
+		fmt.Fprintf(io.ErrOut, "Updating lark-cli %s %s %s via npm ...\n", cur, symArrow(), latest)
+	}
+
+	npmResult := updater.RunNpmInstall(latest)
+	if npmResult.Err != nil {
+		restore()
+		combined := npmResult.CombinedOutput()
+		if opts.JSON {
+			output.PrintJson(io.Out, map[string]interface{}{
+				"ok": false, "error": map[string]interface{}{
+					"type": "update_error", "message": fmt.Sprintf("npm install failed: %s", npmResult.Err),
+					"detail": selfupdate.Truncate(combined, maxNpmOutput),
+					"hint":   permissionHint(combined),
+				},
+			})
+			return output.ErrBare(output.ExitAPI)
+		}
+		if npmResult.Stdout.Len() > 0 {
+			fmt.Fprint(io.ErrOut, npmResult.Stdout.String())
+		}
+		if npmResult.Stderr.Len() > 0 {
+			fmt.Fprint(io.ErrOut, npmResult.Stderr.String())
+		}
+		fmt.Fprintf(io.ErrOut, "\n%s Update failed: %s\n", symFail(), npmResult.Err)
+		if hint := permissionHint(combined); hint != "" {
+			fmt.Fprintf(io.ErrOut, "  %s\n", hint)
+		}
+		return output.ErrBare(output.ExitAPI)
+	}
+
+	// Verify the new binary is functional before proceeding.
+	// If corrupt, restore the previous version from .old.
+	if err := updater.VerifyBinary(latest); err != nil {
+		restore()
+		msg := fmt.Sprintf("new binary verification failed: %s", err)
+		hint := verificationFailureHint(updater, latest)
+		if opts.JSON {
+			output.PrintJson(io.Out, map[string]interface{}{
+				"ok":    false,
+				"error": map[string]interface{}{"type": "update_error", "message": msg, "hint": hint},
+			})
+			return output.ErrBare(output.ExitAPI)
+		}
+		fmt.Fprintf(io.ErrOut, "\n%s %s\n", symFail(), msg)
+		fmt.Fprintf(io.ErrOut, "  %s\n", hint)
+		return output.ErrBare(output.ExitAPI)
+	}
+
+	// Skills update (best-effort).
+	skillsResult := updater.RunSkillsUpdate()
+
+	if opts.JSON {
+		result := map[string]interface{}{
+			"ok": true, "previous_version": cur, "current_version": latest,
+			"latest_version": latest, "action": "updated",
+			"message": fmt.Sprintf("lark-cli updated from %s to %s", cur, latest),
+			"url":     releaseURL(latest), "changelog": changelogURL(),
+		}
+		if skillsResult.Err != nil {
+			result["skills_warning"] = fmt.Sprintf("skills update failed: %s", skillsResult.Err)
+			if detail := strings.TrimSpace(skillsResult.Stderr.String()); detail != "" {
+				result["skills_detail"] = selfupdate.Truncate(detail, maxNpmOutput)
+			}
+		}
+		output.PrintJson(io.Out, result)
+		return nil
+	}
+
+	fmt.Fprintf(io.ErrOut, "\n%s Successfully updated lark-cli from %s to %s\n", symOK(), cur, latest)
+	fmt.Fprintf(io.ErrOut, "  Changelog: %s\n", changelogURL())
+	fmt.Fprintf(io.ErrOut, "\nUpdating skills ...\n")
+	if skillsResult.Err != nil {
+		fmt.Fprintf(io.ErrOut, "%s Skills update failed: %s\n", symWarn(), skillsResult.Err)
+		if detail := strings.TrimSpace(skillsResult.Stderr.String()); detail != "" {
+			fmt.Fprintf(io.ErrOut, "  %s\n", selfupdate.Truncate(detail, 500))
+		}
+		fmt.Fprintf(io.ErrOut, "  Run manually: npx -y skills add larksuite/cli -g -y\n")
+	} else {
+		fmt.Fprintf(io.ErrOut, "%s Skills updated\n", symOK())
+	}
+	return nil
+}
+
+func permissionHint(npmOutput string) string {
+	if strings.Contains(npmOutput, "EACCES") && !isWindows() {
+		return "Permission denied. Try: sudo lark-cli update, or adjust your npm global prefix: https://docs.npmjs.com/resolving-eacces-permissions-errors"
+	}
+	return ""
+}
+
+func verificationFailureHint(updater *selfupdate.Updater, latest string) string {
+	if updater.CanRestorePreviousVersion() {
+		return "the previous version has been restored"
+	}
+	return fmt.Sprintf("automatic rollback is unavailable on this platform; reinstall manually: npm install -g %s@%s, or download %s", selfupdate.NpmPackage, latest, releaseURL(latest))
+}

cmd/update/update_test.go

@@ -0,0 +1,851 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdupdate
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/core"
+	"github.com/larksuite/cli/internal/output"
+	"github.com/larksuite/cli/internal/selfupdate"
+)
+
+// newTestFactory creates a test factory with minimal config.
+func newTestFactory(t *testing.T) (*cmdutil.Factory, *bytes.Buffer, *bytes.Buffer) {
+	t.Helper()
+	f, stdout, stderr, _ := cmdutil.TestFactory(t, &core.CliConfig{})
+	return f, stdout, stderr
+}
+
+// mockDetect sets up newUpdater to return an Updater with the given DetectResult.
+// It preserves any existing NpmInstallOverride/SkillsUpdateOverride that may be set later.
+func mockDetect(t *testing.T, result selfupdate.DetectResult) {
+	t.Helper()
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult { return result }
+		return u
+	}
+	t.Cleanup(func() { newUpdater = origNew })
+}
+
+// mockDetectAndNpm sets up newUpdater with detect, npm install, and skills overrides all at once.
+func mockDetectAndNpm(t *testing.T, result selfupdate.DetectResult,
+	npmFn func(string) *selfupdate.NpmResult,
+	skillsFn func() *selfupdate.NpmResult) {
+	t.Helper()
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult { return result }
+		u.NpmInstallOverride = npmFn
+		u.SkillsUpdateOverride = skillsFn
+		u.VerifyOverride = func(string) error { return nil }
+		return u
+	}
+	t.Cleanup(func() { newUpdater = origNew })
+}
+
+func TestUpdateAlreadyUpToDate_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "1.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "already_up_to_date"`) {
+		t.Errorf("expected already_up_to_date in JSON output, got: %s", out)
+	}
+	if !strings.Contains(out, `"ok": true`) {
+		t.Errorf("expected ok:true in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateAlreadyUpToDate_Human(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "1.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	out := stderr.String()
+	if !strings.Contains(out, "already up to date") {
+		t.Errorf("expected 'already up to date' in stderr, got: %s", out)
+	}
+}
+
+func TestUpdateManual_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+	cmd.SilenceErrors = true
+	cmd.SilenceUsage = true
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallManual, ResolvedPath: "/usr/local/bin/lark-cli"})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "manual_required"`) {
+		t.Errorf("expected manual_required in output, got: %s", out)
+	}
+	if !strings.Contains(out, "not installed via npm") {
+		t.Errorf("expected accurate reason in output, got: %s", out)
+	}
+	if !strings.Contains(out, "releases/tag/v2.0.0") {
+		t.Errorf("expected version-pinned URL in output, got: %s", out)
+	}
+}
+
+func TestUpdateManual_Human(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallManual, ResolvedPath: "/usr/local/bin/lark-cli"})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stderr.String()
+	if !strings.Contains(out, "not installed via npm") {
+		t.Errorf("expected 'not installed via npm' in stderr, got: %s", out)
+	}
+	if !strings.Contains(out, "releases/tag/v2.0.0") {
+		t.Errorf("expected version-pinned URL in stderr, got: %s", out)
+	}
+}
+
+func TestUpdateNpm_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "updated"`) {
+		t.Errorf("expected updated in output, got: %s", out)
+	}
+}
+
+func TestUpdateNpm_Human(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stderr.String()
+	if !strings.Contains(out, "Successfully updated") {
+		t.Errorf("expected success message in stderr, got: %s", out)
+	}
+}
+
+func TestUpdateForce_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--force", "--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "1.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "updated"`) {
+		t.Errorf("expected updated in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateFetchError_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "", errors.New("network timeout") }
+	defer func() { fetchLatest = origFetch }()
+
+	err := cmd.Execute()
+	// cobra silences errors when RunE returns; we just check stdout
+	_ = err
+	out := stdout.String()
+	if !strings.Contains(out, `"ok": false`) {
+		t.Errorf("expected ok:false in JSON output, got: %s", out)
+	}
+	if !strings.Contains(out, "network timeout") {
+		t.Errorf("expected 'network timeout' in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateFetchError_Human(t *testing.T) {
+	f, _, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "", errors.New("network timeout") }
+	defer func() { fetchLatest = origFetch }()
+
+	// Suppress cobra's default error printing.
+	cmd.SilenceErrors = true
+	cmd.SilenceUsage = true
+
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected non-nil error, got nil")
+	}
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected *output.ExitError, got %T: %v", err, err)
+	}
+	if exitErr.Code != output.ExitNetwork {
+		t.Errorf("expected ExitNetwork (%d), got %d", output.ExitNetwork, exitErr.Code)
+	}
+}
+
+func TestUpdateInvalidVersion_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "not-a-version", nil }
+	defer func() { fetchLatest = origFetch }()
+
+	_ = cmd.Execute()
+	out := stdout.String()
+	if !strings.Contains(out, "invalid version") {
+		t.Errorf("expected 'invalid version' in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateDevVersion_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "1.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "DEV" }
+	defer func() { currentVersion = origVersion }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "updated"`) {
+		t.Errorf("expected updated in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateNpmFail_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult {
+			return selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true}
+		}
+		u.NpmInstallOverride = func(version string) *selfupdate.NpmResult {
+			r := &selfupdate.NpmResult{}
+			fmt.Fprint(&r.Stderr, "EACCES: permission denied")
+			r.Err = errors.New("npm install failed")
+			return r
+		}
+		return u
+	}
+	defer func() { newUpdater = origNew }()
+
+	_ = cmd.Execute()
+	out := stdout.String()
+	if !strings.Contains(out, "permission denied") {
+		t.Errorf("expected 'permission denied' in JSON output, got: %s", out)
+	}
+	if !strings.Contains(out, `"hint"`) {
+		t.Errorf("expected 'hint' field in JSON output, got: %s", out)
+	}
+}
+
+func TestUpdateNpmFail_Human(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult {
+			return selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true}
+		}
+		u.NpmInstallOverride = func(version string) *selfupdate.NpmResult {
+			r := &selfupdate.NpmResult{}
+			fmt.Fprint(&r.Stderr, "EACCES: permission denied")
+			r.Err = errors.New("npm install failed")
+			return r
+		}
+		return u
+	}
+	defer func() { newUpdater = origNew }()
+
+	cmd.SilenceErrors = true
+	cmd.SilenceUsage = true
+	_ = cmd.Execute()
+	out := stderr.String()
+	if !strings.Contains(out, "Update failed") {
+		t.Errorf("expected 'Update failed' in stderr, got: %s", out)
+	}
+	if !strings.Contains(out, "Permission denied") {
+		t.Errorf("expected permission hint in stderr, got: %s", out)
+	}
+}
+
+func TestUpdateNpmVerifyFail_JSON_NoRestoreHintWhenBackupUnavailable(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult {
+			return selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true}
+		}
+		u.NpmInstallOverride = func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} }
+		u.VerifyOverride = func(string) error { return errors.New("bad binary") }
+		u.RestoreAvailableOverride = func() bool { return false }
+		u.SkillsUpdateOverride = func() *selfupdate.NpmResult {
+			t.Fatal("skills update should not run when binary verification fails")
+			return nil
+		}
+		return u
+	}
+	defer func() { newUpdater = origNew }()
+
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatal("expected verification failure")
+	}
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected *output.ExitError, got %T: %v", err, err)
+	}
+	if exitErr.Code != output.ExitAPI {
+		t.Fatalf("expected ExitAPI (%d), got %d", output.ExitAPI, exitErr.Code)
+	}
+
+	out := stdout.String()
+	if !strings.Contains(out, "automatic rollback is unavailable") {
+		t.Errorf("expected unavailable rollback hint, got: %s", out)
+	}
+	if strings.Contains(out, "previous version has been restored") {
+		t.Errorf("should not claim restore when no backup is available, got: %s", out)
+	}
+	if !strings.Contains(out, "npm install -g @larksuite/cli@2.0.0") {
+		t.Errorf("expected manual reinstall command in hint, got: %s", out)
+	}
+}
+
+func TestUpdateCheck_JSON_Npm(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json", "--check"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "update_available"`) {
+		t.Errorf("expected update_available action, got: %s", out)
+	}
+	if !strings.Contains(out, `"auto_update": true`) {
+		t.Errorf("expected auto_update:true for npm, got: %s", out)
+	}
+	if !strings.Contains(out, "releases/tag/v2.0.0") {
+		t.Errorf("expected version-pinned release URL, got: %s", out)
+	}
+	if !strings.Contains(out, "CHANGELOG") {
+		t.Errorf("expected changelog URL, got: %s", out)
+	}
+}
+
+func TestUpdateCheck_Human_Npm(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--check"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stderr.String()
+	if !strings.Contains(out, "Update available") {
+		t.Errorf("expected 'Update available' in stderr, got: %s", out)
+	}
+	if !strings.Contains(out, "lark-cli update") {
+		t.Errorf("expected 'lark-cli update' instruction for npm, got: %s", out)
+	}
+}
+
+func TestUpdateCheck_Human_Manual(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--check"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallManual, ResolvedPath: "/usr/local/bin/lark-cli"})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stderr.String()
+	if !strings.Contains(out, "Update available") {
+		t.Errorf("expected 'Update available' in stderr, got: %s", out)
+	}
+	if !strings.Contains(out, "manually") {
+		t.Errorf("expected manual download instruction for non-npm, got: %s", out)
+	}
+	if strings.Contains(out, "lark-cli update` to install") {
+		t.Errorf("should NOT suggest 'lark-cli update' for manual install, got: %s", out)
+	}
+}
+
+func TestUpdateNpmNotFound_FallsBackToManual(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	// npm detected (node_modules in path) but npm binary not available
+	mockDetect(t, selfupdate.DetectResult{
+		Method:       selfupdate.InstallNpm,
+		ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli",
+		NpmAvailable: false,
+	})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "manual_required"`) {
+		t.Errorf("expected manual_required when npm not found, got: %s", out)
+	}
+	// Must say "npm is not available", not generic "not installed via npm"
+	if !strings.Contains(out, "npm is not available") {
+		t.Errorf("expected 'npm is not available' reason when npm detected but missing, got: %s", out)
+	}
+}
+
+func TestReleaseURL(t *testing.T) {
+	got := releaseURL("2.0.0")
+	if got != "https://github.com/larksuite/cli/releases/tag/v2.0.0" {
+		t.Errorf("expected version-pinned URL, got: %s", got)
+	}
+	got2 := releaseURL("v1.5.0")
+	if got2 != "https://github.com/larksuite/cli/releases/tag/v1.5.0" {
+		t.Errorf("expected no double v prefix, got: %s", got2)
+	}
+}
+
+func TestPermissionHint(t *testing.T) {
+	origOS := currentOS
+	defer func() { currentOS = origOS }()
+
+	// Linux: EACCES should produce a hint with npm prefix guidance.
+	currentOS = "linux"
+	hint := permissionHint("EACCES: permission denied, access '/usr/local/lib'")
+	if !strings.Contains(hint, "npm global prefix") {
+		t.Errorf("expected npm prefix hint on linux, got: %s", hint)
+	}
+	if strings.Contains(hint, "sudo npm install -g") {
+		t.Errorf("should not suggest raw sudo npm install, got: %s", hint)
+	}
+
+	// Windows: EACCES hint is suppressed (no EACCES on Windows).
+	currentOS = "windows"
+	hint = permissionHint("EACCES: permission denied")
+	if hint != "" {
+		t.Errorf("expected empty hint on Windows, got: %s", hint)
+	}
+
+	// Non-EACCES error: always empty.
+	currentOS = "linux"
+	if got := permissionHint("some other error"); got != "" {
+		t.Errorf("expected empty hint for non-EACCES, got: %s", got)
+	}
+}
+
+func TestUpdateWindows_NpmSuccess_JSON(t *testing.T) {
+	// With the rename trick, Windows npm installs can now auto-update.
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	origOS := currentOS
+	currentOS = osWindows
+	defer func() { currentOS = origOS }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: `C:\npm\node_modules\@larksuite\cli\bin\lark-cli.exe`, NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"action": "updated"`) {
+		t.Errorf("expected updated on Windows with rename trick, got: %s", out)
+	}
+}
+
+func TestUpdateWindows_Check_JSON(t *testing.T) {
+	// --check on Windows npm should report auto_update: true (rename trick available).
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json", "--check"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	origOS := currentOS
+	currentOS = osWindows
+	defer func() { currentOS = origOS }()
+	mockDetect(t, selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: `C:\node_modules\@larksuite\cli\bin\lark-cli.exe`, NpmAvailable: true})
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	if !strings.Contains(out, `"auto_update": true`) {
+		t.Errorf("expected auto_update:true on Windows (rename trick), got: %s", out)
+	}
+}
+
+func TestUpdateWindows_Symbols(t *testing.T) {
+	origOS := currentOS
+	defer func() { currentOS = origOS }()
+
+	currentOS = "windows"
+	if symOK() != "[OK]" {
+		t.Errorf("expected [OK] on Windows, got: %s", symOK())
+	}
+	if symFail() != "[FAIL]" {
+		t.Errorf("expected [FAIL] on Windows, got: %s", symFail())
+	}
+	if symWarn() != "[WARN]" {
+		t.Errorf("expected [WARN] on Windows, got: %s", symWarn())
+	}
+	if symArrow() != "->" {
+		t.Errorf("expected -> on Windows, got: %s", symArrow())
+	}
+
+	currentOS = "darwin"
+	if symOK() != "\u2713" {
+		t.Errorf("expected \u2713 on darwin, got: %s", symOK())
+	}
+	if symArrow() != "\u2192" {
+		t.Errorf("expected \u2192 on darwin, got: %s", symArrow())
+	}
+}
+
+func TestUpdateNpm_SkillsSuccess_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+	mockDetectAndNpm(t,
+		selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true},
+		func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+		func() *selfupdate.NpmResult { return &selfupdate.NpmResult{} },
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	// Should NOT have skills_warning when skills succeed
+	if strings.Contains(out, "skills_warning") {
+		t.Errorf("expected no skills_warning on success, got: %s", out)
+	}
+}
+
+func TestUpdateNpm_SkillsFail_JSON(t *testing.T) {
+	f, stdout, _ := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{"--json"})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult {
+			return selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true}
+		}
+		u.NpmInstallOverride = func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} }
+		u.VerifyOverride = func(string) error { return nil }
+		// Skills update fails
+		u.SkillsUpdateOverride = func() *selfupdate.NpmResult {
+			r := &selfupdate.NpmResult{}
+			r.Stderr.WriteString("npx: command not found")
+			r.Err = fmt.Errorf("exit status 127")
+			return r
+		}
+		return u
+	}
+	defer func() { newUpdater = origNew }()
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stdout.String()
+	// CLI update should still succeed (ok:true)
+	if !strings.Contains(out, `"ok": true`) {
+		t.Errorf("expected ok:true despite skills failure, got: %s", out)
+	}
+	if !strings.Contains(out, `"action": "updated"`) {
+		t.Errorf("expected action:updated despite skills failure, got: %s", out)
+	}
+	// Should have skills_warning with detail
+	if !strings.Contains(out, "skills_warning") {
+		t.Errorf("expected skills_warning in output, got: %s", out)
+	}
+	if !strings.Contains(out, "skills_detail") {
+		t.Errorf("expected skills_detail in output, got: %s", out)
+	}
+}
+
+func TestUpdateNpm_SkillsFail_Human(t *testing.T) {
+	f, _, stderr := newTestFactory(t)
+	cmd := NewCmdUpdate(f)
+	cmd.SetArgs([]string{})
+
+	origFetch := fetchLatest
+	fetchLatest = func() (string, error) { return "2.0.0", nil }
+	defer func() { fetchLatest = origFetch }()
+	origVersion := currentVersion
+	currentVersion = func() string { return "1.0.0" }
+	defer func() { currentVersion = origVersion }()
+
+	origNew := newUpdater
+	newUpdater = func() *selfupdate.Updater {
+		u := selfupdate.New()
+		u.DetectOverride = func() selfupdate.DetectResult {
+			return selfupdate.DetectResult{Method: selfupdate.InstallNpm, ResolvedPath: "/node_modules/@larksuite/cli/bin/lark-cli", NpmAvailable: true}
+		}
+		u.NpmInstallOverride = func(version string) *selfupdate.NpmResult { return &selfupdate.NpmResult{} }
+		u.VerifyOverride = func(string) error { return nil }
+		u.SkillsUpdateOverride = func() *selfupdate.NpmResult {
+			r := &selfupdate.NpmResult{}
+			r.Stderr.WriteString("npx: command not found")
+			r.Err = fmt.Errorf("exit status 127")
+			return r
+		}
+		return u
+	}
+	defer func() { newUpdater = origNew }()
+
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	out := stderr.String()
+	// CLI update should still show success
+	if !strings.Contains(out, "Successfully updated") {
+		t.Errorf("expected CLI success message, got: %s", out)
+	}
+	// Skills warning should be shown
+	if !strings.Contains(out, "Skills update failed") {
+		t.Errorf("expected skills failure warning, got: %s", out)
+	}
+	if !strings.Contains(out, "npx -y skills add") {
+		t.Errorf("expected manual skills command hint, got: %s", out)
+	}
+}
+
+func TestTruncate(t *testing.T) {
+	long := strings.Repeat("x", 3000)
+	got := selfupdate.Truncate(long, 2000)
+	if len(got) != 2000 {
+		t.Errorf("expected truncated length 2000, got %d", len(got))
+	}
+
+	short := "hello"
+	got2 := selfupdate.Truncate(short, 2000)
+	if got2 != "hello" {
+		t.Errorf("expected 'hello', got %q", got2)
+	}
+}

extension/credential/env/env_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package env
 
 import (

extension/credential/registry_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential
 
 import (

extension/fileio/errors.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package fileio
+
+import "errors"
+
+// ErrPathValidation indicates the path failed security validation
+// (traversal, absolute, control chars, symlink escape, etc.).
+var ErrPathValidation = errors.New("path validation failed")
+
+// PathValidationError wraps a path validation error.
+// errors.Is(err, ErrPathValidation) returns true.
+// errors.Is(err, <original OS error>) also works via the chain.
+type PathValidationError struct {
+	Err error // original error
+}
+
+func (e *PathValidationError) Error() string { return e.Err.Error() }
+func (e *PathValidationError) Unwrap() []error {
+	return []error{ErrPathValidation, e.Err}
+}
+
+// MkdirError indicates parent directory creation failed.
+// Use errors.As(err, &fileio.MkdirError{}) to match.
+type MkdirError struct {
+	Err error
+}
+
+func (e *MkdirError) Error() string { return e.Err.Error() }
+func (e *MkdirError) Unwrap() error { return e.Err }
+
+// WriteError indicates file write failed.
+// Use errors.As(err, &fileio.WriteError{}) to match.
+type WriteError struct {
+	Err error
+}
+
+func (e *WriteError) Error() string { return e.Err.Error() }
+func (e *WriteError) Unwrap() error { return e.Err }

extension/fileio/registry.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package fileio
+
+import "sync"
+
+var (
+	mu       sync.Mutex
+	provider Provider
+)
+
+// Register registers a FileIO Provider.
+// Later registrations override earlier ones (last-write-wins).
+// Unlike credential.Register which appends to a chain (multiple credential
+// sources are tried in order), FileIO uses a single active provider because
+// only one file I/O backend is active at a time (local vs server mode).
+// Typically called from init() via blank import.
+func Register(p Provider) {
+	mu.Lock()
+	defer mu.Unlock()
+	provider = p
+}
+
+// GetProvider returns the currently registered Provider.
+// Returns nil if no provider has been registered.
+func GetProvider() Provider {
+	mu.Lock()
+	defer mu.Unlock()
+	return provider
+}

extension/fileio/types.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package fileio
+
+import (
+	"context"
+	"io"
+	"io/fs"
+)
+
+// Provider creates FileIO instances.
+// Follows the same API style as extension/credential.Provider.
+type Provider interface {
+	Name() string
+	ResolveFileIO(ctx context.Context) FileIO
+}
+
+// FileIO abstracts file transfer operations for CLI commands.
+// The default implementation operates on the local filesystem with
+// path validation, directory creation, and atomic writes.
+// Inject a custom implementation via Factory.FileIOProvider to replace
+// file transfer behavior (e.g. streaming in server mode).
+type FileIO interface {
+	// Open opens a file for reading (upload, attachment, template scenarios).
+	// The default implementation validates the path via SafeInputPath.
+	Open(name string) (File, error)
+
+	// Stat returns file metadata (size validation, existence checks).
+	// The default implementation validates the path via SafeInputPath.
+	// Use os.IsNotExist(err) to distinguish "file not found" from "invalid path".
+	Stat(name string) (FileInfo, error)
+
+	// ResolvePath returns the validated, absolute path for the given output path.
+	// The default implementation delegates to SafeOutputPath.
+	// Use this to obtain the canonical saved path for user-facing output.
+	ResolvePath(path string) (string, error)
+
+	// Save writes content to the target path and returns a SaveResult.
+	// The default implementation validates via SafeOutputPath, creates
+	// parent directories, and writes atomically.
+	Save(path string, opts SaveOptions, body io.Reader) (SaveResult, error)
+}
+
+// FileInfo is a minimal subset of os.FileInfo covering actual CLI usage.
+// os.FileInfo satisfies this interface.
+type FileInfo interface {
+	Size() int64
+	IsDir() bool
+	Mode() fs.FileMode
+}
+
+// File is the interface returned by FileIO.Open.
+// It covers the subset of *os.File methods actually used by CLI commands.
+// *os.File satisfies this interface without adaptation.
+type File interface {
+	io.Reader
+	io.ReaderAt
+	io.Closer
+}
+
+// SaveResult holds the outcome of a Save operation.
+type SaveResult interface {
+	Size() int64 // actual bytes written
+}
+
+// SaveOptions carries metadata for Save.
+// The default (local) implementation ignores these fields;
+// server-mode implementations use them to construct streaming response frames.
+type SaveOptions struct {
+	ContentType   string // MIME type
+	ContentLength int64  // content length; -1 if unknown
+}

internal/auth/auth_response_log.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package auth
 
 import (

internal/charcheck/charcheck.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+// Package charcheck provides character-level security checks shared across
+// path validation (localfileio) and input validation (validate) packages.
+// Keeping these checks in one place ensures consistent detection of dangerous
+// Unicode and control characters throughout the codebase.
+package charcheck
+
+import "fmt"
+
+// RejectControlChars rejects C0 control characters (except \t and \n) and
+// dangerous Unicode characters (Bidi overrides, zero-width, line/paragraph
+// separators) that enable visual spoofing attacks.
+func RejectControlChars(value, flagName string) error {
+	for _, r := range value {
+		if r != '\t' && r != '\n' && (r < 0x20 || r == 0x7f) {
+			return fmt.Errorf("%s contains invalid control characters", flagName)
+		}
+		if IsDangerousUnicode(r) {
+			return fmt.Errorf("%s contains dangerous Unicode characters", flagName)
+		}
+	}
+	return nil
+}
+
+// IsDangerousUnicode identifies Unicode code points used for visual spoofing
+// attacks. These characters are invisible or alter text direction, allowing
+// attackers to make "report.exe" display as "report.txt" (Bidi override) or
+// insert hidden content (zero-width characters).
+func IsDangerousUnicode(r rune) bool {
+	switch {
+	case r >= 0x200B && r <= 0x200D: // zero-width space/non-joiner/joiner
+		return true
+	case r == 0xFEFF: // BOM / ZWNBSP
+		return true
+	case r >= 0x202A && r <= 0x202E: // Bidi: LRE/RLE/PDF/LRO/RLO
+		return true
+	case r >= 0x2028 && r <= 0x2029: // line/paragraph separator
+		return true
+	case r >= 0x2066 && r <= 0x2069: // Bidi isolates: LRI/RLI/FSI/PDI
+		return true
+	}
+	return false
+}

internal/client/api_errors.go

@@ -0,0 +1,68 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package client
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/larksuite/cli/internal/output"
+)
+
+const rawAPIJSONHint = "The endpoint may have returned an empty or non-standard JSON body. If it returns a file, rerun with --output."
+
+// WrapDoAPIError upgrades malformed JSON decode errors from the SDK into
+// actionable API errors for raw `lark-cli api` calls. All other failures
+// remain network errors.
+func WrapDoAPIError(err error) error {
+	if err == nil {
+		return nil
+	}
+	if isJSONDecodeError(err, false) {
+		return output.ErrWithHint(output.ExitAPI, "api_error",
+			fmt.Sprintf("API returned an invalid JSON response: %v", err), rawAPIJSONHint)
+	}
+	return output.ErrNetwork("API call failed: %v", err)
+}
+
+// WrapJSONResponseParseError upgrades empty or malformed JSON response bodies
+// into API errors with hints instead of generic parse failures.
+func WrapJSONResponseParseError(err error, body []byte) error {
+	if err == nil {
+		return nil
+	}
+	if len(bytes.TrimSpace(body)) == 0 {
+		return output.ErrWithHint(output.ExitAPI, "api_error",
+			"API returned an empty JSON response body", rawAPIJSONHint)
+	}
+	if isJSONDecodeError(err, true) {
+		return output.ErrWithHint(output.ExitAPI, "api_error",
+			fmt.Sprintf("API returned an invalid JSON response: %v", err), rawAPIJSONHint)
+	}
+	return output.ErrNetwork("API call failed: %v", err)
+}
+
+func isJSONDecodeError(err error, allowEOF bool) bool {
+	var syntaxErr *json.SyntaxError
+	var unmarshalTypeErr *json.UnmarshalTypeError
+
+	if errors.As(err, &syntaxErr) || errors.As(err, &unmarshalTypeErr) {
+		return true
+	}
+	if allowEOF && (errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF)) {
+		return true
+	}
+
+	msg := err.Error()
+	if allowEOF && strings.Contains(msg, "unexpected EOF") {
+		return true
+	}
+	return strings.Contains(msg, "unexpected end of JSON input") ||
+		strings.Contains(msg, "invalid character") ||
+		strings.Contains(msg, "cannot unmarshal")
+}

internal/client/api_errors_test.go

@@ -0,0 +1,68 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package client
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/internal/output"
+)
+
+func TestWrapDoAPIError_BareEOFIsNetworkError(t *testing.T) {
+	err := WrapDoAPIError(io.EOF)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected ExitError, got %T", err)
+	}
+	if exitErr.Code != output.ExitNetwork {
+		t.Fatalf("expected ExitNetwork, got %d", exitErr.Code)
+	}
+	if strings.Contains(exitErr.Error(), "invalid JSON response") {
+		t.Fatalf("unexpected JSON diagnostic for bare EOF: %q", exitErr.Error())
+	}
+}
+
+func TestWrapDoAPIError_SyntaxErrorIsAPIDiagnostic(t *testing.T) {
+	err := WrapDoAPIError(&json.SyntaxError{Offset: 1})
+	if err == nil {
+		t.Fatal("expected error")
+	}
+
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected ExitError, got %T", err)
+	}
+	if exitErr.Code != output.ExitAPI {
+		t.Fatalf("expected ExitAPI, got %d", exitErr.Code)
+	}
+	if exitErr.Detail == nil || !strings.Contains(exitErr.Detail.Message, "invalid JSON response") {
+		t.Fatalf("expected JSON diagnostic message, got %#v", exitErr.Detail)
+	}
+}
+
+func TestWrapJSONResponseParseError_UnexpectedEOFIsAPIDiagnostic(t *testing.T) {
+	err := WrapJSONResponseParseError(io.ErrUnexpectedEOF, []byte("{"))
+	if err == nil {
+		t.Fatal("expected error")
+	}
+
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected ExitError, got %T", err)
+	}
+	if exitErr.Code != output.ExitAPI {
+		t.Fatalf("expected ExitAPI, got %d", exitErr.Code)
+	}
+	if exitErr.Detail == nil || !strings.Contains(exitErr.Detail.Message, "invalid JSON response") {
+		t.Fatalf("expected invalid JSON diagnostic, got %#v", exitErr.Detail)
+	}
+}

internal/client/response.go

@@ -6,18 +6,17 @@ package client
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"mime"
-	"path/filepath"
 	"strings"
 
 	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
 
+	"github.com/larksuite/cli/extension/fileio"
 	"github.com/larksuite/cli/internal/output"
 	"github.com/larksuite/cli/internal/util"
-	"github.com/larksuite/cli/internal/validate"
-	"github.com/larksuite/cli/internal/vfs"
 )
 
 // ── Response routing ──
@@ -29,6 +28,7 @@ type ResponseOptions struct {
 	JqExpr     string        // if set, apply jq filter instead of Format
 	Out        io.Writer     // stdout
 	ErrOut     io.Writer     // stderr
+	FileIO     fileio.FileIO // file transfer abstraction; required when saving files (--output or binary response)
 	// CheckError is called on parsed JSON results. Nil defaults to CheckLarkResponse.
 	CheckError func(interface{}) error
 }
@@ -55,13 +55,13 @@ func HandleResponse(resp *larkcore.ApiResp, opts ResponseOptions) error {
 	if IsJSONContentType(ct) || ct == "" {
 		result, err := ParseJSONResponse(resp)
 		if err != nil {
-			return output.ErrNetwork("API call failed: %v", err)
+			return WrapJSONResponseParseError(err, resp.RawBody)
 		}
 		if apiErr := check(result); apiErr != nil {
 			return apiErr
 		}
 		if opts.OutputPath != "" {
-			return saveAndPrint(resp, opts.OutputPath, opts.Out)
+			return saveAndPrint(opts.FileIO, resp, opts.OutputPath, opts.Out)
 		}
 		if opts.JqExpr != "" {
 			return output.JqFilter(opts.Out, result, opts.JqExpr)
@@ -75,11 +75,11 @@ func HandleResponse(resp *larkcore.ApiResp, opts ResponseOptions) error {
 		return output.ErrValidation("--jq requires a JSON response (got Content-Type: %s)", ct)
 	}
 	if opts.OutputPath != "" {
-		return saveAndPrint(resp, opts.OutputPath, opts.Out)
+		return saveAndPrint(opts.FileIO, resp, opts.OutputPath, opts.Out)
 	}
 
 	// No --output: auto-save with derived filename.
-	meta, err := SaveResponse(resp, ResolveFilename(resp))
+	meta, err := SaveResponse(opts.FileIO, resp, ResolveFilename(resp))
 	if err != nil {
 		return output.Errorf(output.ExitInternal, "file_error", "%s", err)
 	}
@@ -88,8 +88,8 @@ func HandleResponse(resp *larkcore.ApiResp, opts ResponseOptions) error {
 	return nil
 }
 
-func saveAndPrint(resp *larkcore.ApiResp, path string, w io.Writer) error {
-	meta, err := SaveResponse(resp, path)
+func saveAndPrint(fio fileio.FileIO, resp *larkcore.ApiResp, path string, w io.Writer) error {
+	meta, err := SaveResponse(fio, resp, path)
 	if err != nil {
 		return output.Errorf(output.ExitInternal, "file_error", "%s", err)
 	}
@@ -111,7 +111,7 @@ func ParseJSONResponse(resp *larkcore.ApiResp) (interface{}, error) {
 	dec := json.NewDecoder(bytes.NewReader(resp.RawBody))
 	dec.UseNumber()
 	if err := dec.Decode(&result); err != nil {
-		return nil, fmt.Errorf("response parse error: %v (body: %s)", err, util.TruncateStr(string(resp.RawBody), 500))
+		return nil, fmt.Errorf("response parse error: %w (body: %s)", err, util.TruncateStr(string(resp.RawBody), 500))
 	}
 	return result, nil
 }
@@ -119,23 +119,34 @@ func ParseJSONResponse(resp *larkcore.ApiResp) (interface{}, error) {
 // ── File saving ──
 
 // SaveResponse writes an API response body to the given outputPath and returns metadata.
-func SaveResponse(resp *larkcore.ApiResp, outputPath string) (map[string]interface{}, error) {
-	safePath, err := validate.SafeOutputPath(outputPath)
+// It delegates to FileIO.Save for path validation and atomic write; fio must not be nil.
+func SaveResponse(fio fileio.FileIO, resp *larkcore.ApiResp, outputPath string) (map[string]interface{}, error) {
+	result, err := fio.Save(outputPath, fileio.SaveOptions{
+		ContentType:   resp.Header.Get("Content-Type"),
+		ContentLength: int64(len(resp.RawBody)),
+	}, bytes.NewReader(resp.RawBody))
 	if err != nil {
-		return nil, fmt.Errorf("unsafe output path: %s", err)
+		var me *fileio.MkdirError
+		var we *fileio.WriteError
+		switch {
+		case errors.Is(err, fileio.ErrPathValidation):
+			return nil, fmt.Errorf("unsafe output path: %s", err)
+		case errors.As(err, &me):
+			return nil, fmt.Errorf("create directory: %s", err)
+		case errors.As(err, &we):
+			return nil, fmt.Errorf("cannot write file: %s", err)
+		default:
+			return nil, fmt.Errorf("cannot write file: %s", err)
+		}
 	}
 
-	if err := vfs.MkdirAll(filepath.Dir(safePath), 0700); err != nil {
-		return nil, fmt.Errorf("create directory: %s", err)
+	resolvedPath, err := fio.ResolvePath(outputPath)
+	if err != nil || resolvedPath == "" {
+		resolvedPath = outputPath
 	}
-
-	if err := validate.AtomicWrite(safePath, resp.RawBody, 0644); err != nil {
-		return nil, fmt.Errorf("cannot write file: %s", err)
-	}
-
 	return map[string]interface{}{
-		"saved_path":   safePath,
-		"size_bytes":   len(resp.RawBody),
+		"saved_path":   resolvedPath,
+		"size_bytes":   result.Size(),
 		"content_type": resp.Header.Get("Content-Type"),
 	}, nil
 }

internal/client/response_test.go

@@ -6,6 +6,7 @@ package client
 import (
 	"bytes"
 	"errors"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -15,6 +16,7 @@ import (
 	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
 
 	"github.com/larksuite/cli/internal/output"
+	"github.com/larksuite/cli/internal/vfs/localfileio"
 )
 
 func newApiResp(body []byte, headers map[string]string) *larkcore.ApiResp {
@@ -75,6 +77,17 @@ func TestParseJSONResponse_Invalid(t *testing.T) {
 	}
 }
 
+func TestParseJSONResponse_EmptyBody_WrapsEOF(t *testing.T) {
+	resp := newApiResp([]byte{}, map[string]string{"Content-Type": "application/json"})
+	_, err := ParseJSONResponse(resp)
+	if err == nil {
+		t.Fatal("expected error for empty body")
+	}
+	if !errors.Is(err, io.EOF) {
+		t.Fatalf("expected wrapped io.EOF, got %v", err)
+	}
+}
+
 func TestResolveFilename(t *testing.T) {
 	tests := []struct {
 		name    string
@@ -150,11 +163,11 @@ func TestSaveResponse(t *testing.T) {
 	body := []byte("hello binary data")
 	resp := newApiResp(body, map[string]string{"Content-Type": "application/octet-stream"})
 
-	meta, err := SaveResponse(resp, "test_output.bin")
+	meta, err := SaveResponse(&localfileio.LocalFileIO{}, resp, "test_output.bin")
 	if err != nil {
 		t.Fatalf("SaveResponse failed: %v", err)
 	}
-	if meta["size_bytes"] != len(body) {
+	if meta["size_bytes"] != int64(len(body)) {
 		t.Errorf("expected size_bytes=%d, got %v", len(body), meta["size_bytes"])
 	}
 
@@ -176,7 +189,7 @@ func TestSaveResponse_CreatesDir(t *testing.T) {
 
 	resp := newApiResp([]byte("data"), map[string]string{"Content-Type": "application/octet-stream"})
 
-	meta, err := SaveResponse(resp, filepath.Join("sub", "deep", "out.bin"))
+	meta, err := SaveResponse(&localfileio.LocalFileIO{}, resp, filepath.Join("sub", "deep", "out.bin"))
 	if err != nil {
 		t.Fatalf("SaveResponse with nested dir failed: %v", err)
 	}
@@ -195,6 +208,7 @@ func TestHandleResponse_JSON(t *testing.T) {
 	err := HandleResponse(resp, ResponseOptions{
 		Out:    &out,
 		ErrOut: &errOut,
+		FileIO: &localfileio.LocalFileIO{},
 	})
 	if err != nil {
 		t.Fatalf("HandleResponse failed: %v", err)
@@ -213,12 +227,44 @@ func TestHandleResponse_JSONWithError(t *testing.T) {
 	err := HandleResponse(resp, ResponseOptions{
 		Out:    &out,
 		ErrOut: &errOut,
+		FileIO: &localfileio.LocalFileIO{},
 	})
 	if err == nil {
 		t.Error("expected error for non-zero code")
 	}
 }
 
+func TestHandleResponse_EmptyJSONBody_ShowsDiagnostic(t *testing.T) {
+	resp := newApiResp([]byte{}, map[string]string{"Content-Type": "application/json"})
+
+	var out bytes.Buffer
+	var errOut bytes.Buffer
+	err := HandleResponse(resp, ResponseOptions{
+		Out:    &out,
+		ErrOut: &errOut,
+	})
+	if err == nil {
+		t.Fatal("expected error for empty JSON body")
+	}
+
+	var exitErr *output.ExitError
+	if !errors.As(err, &exitErr) {
+		t.Fatalf("expected ExitError, got %T", err)
+	}
+	if exitErr.Code != output.ExitAPI {
+		t.Fatalf("expected ExitAPI, got %d", exitErr.Code)
+	}
+	if exitErr.Detail == nil {
+		t.Fatal("expected detail on exit error")
+	}
+	if exitErr.Detail.Message != "API returned an empty JSON response body" {
+		t.Fatalf("unexpected message: %q", exitErr.Detail.Message)
+	}
+	if !strings.Contains(exitErr.Detail.Hint, "--output") {
+		t.Fatalf("expected hint to mention --output, got %q", exitErr.Detail.Hint)
+	}
+}
+
 func TestHandleResponse_BinaryAutoSave(t *testing.T) {
 	dir := t.TempDir()
 	origWd, _ := os.Getwd()
@@ -232,6 +278,7 @@ func TestHandleResponse_BinaryAutoSave(t *testing.T) {
 	err := HandleResponse(resp, ResponseOptions{
 		Out:    &out,
 		ErrOut: &errOut,
+		FileIO: &localfileio.LocalFileIO{},
 	})
 	if err != nil {
 		t.Fatalf("HandleResponse binary failed: %v", err)
@@ -255,6 +302,7 @@ func TestHandleResponse_BinaryWithOutput(t *testing.T) {
 		OutputPath: "out.png",
 		Out:        &out,
 		ErrOut:     &errOut,
+		FileIO:     &localfileio.LocalFileIO{},
 	})
 	if err != nil {
 		t.Fatalf("HandleResponse with output path failed: %v", err)
@@ -269,7 +317,7 @@ func TestHandleResponse_NonJSONError_404(t *testing.T) {
 	resp := newApiRespWithStatus(404, []byte("404 page not found"), map[string]string{"Content-Type": "text/plain"})
 
 	var out, errOut bytes.Buffer
-	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut})
+	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut, FileIO: &localfileio.LocalFileIO{}})
 	if err == nil {
 		t.Fatal("expected error for 404 text/plain")
 	}
@@ -287,7 +335,7 @@ func TestHandleResponse_NonJSONError_502(t *testing.T) {
 	resp := newApiRespWithStatus(502, []byte("<html>Bad Gateway</html>"), map[string]string{"Content-Type": "text/html"})
 
 	var out, errOut bytes.Buffer
-	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut})
+	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut, FileIO: &localfileio.LocalFileIO{}})
 	if err == nil {
 		t.Fatal("expected error for 502 text/html")
 	}
@@ -310,7 +358,7 @@ func TestHandleResponse_200TextPlain_SavesFile(t *testing.T) {
 	resp := newApiRespWithStatus(200, []byte("plain text file content"), map[string]string{"Content-Type": "text/plain"})
 
 	var out, errOut bytes.Buffer
-	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut})
+	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut, FileIO: &localfileio.LocalFileIO{}})
 	if err != nil {
 		t.Fatalf("expected no error for 200 text/plain, got: %v", err)
 	}
@@ -336,12 +384,53 @@ func TestHandleResponse_BinaryWithJq_RejectsNonJSON(t *testing.T) {
 	}
 }
 
+func TestSaveResponse_RejectsPathTraversal(t *testing.T) {
+	dir := t.TempDir()
+	origWd, _ := os.Getwd()
+	os.Chdir(dir)
+	defer os.Chdir(origWd)
+
+	resp := newApiResp([]byte("data"), map[string]string{"Content-Type": "application/octet-stream"})
+	_, err := SaveResponse(&localfileio.LocalFileIO{}, resp, "../../evil.txt")
+	if err == nil {
+		t.Fatal("expected error for path traversal")
+	}
+	if !strings.Contains(err.Error(), "unsafe output path") {
+		t.Errorf("expected 'unsafe output path' wrapper, got: %v", err)
+	}
+}
+
+func TestSaveResponse_RejectsAbsolutePath(t *testing.T) {
+	resp := newApiResp([]byte("data"), map[string]string{"Content-Type": "application/octet-stream"})
+	_, err := SaveResponse(&localfileio.LocalFileIO{}, resp, "/tmp/evil.txt")
+	if err == nil {
+		t.Fatal("expected error for absolute path")
+	}
+}
+
+func TestSaveResponse_MetadataContainsAbsolutePath(t *testing.T) {
+	dir := t.TempDir()
+	origWd, _ := os.Getwd()
+	os.Chdir(dir)
+	defer os.Chdir(origWd)
+
+	resp := newApiResp([]byte("x"), map[string]string{"Content-Type": "text/plain"})
+	meta, err := SaveResponse(&localfileio.LocalFileIO{}, resp, "rel.txt")
+	if err != nil {
+		t.Fatalf("SaveResponse failed: %v", err)
+	}
+	savedPath, _ := meta["saved_path"].(string)
+	if !filepath.IsAbs(savedPath) {
+		t.Errorf("saved_path should be absolute, got %q", savedPath)
+	}
+}
+
 func TestHandleResponse_403JSON_CheckLarkResponse(t *testing.T) {
 	body := []byte(`{"code":99991400,"msg":"invalid token"}`)
 	resp := newApiRespWithStatus(403, body, map[string]string{"Content-Type": "application/json"})
 
 	var out, errOut bytes.Buffer
-	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut})
+	err := HandleResponse(resp, ResponseOptions{Out: &out, ErrOut: &errOut, FileIO: &localfileio.LocalFileIO{}})
 	if err == nil {
 		t.Fatal("expected error for 403 JSON with non-zero code")
 	}

internal/cmdutil/dryrun.go

@@ -215,6 +215,51 @@ func encodeParams(params map[string]interface{}) string {
 	return vals.Encode()
 }
 
+// PrintDryRunWithFile outputs a dry-run summary for file upload requests.
+// Instead of serializing the Formdata body, it shows file metadata.
+func PrintDryRunWithFile(w io.Writer, request client.RawApiRequest, config *core.CliConfig, format, fileField, filePath string, formFields any) error {
+	dr := NewDryRunAPI()
+	switch request.Method {
+	case "POST":
+		dr.POST(request.URL)
+	case "PUT":
+		dr.PUT(request.URL)
+	case "PATCH":
+		dr.PATCH(request.URL)
+	case "DELETE":
+		dr.DELETE(request.URL)
+	default:
+		dr.GET(request.URL)
+	}
+	if len(request.Params) > 0 {
+		dr.Params(request.Params)
+	}
+	filePathDisplay := filePath
+	if filePathDisplay == "" {
+		filePathDisplay = "<stdin>"
+	}
+	fileInfo := map[string]any{
+		"file": map[string]string{"field": fileField, "path": filePathDisplay},
+	}
+	if formFields != nil {
+		fileInfo["form_fields"] = formFields
+	}
+	fileInfo["options"] = []string{"WithFileUpload"}
+	dr.Body(fileInfo)
+	dr.Set("as", string(request.As))
+	dr.Set("appId", config.AppID)
+	if config.UserOpenId != "" {
+		dr.Set("userOpenId", config.UserOpenId)
+	}
+	fmt.Fprintln(w, "=== Dry Run ===")
+	if format == "pretty" {
+		fmt.Fprint(w, dr.Format())
+	} else {
+		output.PrintJson(w, dr)
+	}
+	return nil
+}
+
 // PrintDryRun outputs a standardised dry-run summary using DryRunAPI.
 // When format is "pretty", outputs human-readable text; otherwise JSON.
 func PrintDryRun(w io.Writer, request client.RawApiRequest, config *core.CliConfig, format string) error {

internal/cmdutil/factory.go

@@ -14,6 +14,7 @@ import (
 	"github.com/spf13/cobra"
 
 	extcred "github.com/larksuite/cli/extension/credential"
+	"github.com/larksuite/cli/extension/fileio"
 	"github.com/larksuite/cli/internal/client"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
@@ -40,6 +41,17 @@ type Factory struct {
 	ResolvedIdentity     core.Identity           // identity resolved by the last ResolveAs call
 
 	Credential *credential.CredentialProvider
+
+	FileIOProvider fileio.Provider // file transfer provider (default: local filesystem)
+}
+
+// ResolveFileIO resolves a FileIO instance using the current execution context.
+// The provider controls whether the returned instance is fresh or cached.
+func (f *Factory) ResolveFileIO(ctx context.Context) fileio.FileIO {
+	if f == nil || f.FileIOProvider == nil {
+		return nil
+	}
+	return f.FileIOProvider.ResolveFileIO(ctx)
 }
 
 // ResolveAs returns the effective identity type.

internal/cmdutil/factory_default.go

@@ -17,12 +17,14 @@ import (
 	"golang.org/x/term"
 
 	extcred "github.com/larksuite/cli/extension/credential"
+	"github.com/larksuite/cli/extension/fileio"
 	"github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/keychain"
 	"github.com/larksuite/cli/internal/registry"
 	"github.com/larksuite/cli/internal/util"
+	_ "github.com/larksuite/cli/internal/vfs/localfileio" // register default FileIO provider
 )
 
 // NewDefault creates a production Factory with cached closures.
@@ -44,6 +46,9 @@ func NewDefault(inv InvocationContext) *Factory {
 		IsTerminal: term.IsTerminal(int(os.Stdin.Fd())),
 	}
 
+	// Phase 0: FileIO provider (no dependency)
+	f.FileIOProvider = fileio.GetProvider()
+
 	// Phase 1: HttpClient (no credential dependency)
 	f.HttpClient = cachedHttpClientFunc()
 

internal/cmdutil/factory_default_test.go

@@ -11,13 +11,26 @@ import (
 	"testing"
 
 	_ "github.com/larksuite/cli/extension/credential/env"
+	"github.com/larksuite/cli/extension/fileio"
 	exttransport "github.com/larksuite/cli/extension/transport"
 	internalauth "github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/envvars"
+	"github.com/larksuite/cli/internal/vfs/localfileio"
 )
 
+type countingFileIOProvider struct {
+	resolveCalls int
+}
+
+func (p *countingFileIOProvider) Name() string { return "counting" }
+
+func (p *countingFileIOProvider) ResolveFileIO(context.Context) fileio.FileIO {
+	p.resolveCalls++
+	return &localfileio.LocalFileIO{}
+}
+
 func TestNewDefault_InvocationProfileUsedByStrictModeAndConfig(t *testing.T) {
 	t.Setenv(envvars.CliAppID, "")
 	t.Setenv(envvars.CliAppSecret, "")
@@ -198,6 +211,28 @@ func TestNewDefault_ConfigUsesRuntimePlaceholderForTokenOnlyEnvAccount(t *testin
 	}
 }
 
+func TestNewDefault_FileIOProviderDoesNotResolveDuringInitialization(t *testing.T) {
+	prev := fileio.GetProvider()
+	provider := &countingFileIOProvider{}
+	fileio.Register(provider)
+	t.Cleanup(func() { fileio.Register(prev) })
+
+	f := NewDefault(InvocationContext{})
+	if f.FileIOProvider != provider {
+		t.Fatalf("NewDefault() provider = %T, want %T", f.FileIOProvider, provider)
+	}
+	if provider.resolveCalls != 0 {
+		t.Fatalf("ResolveFileIO() calls after NewDefault() = %d, want 0", provider.resolveCalls)
+	}
+
+	if got := f.ResolveFileIO(context.Background()); got == nil {
+		t.Fatal("ResolveFileIO() = nil, want non-nil")
+	}
+	if provider.resolveCalls != 1 {
+		t.Fatalf("ResolveFileIO() calls after explicit resolve = %d, want 1", provider.resolveCalls)
+	}
+}
+
 type stubTransportProvider struct {
 	interceptor exttransport.Interceptor
 }

internal/cmdutil/fileupload.go

@@ -0,0 +1,130 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/larksuite/cli/extension/fileio"
+	"github.com/larksuite/cli/internal/output"
+	"github.com/larksuite/cli/internal/registry"
+	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
+)
+
+// DetectFileFields returns field names with type "file" in the method's requestBody.
+func DetectFileFields(method map[string]interface{}) []string {
+	rb, _ := method["requestBody"].(map[string]interface{})
+	var fields []string
+	for name, field := range rb {
+		f, _ := field.(map[string]interface{})
+		if registry.GetStrFromMap(f, "type") == "file" {
+			fields = append(fields, name)
+		}
+	}
+	return fields
+}
+
+// ParseFileFlag parses a --file flag value into its components.
+// The format is either "path" or "field=path". When no explicit "field="
+// prefix is present, defaultField is used as the field name.
+// A path of "-" indicates stdin; in that case filePath is empty and isStdin is true.
+func ParseFileFlag(raw, defaultField string) (fieldName, filePath string, isStdin bool) {
+	if idx := strings.IndexByte(raw, '='); idx > 0 {
+		fieldName = raw[:idx]
+		filePath = raw[idx+1:]
+	} else {
+		fieldName = defaultField
+		filePath = raw
+	}
+	if filePath == "-" {
+		return fieldName, "", true
+	}
+	return fieldName, filePath, false
+}
+
+// ValidateFileFlag checks mutual exclusion rules for the --file flag.
+// Returns nil if file is empty (flag not provided).
+func ValidateFileFlag(file, params, data, outputPath string, pageAll bool, httpMethod string) error {
+	if file == "" {
+		return nil
+	}
+
+	_, filePath, isStdin := ParseFileFlag(file, "file")
+	if !isStdin && filePath == "" {
+		return output.ErrValidation("--file: empty file path")
+	}
+
+	if outputPath != "" {
+		return output.ErrValidation("--file and --output are mutually exclusive")
+	}
+	if pageAll {
+		return output.ErrValidation("--file and --page-all are mutually exclusive")
+	}
+	if isStdin && data == "-" {
+		return output.ErrValidation("--file and --data cannot both read from stdin")
+	}
+	if isStdin && params == "-" {
+		return output.ErrValidation("--file and --params cannot both read from stdin")
+	}
+
+	switch httpMethod {
+	case "POST", "PUT", "PATCH", "DELETE":
+	default:
+		return output.ErrValidation("--file requires POST, PUT, PATCH, or DELETE method")
+	}
+
+	return nil
+}
+
+// FileUploadMeta holds file upload metadata for dry-run display.
+// Returned by request builders when dry-run mode skips actual file reading.
+type FileUploadMeta struct {
+	FieldName  string
+	FilePath   string
+	FormFields any
+}
+
+// BuildFormdata constructs a multipart form data payload for file upload.
+// If isStdin is true, the file content is read from stdin.
+// Top-level keys from dataJSON are added as text form fields.
+func BuildFormdata(fileIO fileio.FileIO, fieldName, filePath string, isStdin bool, stdin io.Reader, dataJSON any) (*larkcore.Formdata, error) {
+	fd := larkcore.NewFormdata()
+
+	if isStdin {
+		if stdin == nil {
+			return nil, output.ErrValidation("--file: stdin is not available")
+		}
+		data, err := io.ReadAll(stdin)
+		if err != nil {
+			return nil, output.ErrValidation("--file: failed to read stdin: %v", err)
+		}
+		if len(data) == 0 {
+			return nil, output.ErrValidation("--file: stdin is empty")
+		}
+		fd.AddFile(fieldName, bytes.NewReader(data))
+	} else {
+		f, err := fileIO.Open(filePath)
+		if err != nil {
+			return nil, output.ErrValidation("cannot open file: %s", filePath)
+		}
+		defer f.Close()
+		data, err := io.ReadAll(f)
+		if err != nil {
+			return nil, output.ErrValidation("--file: failed to read %s: %v", filePath, err)
+		}
+		fd.AddFile(fieldName, bytes.NewReader(data))
+	}
+
+	// Add top-level JSON keys as text form fields.
+	if m, ok := dataJSON.(map[string]any); ok {
+		for k, v := range m {
+			fd.AddField(k, fmt.Sprintf("%v", v))
+		}
+	}
+
+	return fd, nil
+}

internal/cmdutil/fileupload_test.go

@@ -0,0 +1,338 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/internal/vfs/localfileio"
+)
+
+func TestParseFileFlag(t *testing.T) {
+	tests := []struct {
+		name         string
+		raw          string
+		defaultField string
+		wantField    string
+		wantPath     string
+		wantStdin    bool
+	}{
+		{
+			name:         "simple filename uses default field",
+			raw:          "photo.jpg",
+			defaultField: "file",
+			wantField:    "file",
+			wantPath:     "photo.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "simple filename with custom default",
+			raw:          "photo.jpg",
+			defaultField: "image",
+			wantField:    "image",
+			wantPath:     "photo.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "explicit field prefix",
+			raw:          "image=photo.jpg",
+			defaultField: "file",
+			wantField:    "image",
+			wantPath:     "photo.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "stdin bare",
+			raw:          "-",
+			defaultField: "file",
+			wantField:    "file",
+			wantPath:     "",
+			wantStdin:    true,
+		},
+		{
+			name:         "stdin with field prefix",
+			raw:          "image=-",
+			defaultField: "file",
+			wantField:    "image",
+			wantPath:     "",
+			wantStdin:    true,
+		},
+		{
+			name:         "path with equals sign (only first equals splits)",
+			raw:          "field=path/to/file=1.jpg",
+			defaultField: "file",
+			wantField:    "field",
+			wantPath:     "path/to/file=1.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "absolute path no prefix",
+			raw:          "/tmp/photo.jpg",
+			defaultField: "file",
+			wantField:    "file",
+			wantPath:     "/tmp/photo.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "absolute path with field prefix",
+			raw:          "image=/tmp/photo.jpg",
+			defaultField: "file",
+			wantField:    "image",
+			wantPath:     "/tmp/photo.jpg",
+			wantStdin:    false,
+		},
+		{
+			name:         "empty field prefix falls through to default",
+			raw:          "=photo.jpg",
+			defaultField: "file",
+			wantField:    "file",
+			wantPath:     "=photo.jpg",
+			wantStdin:    false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			field, path, isStdin := ParseFileFlag(tt.raw, tt.defaultField)
+			if field != tt.wantField {
+				t.Errorf("field = %q, want %q", field, tt.wantField)
+			}
+			if path != tt.wantPath {
+				t.Errorf("path = %q, want %q", path, tt.wantPath)
+			}
+			if isStdin != tt.wantStdin {
+				t.Errorf("isStdin = %v, want %v", isStdin, tt.wantStdin)
+			}
+		})
+	}
+}
+
+func TestValidateFileFlag(t *testing.T) {
+	tests := []struct {
+		name       string
+		file       string
+		params     string
+		data       string
+		outputPath string
+		pageAll    bool
+		httpMethod string
+		wantErr    string // empty means no error
+	}{
+		{
+			name:       "empty file is valid",
+			file:       "",
+			httpMethod: "GET",
+			wantErr:    "",
+		},
+		{
+			name:       "empty file path",
+			file:       "field=",
+			httpMethod: "POST",
+			wantErr:    "--file: empty file path",
+		},
+		{
+			name:       "file with output",
+			file:       "photo.jpg",
+			outputPath: "out.json",
+			httpMethod: "POST",
+			wantErr:    "--file and --output are mutually exclusive",
+		},
+		{
+			name:       "file with page-all",
+			file:       "photo.jpg",
+			pageAll:    true,
+			httpMethod: "POST",
+			wantErr:    "--file and --page-all are mutually exclusive",
+		},
+		{
+			name:       "stdin file with stdin data",
+			file:       "-",
+			data:       "-",
+			httpMethod: "POST",
+			wantErr:    "--file and --data cannot both read from stdin",
+		},
+		{
+			name:       "stdin file with stdin params",
+			file:       "-",
+			params:     "-",
+			httpMethod: "POST",
+			wantErr:    "--file and --params cannot both read from stdin",
+		},
+		{
+			name:       "file with GET method",
+			file:       "photo.jpg",
+			httpMethod: "GET",
+			wantErr:    "--file requires POST, PUT, PATCH, or DELETE method",
+		},
+		{
+			name:       "file with POST method",
+			file:       "photo.jpg",
+			httpMethod: "POST",
+			wantErr:    "",
+		},
+		{
+			name:       "file with PUT method",
+			file:       "photo.jpg",
+			httpMethod: "PUT",
+			wantErr:    "",
+		},
+		{
+			name:       "file with PATCH method",
+			file:       "photo.jpg",
+			httpMethod: "PATCH",
+			wantErr:    "",
+		},
+		{
+			name:       "file with DELETE method",
+			file:       "photo.jpg",
+			httpMethod: "DELETE",
+			wantErr:    "",
+		},
+		{
+			name:       "stdin with field prefix and data stdin",
+			file:       "image=-",
+			data:       "-",
+			httpMethod: "POST",
+			wantErr:    "--file and --data cannot both read from stdin",
+		},
+		{
+			name:       "stdin with field prefix and params stdin",
+			file:       "image=-",
+			params:     "-",
+			httpMethod: "POST",
+			wantErr:    "--file and --params cannot both read from stdin",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := ValidateFileFlag(tt.file, tt.params, tt.data, tt.outputPath, tt.pageAll, tt.httpMethod)
+			if tt.wantErr == "" {
+				if err != nil {
+					t.Errorf("unexpected error: %v", err)
+				}
+				return
+			}
+			if err == nil {
+				t.Fatalf("expected error containing %q, got nil", tt.wantErr)
+			}
+			if !strings.Contains(err.Error(), tt.wantErr) {
+				t.Errorf("error = %q, want containing %q", err.Error(), tt.wantErr)
+			}
+		})
+	}
+}
+
+func TestBuildFormdata(t *testing.T) {
+	fio := &localfileio.LocalFileIO{}
+
+	t.Run("stdin success", func(t *testing.T) {
+		stdin := bytes.NewReader([]byte("file-content-here"))
+		fd, err := BuildFormdata(fio, "file", "", true, stdin, nil)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if fd == nil {
+			t.Fatal("expected non-nil Formdata")
+		}
+	})
+
+	t.Run("stdin nil reader", func(t *testing.T) {
+		_, err := BuildFormdata(fio, "file", "", true, nil, nil)
+		if err == nil {
+			t.Fatal("expected error for nil stdin")
+		}
+		if !strings.Contains(err.Error(), "stdin is not available") {
+			t.Errorf("error = %q, want containing %q", err.Error(), "stdin is not available")
+		}
+	})
+
+	t.Run("stdin empty", func(t *testing.T) {
+		stdin := bytes.NewReader([]byte{})
+		_, err := BuildFormdata(fio, "file", "", true, stdin, nil)
+		if err == nil {
+			t.Fatal("expected error for empty stdin")
+		}
+		if !strings.Contains(err.Error(), "stdin is empty") {
+			t.Errorf("error = %q, want containing %q", err.Error(), "stdin is empty")
+		}
+	})
+
+	t.Run("file open success", func(t *testing.T) {
+		dir := t.TempDir()
+		TestChdir(t, dir)
+
+		if err := os.WriteFile(filepath.Join(dir, "test.txt"), []byte("hello"), 0600); err != nil {
+			t.Fatalf("failed to create test file: %v", err)
+		}
+
+		fd, err := BuildFormdata(fio, "photo", "test.txt", false, nil, nil)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if fd == nil {
+			t.Fatal("expected non-nil Formdata")
+		}
+	})
+
+	t.Run("file not found", func(t *testing.T) {
+		dir := t.TempDir()
+		TestChdir(t, dir)
+
+		_, err := BuildFormdata(fio, "file", "nonexistent.txt", false, nil, nil)
+		if err == nil {
+			t.Fatal("expected error for missing file")
+		}
+		if !strings.Contains(err.Error(), "cannot open file:") {
+			t.Errorf("error = %q, want containing %q", err.Error(), "cannot open file:")
+		}
+	})
+
+	t.Run("dataJSON fields added", func(t *testing.T) {
+		dir := t.TempDir()
+		TestChdir(t, dir)
+
+		if err := os.WriteFile(filepath.Join(dir, "upload.bin"), []byte("data"), 0600); err != nil {
+			t.Fatalf("failed to create test file: %v", err)
+		}
+
+		dataJSON := map[string]any{
+			"file_name":   "report.pdf",
+			"parent_type": "doc_image",
+			"size":        1024,
+		}
+
+		fd, err := BuildFormdata(fio, "file", "upload.bin", false, nil, dataJSON)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if fd == nil {
+			t.Fatal("expected non-nil Formdata")
+		}
+	})
+
+	t.Run("dataJSON nil is fine", func(t *testing.T) {
+		stdin := bytes.NewReader([]byte("content"))
+		fd, err := BuildFormdata(fio, "file", "", true, stdin, nil)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if fd == nil {
+			t.Fatal("expected non-nil Formdata")
+		}
+	})
+
+	t.Run("dataJSON non-map is ignored", func(t *testing.T) {
+		stdin := bytes.NewReader([]byte("content"))
+		fd, err := BuildFormdata(fio, "file", "", true, stdin, "not-a-map")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if fd == nil {
+			t.Fatal("expected non-nil Formdata")
+		}
+	})
+}

internal/cmdutil/json.go

@@ -5,35 +5,46 @@ package cmdutil
 
 import (
 	"encoding/json"
+	"io"
 
 	"github.com/larksuite/cli/internal/output"
 )
 
 // ParseOptionalBody parses --data JSON for methods that accept a request body.
+// Supports stdin (-) and single-quote stripping via ResolveInput.
 // Returns (nil, nil) if the method has no body or data is empty.
-func ParseOptionalBody(httpMethod, data string) (interface{}, error) {
+func ParseOptionalBody(httpMethod, data string, stdin io.Reader) (interface{}, error) {
 	switch httpMethod {
 	case "POST", "PUT", "PATCH", "DELETE":
 	default:
 		return nil, nil
 	}
-	if data == "" {
+	resolved, err := ResolveInput(data, stdin)
+	if err != nil {
+		return nil, output.ErrValidation("--data: %s", err)
+	}
+	if resolved == "" {
 		return nil, nil
 	}
 	var body interface{}
-	if err := json.Unmarshal([]byte(data), &body); err != nil {
+	if err := json.Unmarshal([]byte(resolved), &body); err != nil {
 		return nil, output.ErrValidation("--data invalid JSON format")
 	}
 	return body, nil
 }
 
 // ParseJSONMap parses a JSON string into a map. Returns an empty map if input is empty.
-func ParseJSONMap(input, label string) (map[string]any, error) {
-	if input == "" {
+// Supports stdin (-) and single-quote stripping via ResolveInput.
+func ParseJSONMap(input, label string, stdin io.Reader) (map[string]any, error) {
+	resolved, err := ResolveInput(input, stdin)
+	if err != nil {
+		return nil, output.ErrValidation("%s: %s", label, err)
+	}
+	if resolved == "" {
 		return map[string]any{}, nil
 	}
 	var result map[string]any
-	if err := json.Unmarshal([]byte(input), &result); err != nil {
+	if err := json.Unmarshal([]byte(resolved), &result); err != nil {
 		return nil, output.ErrValidation("%s invalid format, expected JSON object", label)
 	}
 	return result, nil

internal/cmdutil/json_test.go

@@ -23,7 +23,7 @@ func TestParseOptionalBody(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := ParseOptionalBody(tt.method, tt.data)
+			got, err := ParseOptionalBody(tt.method, tt.data, nil)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("ParseOptionalBody() error = %v, wantErr %v", err, tt.wantErr)
 				return
@@ -53,7 +53,7 @@ func TestParseJSONMap(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := ParseJSONMap(tt.input, tt.label)
+			got, err := ParseJSONMap(tt.input, tt.label, nil)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("ParseJSONMap() error = %v, wantErr %v", err, tt.wantErr)
 				return

internal/cmdutil/resolve.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+// ResolveInput resolves special input conventions for a raw flag value:
+//   - "-"      → read all bytes from stdin
+//   - "'...'"  → strip surrounding single quotes (Windows cmd.exe compatibility)
+//   - other    → return as-is
+//
+// This allows callers to bypass shell quoting issues (especially on Windows
+// PowerShell) by piping JSON via stdin instead of command-line arguments.
+func ResolveInput(raw string, stdin io.Reader) (string, error) {
+	if raw == "" {
+		return "", nil
+	}
+
+	// stdin
+	if raw == "-" {
+		if stdin == nil {
+			return "", fmt.Errorf("stdin is not available")
+		}
+		data, err := io.ReadAll(stdin)
+		if err != nil {
+			return "", fmt.Errorf("failed to read stdin: %w", err)
+		}
+		s := strings.TrimSpace(string(data))
+		if s == "" {
+			return "", fmt.Errorf("stdin is empty (did you forget to pipe input?)")
+		}
+		return s, nil
+	}
+
+	// strip surrounding single quotes (Windows cmd.exe passes them literally)
+	if len(raw) >= 2 && raw[0] == '\'' && raw[len(raw)-1] == '\'' {
+		raw = raw[1 : len(raw)-1]
+	}
+
+	return raw, nil
+}

internal/cmdutil/resolve_test.go

@@ -0,0 +1,189 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestResolveInput_Stdin(t *testing.T) {
+	got, err := ResolveInput("-", strings.NewReader(`{"key":"value"}`))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != `{"key":"value"}` {
+		t.Errorf("got %q, want %q", got, `{"key":"value"}`)
+	}
+}
+
+func TestResolveInput_Stdin_TrimNewline(t *testing.T) {
+	got, err := ResolveInput("-", strings.NewReader("{\"k\":\"v\"}\n"))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != `{"k":"v"}` {
+		t.Errorf("got %q, want %q", got, `{"k":"v"}`)
+	}
+}
+
+func TestResolveInput_Stdin_Empty(t *testing.T) {
+	_, err := ResolveInput("-", strings.NewReader(""))
+	if err == nil {
+		t.Error("expected error for empty stdin")
+	}
+	if !strings.Contains(err.Error(), "stdin is empty") {
+		t.Errorf("expected 'stdin is empty' error, got: %v", err)
+	}
+}
+
+type errorReader struct{}
+
+func (errorReader) Read([]byte) (int, error) { return 0, fmt.Errorf("disk failure") }
+
+func TestResolveInput_Stdin_ReadError(t *testing.T) {
+	_, err := ResolveInput("-", errorReader{})
+	if err == nil || !strings.Contains(err.Error(), "failed to read stdin") {
+		t.Errorf("expected read error, got: %v", err)
+	}
+}
+
+func TestResolveInput_Stdin_WhitespaceOnly(t *testing.T) {
+	_, err := ResolveInput("-", strings.NewReader("  \n\t\n  "))
+	if err == nil {
+		t.Error("expected error for whitespace-only stdin")
+	}
+}
+
+func TestResolveInput_Stdin_Nil(t *testing.T) {
+	_, err := ResolveInput("-", nil)
+	if err == nil {
+		t.Error("expected error for nil stdin")
+	}
+}
+
+func TestResolveInput_StripSingleQuotes(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"cmd.exe JSON", `'{"key":"value"}'`, `{"key":"value"}`},
+		{"cmd.exe empty", `'{}'`, `{}`},
+		{"no quotes", `{"key":"value"}`, `{"key":"value"}`},
+		{"just quotes", `''`, ``},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ResolveInput(tt.in, nil)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if got != tt.want {
+				t.Errorf("got %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestResolveInput_Empty(t *testing.T) {
+	got, err := ResolveInput("", nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "" {
+		t.Errorf("got %q, want empty", got)
+	}
+}
+
+func TestResolveInput_PlainValue(t *testing.T) {
+	got, err := ResolveInput(`{"already":"valid"}`, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != `{"already":"valid"}` {
+		t.Errorf("got %q, want %q", got, `{"already":"valid"}`)
+	}
+}
+
+func TestResolveInput_AtPrefixPassedThrough(t *testing.T) {
+	// Without @file support, @-prefixed values are passed as-is
+	got, err := ResolveInput("@something", nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "@something" {
+		t.Errorf("got %q, want %q", got, "@something")
+	}
+}
+
+// Integration: ResolveInput flows through ParseJSONMap correctly.
+func TestParseJSONMap_WithStdin(t *testing.T) {
+	stdin := strings.NewReader(`{"message_id":"om_xxx","user_id_type":"open_id"}`)
+	got, err := ParseJSONMap("-", "--params", stdin)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(got) != 2 {
+		t.Errorf("got %d keys, want 2", len(got))
+	}
+}
+
+func TestParseJSONMap_StripSingleQuotes_CmdExe(t *testing.T) {
+	got, err := ParseJSONMap(`'{"key":"value"}'`, "--params", nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got["key"] != "value" {
+		t.Errorf("got %v, want key=value", got)
+	}
+}
+
+func TestParseOptionalBody_WithStdin(t *testing.T) {
+	stdin := strings.NewReader(`{"text":"hello"}`)
+	got, err := ParseOptionalBody("POST", "-", stdin)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got == nil {
+		t.Fatal("expected non-nil body")
+	}
+	m, ok := got.(map[string]interface{})
+	if !ok {
+		t.Fatalf("expected map, got %T", got)
+	}
+	if m["text"] != "hello" {
+		t.Errorf("got %v, want text=hello", m)
+	}
+}
+
+// Simulates exact strings Go receives on different Windows shells.
+func TestParseJSONMap_WindowsShellScenarios(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		wantLen int
+		wantErr bool
+	}{
+		{"bash: normal JSON", `{"a":"1","b":"2"}`, 2, false},
+		{"cmd.exe: single-quoted", `'{"a":"1","b":"2"}'`, 2, false}, // strip ' fix
+		{"PS 5.x: mangled", `{a:1,b:2}`, 0, true},                   // unrecoverable
+		{"PS 5.x: empty JSON OK", `{}`, 0, false},                   // no inner "
+		{"PS 7.3+: normal JSON", `{"a":"1"}`, 1, false},             // already fixed
+		{"PS escaped: correct", `{"a":"1"}`, 1, false},              // after CommandLineToArgvW
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ParseJSONMap(tt.input, "--params", nil)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !tt.wantErr && len(got) != tt.wantLen {
+				t.Errorf("got %d keys, want %d", len(got), tt.wantLen)
+			}
+		})
+	}
+}

internal/cmdutil/testing.go

@@ -7,14 +7,17 @@ import (
 	"bytes"
 	"context"
 	"net/http"
+	"os"
 	"testing"
 
 	lark "github.com/larksuite/oapi-sdk-go/v3"
 	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
 
+	"github.com/larksuite/cli/extension/fileio"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/httpmock"
+	"github.com/larksuite/cli/internal/vfs"
 )
 
 // noopKeychain is a no-op KeychainAccess for tests that don't need keychain.
@@ -62,12 +65,13 @@ func TestFactory(t *testing.T, config *core.CliConfig) (*Factory, *bytes.Buffer,
 	)
 
 	f := &Factory{
-		Config:     func() (*core.CliConfig, error) { return config, nil },
-		HttpClient: func() (*http.Client, error) { return mockClient, nil },
-		LarkClient: func() (*lark.Client, error) { return testLarkClient, nil },
-		IOStreams:  &IOStreams{In: nil, Out: stdoutBuf, ErrOut: stderrBuf},
-		Keychain:   &noopKeychain{},
-		Credential: testCred,
+		Config:         func() (*core.CliConfig, error) { return config, nil },
+		HttpClient:     func() (*http.Client, error) { return mockClient, nil },
+		LarkClient:     func() (*lark.Client, error) { return testLarkClient, nil },
+		IOStreams:      &IOStreams{In: nil, Out: stdoutBuf, ErrOut: stderrBuf},
+		Keychain:       &noopKeychain{},
+		Credential:     testCred,
+		FileIOProvider: fileio.GetProvider(),
 	}
 	return f, stdoutBuf, stderrBuf, reg
 }
@@ -83,6 +87,23 @@ func (a *testDefaultAcct) ResolveAccount(ctx context.Context) (*credential.Accou
 	return credential.AccountFromCliConfig(a.config), nil
 }
 
+// TestChdir changes the working directory to dir for the duration of the test.
+// The original directory is restored via t.Cleanup.
+// This enables tests to use LocalFileIO (which resolves relative paths under cwd)
+// with temporary directories, keeping test artifacts out of the source tree.
+// Not compatible with t.Parallel() — os.Chdir is process-wide.
+func TestChdir(t *testing.T, dir string) {
+	t.Helper()
+	orig, err := vfs.Getwd()
+	if err != nil {
+		t.Fatalf("Getwd: %v", err)
+	}
+	if err := os.Chdir(dir); err != nil { //nolint:forbidigo // no vfs.Chdir yet; test-only, process-wide chdir
+		t.Fatalf("Chdir(%s): %v", dir, err)
+	}
+	t.Cleanup(func() { os.Chdir(orig) }) //nolint:forbidigo // matching restore
+}
+
 type testDefaultToken struct{}
 
 func (t *testDefaultToken) ResolveToken(ctx context.Context, req credential.TokenSpec) (*credential.TokenResult, error) {

internal/core/config.go

@@ -163,6 +163,16 @@ type CliConfig struct {
 	SupportedIdentities uint8 `json:"-"` // bitflag: 1=user, 2=bot; set by credential provider
 }
 
+// identityBotBit is the bit flag for bot identity in SupportedIdentities.
+// Must match extension/credential.SupportsBot.
+const identityBotBit uint8 = 1 << 1
+
+// CanBot reports whether the current credential context supports bot identity.
+// Returns true when SupportedIdentities is unset (0, unknown) or includes the bot bit.
+func (c *CliConfig) CanBot() bool {
+	return c.SupportedIdentities == 0 || c.SupportedIdentities&identityBotBit != 0
+}
+
 // GetConfigDir returns the config directory path.
 // If the home directory cannot be determined, it falls back to a relative path
 // and prints a warning to stderr.
@@ -240,6 +250,12 @@ func ResolveConfigFromMulti(raw *MultiAppConfig, kc keychain.KeychainAccess, pro
 		}
 	}
 
+	if err := ValidateSecretKeyMatch(app.AppId, app.AppSecret); err != nil {
+		return nil, &ConfigError{Code: 2, Type: "config",
+			Message: "appId and appSecret keychain key are out of sync",
+			Hint:    err.Error()}
+	}
+
 	secret, err := ResolveSecretInput(app.AppSecret, kc)
 	if err != nil {
 		// If the error comes from the keychain, it will already be wrapped as an ExitError.

internal/core/config_test.go

@@ -5,9 +5,21 @@ package core
 
 import (
 	"encoding/json"
+	"errors"
 	"testing"
+
+	"github.com/larksuite/cli/internal/keychain"
 )
 
+// stubKeychain is a minimal KeychainAccess that always returns ErrNotFound.
+type stubKeychain struct{}
+
+func (stubKeychain) Get(service, account string) (string, error) {
+	return "", keychain.ErrNotFound
+}
+func (stubKeychain) Set(service, account, value string) error { return nil }
+func (stubKeychain) Remove(service, account string) error     { return nil }
+
 func TestAppConfig_LangSerialization(t *testing.T) {
 	app := AppConfig{
 		AppId: "cli_test", AppSecret: PlainSecret("secret"),
@@ -73,6 +85,85 @@ func TestMultiAppConfig_RoundTrip(t *testing.T) {
 	}
 }
 
+func TestResolveConfigFromMulti_RejectsSecretKeyMismatch(t *testing.T) {
+	raw := &MultiAppConfig{
+		Apps: []AppConfig{
+			{
+				AppId: "cli_new_app",
+				AppSecret: SecretInput{Ref: &SecretRef{
+					Source: "keychain",
+					ID:     "appsecret:cli_old_app",
+				}},
+				Brand: BrandFeishu,
+			},
+		},
+	}
+
+	_, err := ResolveConfigFromMulti(raw, nil, "")
+	if err == nil {
+		t.Fatal("expected error for mismatched appId and appSecret keychain key")
+	}
+	var cfgErr *ConfigError
+	if !errors.As(err, &cfgErr) {
+		t.Fatalf("expected ConfigError, got %T: %v", err, err)
+	}
+	if cfgErr.Hint == "" {
+		t.Error("expected non-empty hint in ConfigError")
+	}
+}
+
+func TestResolveConfigFromMulti_AcceptsPlainSecret(t *testing.T) {
+	raw := &MultiAppConfig{
+		Apps: []AppConfig{
+			{
+				AppId:     "cli_abc",
+				AppSecret: PlainSecret("my-secret"),
+				Brand:     BrandFeishu,
+			},
+		},
+	}
+
+	cfg, err := ResolveConfigFromMulti(raw, nil, "")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if cfg.AppID != "cli_abc" {
+		t.Errorf("AppID = %q, want %q", cfg.AppID, "cli_abc")
+	}
+}
+
+func TestResolveConfigFromMulti_MatchingKeychainRefPassesValidation(t *testing.T) {
+	// Keychain ref matches appId, so validation passes.
+	// The subsequent ResolveSecretInput will fail (no real keychain),
+	// but that proves the mismatch check itself passed.
+	raw := &MultiAppConfig{
+		Apps: []AppConfig{
+			{
+				AppId: "cli_abc",
+				AppSecret: SecretInput{Ref: &SecretRef{
+					Source: "keychain",
+					ID:     "appsecret:cli_abc",
+				}},
+				Brand: BrandFeishu,
+			},
+		},
+	}
+
+	_, err := ResolveConfigFromMulti(raw, stubKeychain{}, "")
+	if err == nil {
+		// stubKeychain returns ErrNotFound, so we expect a keychain error,
+		// but NOT a mismatch error — that's the point of this test.
+		t.Fatal("expected error (keychain entry not found), got nil")
+	}
+	// The error should come from keychain resolution, NOT from our mismatch check.
+	var cfgErr *ConfigError
+	if errors.As(err, &cfgErr) {
+		if cfgErr.Message == "appId and appSecret keychain key are out of sync" {
+			t.Fatal("error came from mismatch check, but keys should match")
+		}
+	}
+}
+
 func TestResolveConfigFromMulti_DoesNotUseEnvProfileFallback(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_PROFILE", "missing")
 
@@ -96,3 +187,24 @@ func TestResolveConfigFromMulti_DoesNotUseEnvProfileFallback(t *testing.T) {
 		t.Fatalf("ResolveConfigFromMulti() profile = %q, want %q", cfg.ProfileName, "active")
 	}
 }
+
+func TestCliConfig_CanBot(t *testing.T) {
+	tests := []struct {
+		name                string
+		supportedIdentities uint8
+		want                bool
+	}{
+		{"unset (0) defaults to true", 0, true},
+		{"user only", 1, false},
+		{"bot only", 2, true},
+		{"both", 3, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := &CliConfig{SupportedIdentities: tt.supportedIdentities}
+			if got := cfg.CanBot(); got != tt.want {
+				t.Errorf("CanBot() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

internal/core/secret_resolve.go

@@ -52,6 +52,25 @@ func ForStorage(appId string, input SecretInput, kc keychain.KeychainAccess) (Se
 	return SecretInput{Ref: &SecretRef{Source: "keychain", ID: key}}, nil
 }
 
+// ValidateSecretKeyMatch checks that the appSecret keychain key references the
+// expected appId. This prevents silent mismatches when config.json is edited by
+// hand (e.g. appId changed but appSecret.id still points to the old app).
+// Only applicable when appSecret is a keychain SecretRef; other forms are skipped.
+func ValidateSecretKeyMatch(appId string, secret SecretInput) error {
+	if secret.Ref == nil || secret.Ref.Source != "keychain" {
+		return nil
+	}
+	expected := secretAccountKey(appId)
+	if secret.Ref.ID != expected {
+		return fmt.Errorf(
+			"appSecret keychain key %q does not match appId %q (expected %q); "+
+				"please run `lark-cli config init` to reconfigure",
+			secret.Ref.ID, appId, expected,
+		)
+	}
+	return nil
+}
+
 // RemoveSecretStore cleans up keychain entries when an app is removed.
 // Errors are intentionally ignored — cleanup is best-effort.
 func RemoveSecretStore(input SecretInput, kc keychain.KeychainAccess) {

internal/core/secret_resolve_test.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package core
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestValidateSecretKeyMatch_KeychainMatches(t *testing.T) {
+	secret := SecretInput{Ref: &SecretRef{Source: "keychain", ID: "appsecret:cli_abc123"}}
+	if err := ValidateSecretKeyMatch("cli_abc123", secret); err != nil {
+		t.Errorf("expected no error, got: %v", err)
+	}
+}
+
+func TestValidateSecretKeyMatch_KeychainMismatch(t *testing.T) {
+	secret := SecretInput{Ref: &SecretRef{Source: "keychain", ID: "appsecret:cli_old_app"}}
+	err := ValidateSecretKeyMatch("cli_new_app", secret)
+	if err == nil {
+		t.Fatal("expected error for mismatched appId and keychain key")
+	}
+	// Verify the error message contains useful context
+	msg := err.Error()
+	for _, want := range []string{"cli_old_app", "cli_new_app", "appsecret:cli_new_app", "config init"} {
+		if !strings.Contains(msg, want) {
+			t.Errorf("error message missing %q: %s", want, msg)
+		}
+	}
+}
+
+func TestValidateSecretKeyMatch_PlainSecret_Skipped(t *testing.T) {
+	secret := PlainSecret("some-secret")
+	if err := ValidateSecretKeyMatch("cli_abc123", secret); err != nil {
+		t.Errorf("plain secret should be skipped, got: %v", err)
+	}
+}
+
+func TestValidateSecretKeyMatch_FileRef_Skipped(t *testing.T) {
+	secret := SecretInput{Ref: &SecretRef{Source: "file", ID: "/tmp/secret.txt"}}
+	if err := ValidateSecretKeyMatch("cli_abc123", secret); err != nil {
+		t.Errorf("file ref should be skipped, got: %v", err)
+	}
+}
+
+func TestValidateSecretKeyMatch_ZeroValue_Skipped(t *testing.T) {
+	if err := ValidateSecretKeyMatch("cli_abc123", SecretInput{}); err != nil {
+		t.Errorf("zero SecretInput should be skipped, got: %v", err)
+	}
+}
+
+func TestValidateSecretKeyMatch_EmptyAppId_Mismatch(t *testing.T) {
+	secret := SecretInput{Ref: &SecretRef{Source: "keychain", ID: "appsecret:cli_abc123"}}
+	err := ValidateSecretKeyMatch("", secret)
+	if err == nil {
+		t.Fatal("expected error when appId is empty but keychain key references a real app")
+	}
+}

internal/credential/credential_provider_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential
 
 import (

internal/credential/default_provider_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential
 
 import (

internal/credential/integration_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential_test
 
 import (

internal/credential/types.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential
 
 import (

internal/credential/types_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package credential
 
 import (

internal/keychain/auth_log.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package keychain
 
 import (
@@ -9,6 +12,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/larksuite/cli/internal/validate"
 	"github.com/larksuite/cli/internal/vfs"
 )
 
@@ -21,6 +25,13 @@ var (
 )
 
 func authLogDir() string {
+	if dir := os.Getenv("LARKSUITE_CLI_LOG_DIR"); dir != "" {
+		safeDir, err := validate.SafeEnvDirPath(dir, "LARKSUITE_CLI_LOG_DIR")
+		if err == nil {
+			return safeDir
+		}
+	}
+
 	if dir := os.Getenv("LARKSUITE_CLI_CONFIG_DIR"); dir != "" {
 		return filepath.Join(dir, "logs")
 	}

internal/keychain/auth_log_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package keychain
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+// TestAuthLogDir_UsesValidatedLogDirEnv verifies that a valid absolute
+// LARKSUITE_CLI_LOG_DIR is normalized and used as the auth log directory.
+func TestAuthLogDir_UsesValidatedLogDirEnv(t *testing.T) {
+	base := t.TempDir()
+	base, _ = filepath.EvalSymlinks(base)
+	t.Setenv("LARKSUITE_CLI_LOG_DIR", filepath.Join(base, "logs", "..", "auth"))
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", "")
+
+	got := authLogDir()
+	want := filepath.Join(base, "auth")
+	if got != want {
+		t.Fatalf("authLogDir() = %q, want %q", got, want)
+	}
+}
+
+// TestAuthLogDir_InvalidLogDirFallsBackToConfigDir verifies that an invalid
+// LARKSUITE_CLI_LOG_DIR falls back to LARKSUITE_CLI_CONFIG_DIR/logs.
+func TestAuthLogDir_InvalidLogDirFallsBackToConfigDir(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_LOG_DIR", "relative-logs")
+	configDir := t.TempDir()
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", configDir)
+
+	got := authLogDir()
+	want := filepath.Join(configDir, "logs")
+	if got != want {
+		t.Fatalf("authLogDir() = %q, want %q", got, want)
+	}
+}

internal/keychain/keychain.go

@@ -36,10 +36,10 @@ func wrapError(op string, err error) error {
 	}
 
 	msg := fmt.Sprintf("keychain %s failed: %v", op, err)
-	hint := "Check if the OS keychain/credential manager is locked or accessible. If running inside a sandbox or CI environment, please ensure the process has the necessary permissions to access the keychain."
+	hint := "Check if the OS keychain/credential manager is locked or accessible. If running inside a sandbox or CI environment, please ensure the process has the necessary permissions to access the keychain, you can try running this outside the sandbox."
 
 	if errors.Is(err, errNotInitialized) {
-		hint = "The keychain master key may have been cleaned up or deleted. Please reconfigure the CLI by running `lark-cli config init`."
+		hint = "The keychain master key may have been cleaned up or deleted. If running inside a sandbox or CI environment, please ensure the process has the necessary permissions to access the keychain, you can try running this outside the sandbox. Otherwise, please reconfigure the CLI by running lark-cli config init."
 	}
 
 	func() {

internal/keychain/keychain_darwin_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 //go:build darwin
 
 package keychain

internal/keychain/keychain_other.go

@@ -16,6 +16,7 @@ import (
 	"regexp"
 
 	"github.com/google/uuid"
+	"github.com/larksuite/cli/internal/validate"
 	"github.com/larksuite/cli/internal/vfs"
 )
 
@@ -25,6 +26,12 @@ const tagBytes = 16
 
 // StorageDir returns the directory where encrypted files are stored.
 func StorageDir(service string) string {
+	if dir := os.Getenv("LARKSUITE_CLI_DATA_DIR"); dir != "" {
+		safeDir, err := validate.SafeEnvDirPath(dir, "LARKSUITE_CLI_DATA_DIR")
+		if err == nil {
+			return filepath.Join(safeDir, service)
+		}
+	}
 	home, err := vfs.UserHomeDir()
 	if err != nil || home == "" {
 		// If home is missing, fallback to relative path and print warning.

internal/keychain/keychain_other_test.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build linux
+
+package keychain
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+// TestStorageDir_UsesValidatedDataDirEnv verifies that a valid absolute
+// LARKSUITE_CLI_DATA_DIR is normalized and still preserves service isolation.
+func TestStorageDir_UsesValidatedDataDirEnv(t *testing.T) {
+	base := t.TempDir()
+	base, _ = filepath.EvalSymlinks(base)
+	t.Setenv("LARKSUITE_CLI_DATA_DIR", filepath.Join(base, "data", "..", "store"))
+
+	got := StorageDir("svc")
+	want := filepath.Join(base, "store", "svc")
+	if got != want {
+		t.Fatalf("StorageDir() = %q, want %q", got, want)
+	}
+}
+
+// TestStorageDir_InvalidDataDirFallsBackToDefault verifies that an invalid
+// LARKSUITE_CLI_DATA_DIR falls back to the default per-service storage path.
+func TestStorageDir_InvalidDataDirFallsBackToDefault(t *testing.T) {
+	home := t.TempDir()
+	home, _ = filepath.EvalSymlinks(home)
+	t.Setenv("LARKSUITE_CLI_DATA_DIR", "relative-data")
+	t.Setenv("HOME", home)
+
+	got := StorageDir("svc")
+	want := filepath.Join(home, ".local", "share", "svc")
+	if got != want {
+		t.Fatalf("StorageDir() = %q, want %q", got, want)
+	}
+}

internal/output/lark_errors.go

@@ -33,6 +33,11 @@ const (
 	LarkErrRefreshRevoked     = 20064 // refresh_token revoked
 	LarkErrRefreshAlreadyUsed = 20073 // refresh_token already consumed (single-use rotation)
 	LarkErrRefreshServerError = 20050 // refresh endpoint server-side error, retryable
+
+	// Drive shortcut / cross-space constraints.
+	LarkErrDriveResourceContention = 1061045 // resource contention occurred, please retry
+	LarkErrDriveCrossTenantUnit    = 1064510 // cross tenant and unit not support
+	LarkErrDriveCrossBrand         = 1064511 // cross brand not support
 )
 
 // ClassifyLarkError maps a Lark API error code + message to (exitCode, errType, hint).
@@ -60,6 +65,14 @@ func ClassifyLarkError(code int, msg string) (int, string, string) {
 	// rate limit
 	case LarkErrRateLimit:
 		return ExitAPI, "rate_limit", "please try again later"
+
+	// drive-specific constraints that benefit from actionable hints
+	case LarkErrDriveResourceContention:
+		return ExitAPI, "conflict", "please retry later and avoid concurrent duplicate requests"
+	case LarkErrDriveCrossTenantUnit:
+		return ExitAPI, "cross_tenant_unit", "operate on source and target within the same tenant and region/unit"
+	case LarkErrDriveCrossBrand:
+		return ExitAPI, "cross_brand", "operate on source and target within the same brand environment"
 	}
 
 	return ExitAPI, "api_error", ""

internal/output/lark_errors_test.go

@@ -0,0 +1,64 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package output
+
+import (
+	"strings"
+	"testing"
+)
+
+// TestClassifyLarkError_DriveCreateShortcutConstraints verifies known Drive shortcut errors map to actionable hints.
+func TestClassifyLarkError_DriveCreateShortcutConstraints(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name         string
+		code         int
+		wantExitCode int
+		wantType     string
+		wantHint     string
+	}{
+		{
+			name:         "resource contention",
+			code:         LarkErrDriveResourceContention,
+			wantExitCode: ExitAPI,
+			wantType:     "conflict",
+			wantHint:     "avoid concurrent duplicate requests",
+		},
+		{
+			name:         "cross tenant unit",
+			code:         LarkErrDriveCrossTenantUnit,
+			wantExitCode: ExitAPI,
+			wantType:     "cross_tenant_unit",
+			wantHint:     "same tenant and region/unit",
+		},
+		{
+			name:         "cross brand",
+			code:         LarkErrDriveCrossBrand,
+			wantExitCode: ExitAPI,
+			wantType:     "cross_brand",
+			wantHint:     "same brand environment",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			gotExitCode, gotType, gotHint := ClassifyLarkError(tt.code, "raw msg")
+			if gotExitCode != tt.wantExitCode {
+				t.Fatalf("exitCode=%d, want %d", gotExitCode, tt.wantExitCode)
+			}
+			if gotType != tt.wantType {
+				t.Fatalf("type=%q, want %q", gotType, tt.wantType)
+			}
+			if gotHint == "" {
+				t.Fatal("expected non-empty hint")
+			}
+			if !strings.Contains(gotHint, tt.wantHint) {
+				t.Fatalf("hint=%q, want substring %q", gotHint, tt.wantHint)
+			}
+		})
+	}
+}

internal/registry/registry_test.go

@@ -564,3 +564,54 @@ func TestCollectScopesForProjects_NonexistentProject(t *testing.T) {
 		t.Errorf("expected empty scopes for nonexistent project, got %d", len(scopes))
 	}
 }
+
+// --- auth_domain functions ---
+
+func TestGetAuthDomain_Configured(t *testing.T) {
+	// whiteboard has auth_domain: "docs" in service_descriptions.json
+	if got := GetAuthDomain("whiteboard"); got != "docs" {
+		t.Errorf("GetAuthDomain(whiteboard) = %q, want %q", got, "docs")
+	}
+}
+
+func TestGetAuthDomain_NotConfigured(t *testing.T) {
+	if got := GetAuthDomain("calendar"); got != "" {
+		t.Errorf("GetAuthDomain(calendar) = %q, want empty", got)
+	}
+}
+
+func TestGetAuthDomain_Unknown(t *testing.T) {
+	if got := GetAuthDomain("nonexistent_xyz"); got != "" {
+		t.Errorf("GetAuthDomain(nonexistent_xyz) = %q, want empty", got)
+	}
+}
+
+func TestHasAuthDomain(t *testing.T) {
+	if !HasAuthDomain("whiteboard") {
+		t.Error("HasAuthDomain(whiteboard) = false, want true")
+	}
+	if HasAuthDomain("calendar") {
+		t.Error("HasAuthDomain(calendar) = true, want false")
+	}
+}
+
+func TestGetAuthChildren(t *testing.T) {
+	children := GetAuthChildren("docs")
+	found := false
+	for _, c := range children {
+		if c == "whiteboard" {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Errorf("GetAuthChildren(docs) = %v, want to contain 'whiteboard'", children)
+	}
+}
+
+func TestGetAuthChildren_NoChildren(t *testing.T) {
+	children := GetAuthChildren("calendar")
+	if len(children) != 0 {
+		t.Errorf("GetAuthChildren(calendar) = %v, want empty", children)
+	}
+}

internal/registry/scope_overrides.json

@@ -4,8 +4,7 @@
     "im:message:send_as_bot": 1,
     "calendar:calendar:read": 70,
     "calendar:calendar:readonly": 1,
-    "sheets:spreadsheet:write_only": 45,
-    "docs:document.comment:delete": 60,
+    "sheets:spreadsheet:write_only": 60,
     "drive:drive:readonly": 1,
     "docs:doc:readonly": 1,
     "sheets:spreadsheet:readonly": 1,

internal/registry/service_desc.go

@@ -19,8 +19,9 @@ type serviceDescLocale struct {
 
 // serviceDescEntry holds bilingual descriptions for a service domain.
 type serviceDescEntry struct {
-	En serviceDescLocale `json:"en"`
-	Zh serviceDescLocale `json:"zh"`
+	En         serviceDescLocale `json:"en"`
+	Zh         serviceDescLocale `json:"zh"`
+	AuthDomain string            `json:"auth_domain,omitempty"`
 }
 
 var serviceDescMap map[string]serviceDescEntry
@@ -76,3 +77,31 @@ func GetServiceDetailDescription(name, lang string) string {
 	}
 	return loc.Description
 }
+
+// GetAuthDomain returns the auth_domain for a service, or "" if not set.
+// When auth_domain is set, the service's scopes are collected under the
+// parent domain during auth login.
+func GetAuthDomain(service string) string {
+	m := loadServiceDescriptions()
+	if entry, ok := m[service]; ok {
+		return entry.AuthDomain
+	}
+	return ""
+}
+
+// HasAuthDomain reports whether the service has an auth_domain configured.
+func HasAuthDomain(service string) bool {
+	return GetAuthDomain(service) != ""
+}
+
+// GetAuthChildren returns all service names whose auth_domain equals parent.
+func GetAuthChildren(parent string) []string {
+	m := loadServiceDescriptions()
+	var children []string
+	for name, entry := range m {
+		if entry.AuthDomain == parent {
+			children = append(children, name)
+		}
+	}
+	return children
+}

internal/registry/service_descriptions.json

@@ -43,6 +43,10 @@
     "en": { "title": "Sheets", "description": "Spreadsheet operations" },
     "zh": { "title": "电子表格", "description": "电子表格操作" }
   },
+  "slides": {
+    "en": { "title": "Slides", "description": "Create and manage presentations, read content, and add or remove slides" },
+    "zh": { "title": "幻灯片", "description": "创建和管理演示文稿、读取内容，以及新增或删除幻灯片页面" }
+  },
   "task": {
     "en": { "title": "Task", "description": "Task, task list, and subtask management" },
     "zh": { "title": "任务", "description": "任务、清单、子任务管理" }
@@ -53,7 +57,8 @@
   },
   "whiteboard": {
     "en": { "title": "Whiteboard", "description": "Create and edit boards" },
-    "zh": { "title": "画板", "description": "画板创建、编辑" }
+    "zh": { "title": "画板", "description": "画板创建、编辑" },
+    "auth_domain": "docs"
   },
   "wiki": {
     "en": { "title": "Wiki", "description": "Wiki space and node management" },

internal/selfupdate/updater.go

@@ -0,0 +1,240 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+// Package selfupdate handles installation detection, npm-based updates,
+// skills updates, and platform-specific binary replacement for the CLI
+// self-update flow.
+package selfupdate
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// InstallMethod describes how the CLI was installed.
+type InstallMethod int
+
+const (
+	InstallNpm InstallMethod = iota
+	InstallManual
+)
+
+const (
+	NpmPackage = "@larksuite/cli"
+)
+
+const (
+	npmInstallTimeout   = 10 * time.Minute
+	skillsUpdateTimeout = 2 * time.Minute
+	verifyTimeout       = 10 * time.Second
+)
+
+// DetectResult holds installation detection results.
+type DetectResult struct {
+	Method       InstallMethod
+	ResolvedPath string
+	NpmAvailable bool
+}
+
+// CanAutoUpdate returns true if the CLI can update itself automatically.
+func (d DetectResult) CanAutoUpdate() bool {
+	return d.Method == InstallNpm && d.NpmAvailable
+}
+
+// ManualReason returns a human-readable explanation of why auto-update is unavailable.
+func (d DetectResult) ManualReason() string {
+	if d.Method == InstallNpm && !d.NpmAvailable {
+		return "installed via npm, but npm is not available in PATH"
+	}
+	return "not installed via npm"
+}
+
+// NpmResult holds the result of an npm install or skills update execution.
+type NpmResult struct {
+	Stdout bytes.Buffer
+	Stderr bytes.Buffer
+	Err    error
+}
+
+// CombinedOutput returns stdout + stderr concatenated.
+func (r *NpmResult) CombinedOutput() string {
+	return r.Stdout.String() + r.Stderr.String()
+}
+
+// Updater manages self-update operations.
+// Platform-specific methods (PrepareSelfReplace, CleanupStaleFiles)
+// are in updater_unix.go and updater_windows.go.
+//
+// Override DetectOverride / NpmInstallOverride / SkillsUpdateOverride / VerifyOverride
+// / RestoreAvailableOverride for testing.
+type Updater struct {
+	DetectOverride           func() DetectResult
+	NpmInstallOverride       func(version string) *NpmResult
+	SkillsUpdateOverride     func() *NpmResult
+	VerifyOverride           func(expectedVersion string) error
+	RestoreAvailableOverride func() bool
+
+	// backupCreated is set to true by PrepareSelfReplace (Windows) when the
+	// running binary is successfully renamed to .old. Used by
+	// CanRestorePreviousVersion to report whether rollback is possible.
+	backupCreated bool
+}
+
+// New creates an Updater with default (real) behavior.
+func New() *Updater { return &Updater{} }
+
+// DetectInstallMethod determines how the CLI was installed and whether
+// npm is available for auto-update.
+func (u *Updater) DetectInstallMethod() DetectResult {
+	if u.DetectOverride != nil {
+		return u.DetectOverride()
+	}
+	exe, err := vfs.Executable()
+	if err != nil {
+		return DetectResult{Method: InstallManual}
+	}
+	resolved, err := vfs.EvalSymlinks(exe)
+	if err != nil {
+		return DetectResult{Method: InstallManual, ResolvedPath: exe}
+	}
+
+	method := InstallManual
+	if strings.Contains(resolved, "node_modules") {
+		method = InstallNpm
+	}
+
+	npmAvailable := false
+	if method == InstallNpm {
+		if _, err := exec.LookPath("npm"); err == nil {
+			npmAvailable = true
+		}
+	}
+
+	return DetectResult{
+		Method:       method,
+		ResolvedPath: resolved,
+		NpmAvailable: npmAvailable,
+	}
+}
+
+// RunNpmInstall executes npm install -g @larksuite/cli@<version>.
+func (u *Updater) RunNpmInstall(version string) *NpmResult {
+	if u.NpmInstallOverride != nil {
+		return u.NpmInstallOverride(version)
+	}
+	r := &NpmResult{}
+	npmPath, err := exec.LookPath("npm")
+	if err != nil {
+		r.Err = fmt.Errorf("npm not found in PATH: %w", err)
+		return r
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), npmInstallTimeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, npmPath, "install", "-g", NpmPackage+"@"+version)
+	cmd.Stdout = &r.Stdout
+	cmd.Stderr = &r.Stderr
+	r.Err = cmd.Run()
+	if ctx.Err() == context.DeadlineExceeded {
+		r.Err = fmt.Errorf("npm install timed out after %s", npmInstallTimeout)
+	}
+	return r
+}
+
+// RunSkillsUpdate installs skills, trying the .well-known source first and
+// falling back to the GitHub repo on failure or timeout.
+func (u *Updater) RunSkillsUpdate() *NpmResult {
+	if u.SkillsUpdateOverride != nil {
+		return u.SkillsUpdateOverride()
+	}
+	r := u.runSkillsAdd("https://open.feishu.cn")
+	if r.Err != nil {
+		r = u.runSkillsAdd("larksuite/cli")
+	}
+	return r
+}
+
+func (u *Updater) runSkillsAdd(source string) *NpmResult {
+	r := &NpmResult{}
+	npxPath, err := exec.LookPath("npx")
+	if err != nil {
+		r.Err = fmt.Errorf("npx not found in PATH: %w", err)
+		return r
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), skillsUpdateTimeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, npxPath, "-y", "skills", "add", source, "-g", "-y")
+	cmd.Stdout = &r.Stdout
+	cmd.Stderr = &r.Stderr
+	r.Err = cmd.Run()
+	if ctx.Err() == context.DeadlineExceeded {
+		r.Err = fmt.Errorf("skills update timed out after %s", skillsUpdateTimeout)
+	}
+	return r
+}
+
+// VerifyBinary checks that the installed binary reports the expected version
+// by running "lark-cli --version" and comparing the version token exactly.
+// Output format is "lark-cli version X.Y.Z"; the last field is extracted and
+// compared against expectedVersion (both stripped of any "v" prefix).
+func (u *Updater) VerifyBinary(expectedVersion string) error {
+	if u.VerifyOverride != nil {
+		return u.VerifyOverride(expectedVersion)
+	}
+	// Prefer the current executable path (what the user actually launched).
+	// Use Executable() directly without EvalSymlinks — after npm install the
+	// symlink target may have changed, but the path itself is still valid for
+	// execution. Fall back to LookPath only if Executable() fails entirely.
+	exe, err := vfs.Executable()
+	if err != nil {
+		exe, err = exec.LookPath("lark-cli")
+		if err != nil {
+			return fmt.Errorf("cannot locate binary: %w", err)
+		}
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), verifyTimeout)
+	defer cancel()
+	out, err := exec.CommandContext(ctx, exe, "--version").Output()
+	if ctx.Err() == context.DeadlineExceeded {
+		return fmt.Errorf("binary verification timed out after %s", verifyTimeout)
+	}
+	if err != nil {
+		return fmt.Errorf("binary not executable: %w", err)
+	}
+	fields := strings.Fields(strings.TrimSpace(string(out)))
+	if len(fields) == 0 {
+		return fmt.Errorf("empty version output")
+	}
+	actual := strings.TrimPrefix(fields[len(fields)-1], "v")
+	expected := strings.TrimPrefix(expectedVersion, "v")
+	if actual != expected {
+		return fmt.Errorf("expected version %s, got %q", expectedVersion, actual)
+	}
+	return nil
+}
+
+// Truncate returns the last maxLen runes of s.
+func Truncate(s string, maxLen int) string {
+	if maxLen <= 0 {
+		return ""
+	}
+	r := []rune(s)
+	if len(r) <= maxLen {
+		return s
+	}
+	return string(r[len(r)-maxLen:])
+}
+
+// resolveExe returns the resolved path of the current running binary.
+func (u *Updater) resolveExe() (string, error) {
+	exe, err := vfs.Executable()
+	if err != nil {
+		return "", err
+	}
+	return vfs.EvalSymlinks(exe)
+}

internal/selfupdate/updater_test.go

@@ -0,0 +1,89 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package selfupdate
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+type executableTestFS struct {
+	vfs.OsFs
+	exe string
+}
+
+func (f executableTestFS) Executable() (string, error) { return f.exe, nil }
+
+func TestResolveExe(t *testing.T) {
+	u := New()
+	p, err := u.resolveExe()
+	if err != nil {
+		t.Fatalf("resolveExe() error: %v", err)
+	}
+	if !filepath.IsAbs(p) {
+		t.Errorf("expected absolute path, got: %s", p)
+	}
+}
+
+func TestPrepareSelfReplace_ReturnsNoError(t *testing.T) {
+	u := New()
+	restore, err := u.PrepareSelfReplace()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	restore()
+}
+
+func TestCleanupStaleFiles_NoPanic(t *testing.T) {
+	u := New()
+	u.CleanupStaleFiles()
+}
+
+func TestVerifyBinaryChecksVersion(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("uses a POSIX shell script")
+	}
+
+	dir := t.TempDir()
+	exe := filepath.Join(dir, "lark-cli")
+	// Script prints version string matching real CLI format when --version is passed.
+	script := "#!/bin/sh\nif [ \"$1\" = \"--version\" ]; then echo \"lark-cli version 2.0.0\"; exit 0; fi\nexit 12\n"
+	if err := os.WriteFile(exe, []byte(script), 0755); err != nil {
+		t.Fatalf("write test binary: %v", err)
+	}
+
+	// Mock vfs.Executable to return our test script, matching VerifyBinary's
+	// primary lookup path. Also prepend to PATH for the LookPath fallback.
+	origFS := vfs.DefaultFS
+	vfs.DefaultFS = executableTestFS{OsFs: vfs.OsFs{}, exe: exe}
+	t.Cleanup(func() { vfs.DefaultFS = origFS })
+
+	origPath := os.Getenv("PATH")
+	t.Setenv("PATH", dir+string(os.PathListSeparator)+origPath)
+
+	// Matching version → success.
+	if err := New().VerifyBinary("2.0.0"); err != nil {
+		t.Fatalf("VerifyBinary(matching) error = %v, want nil", err)
+	}
+
+	// Mismatched version → error.
+	if err := New().VerifyBinary("3.0.0"); err == nil {
+		t.Fatal("VerifyBinary(mismatched) expected error, got nil")
+	}
+
+	// Substring of actual version must not match (e.g. "0.0" is in "2.0.0").
+	if err := New().VerifyBinary("0.0"); err == nil {
+		t.Fatal("VerifyBinary(substring) expected error, got nil")
+	}
+
+	// Version that is a prefix of actual must not match (e.g. "2.0.0" in "12.0.0").
+	// Binary reports "2.0.0", asking for "12.0.0" must fail.
+	if err := New().VerifyBinary("12.0.0"); err == nil {
+		t.Fatal("VerifyBinary(prefix-mismatch) expected error, got nil")
+	}
+}

internal/selfupdate/updater_unix.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build !windows
+
+package selfupdate
+
+// PrepareSelfReplace is a no-op on Unix.
+// Unix allows overwriting a running executable via inode semantics.
+func (u *Updater) PrepareSelfReplace() (restore func(), err error) {
+	return func() {}, nil
+}
+
+// CleanupStaleFiles is a no-op on Unix (no .old files are created).
+func (u *Updater) CleanupStaleFiles() {}
+
+// CanRestorePreviousVersion reports whether PrepareSelfReplace created a
+// restorable backup for the current update attempt.
+func (u *Updater) CanRestorePreviousVersion() bool {
+	if u.RestoreAvailableOverride != nil {
+		return u.RestoreAvailableOverride()
+	}
+	return u.backupCreated
+}

internal/selfupdate/updater_windows.go

@@ -0,0 +1,87 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build windows
+
+package selfupdate
+
+import (
+	"fmt"
+
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// PrepareSelfReplace renames the running .exe to .old so that npm's
+// postinstall script can write the new binary without hitting EBUSY.
+// Returns a restore function that undoes the rename on failure.
+func (u *Updater) PrepareSelfReplace() (restore func(), err error) {
+	noop := func() {}
+
+	exe, err := u.resolveExe()
+	if err != nil {
+		return noop, nil // best-effort; don't block update
+	}
+
+	oldPath := exe + ".old"
+
+	// Clean up stale .old from a previous upgrade.
+	vfs.Remove(oldPath)
+
+	// Rename running.exe → running.exe.old (Windows allows rename of locked files).
+	if err := vfs.Rename(exe, oldPath); err != nil {
+		return noop, fmt.Errorf("cannot rename binary for update: %w", err)
+	}
+	u.backupCreated = true
+
+	// Restore: move .old back to the original path.
+	// Guard with Stat: run.js may have already recovered .old on its own
+	// during VerifyBinary; if .old is gone, skip to avoid deleting the
+	// only working binary.
+	// On any failure, clear backupCreated so CanRestorePreviousVersion
+	// reports the real outcome instead of claiming success.
+	restore = func() {
+		if _, err := vfs.Stat(oldPath); err != nil {
+			u.backupCreated = false
+			return
+		}
+		vfs.Remove(exe)
+		if err := vfs.Rename(oldPath, exe); err != nil {
+			u.backupCreated = false
+		}
+	}
+
+	return restore, nil
+}
+
+// CleanupStaleFiles removes leftover .old files from previous upgrades.
+// If the original binary is missing but .old exists (crash mid-update),
+// it restores the .old to recover the installation.
+func (u *Updater) CleanupStaleFiles() {
+	exe, err := u.resolveExe()
+	if err != nil {
+		return
+	}
+	oldPath := exe + ".old"
+
+	if _, err := vfs.Stat(oldPath); err != nil {
+		return // no .old file
+	}
+
+	if _, err := vfs.Stat(exe); err != nil {
+		// Original missing, .old exists — restore to recover.
+		vfs.Rename(oldPath, exe)
+		return
+	}
+
+	// Both exist — .old is stale, clean up.
+	vfs.Remove(oldPath)
+}
+
+// CanRestorePreviousVersion reports whether PrepareSelfReplace created a
+// restorable backup for the current update attempt.
+func (u *Updater) CanRestorePreviousVersion() bool {
+	if u.RestoreAvailableOverride != nil {
+		return u.RestoreAvailableOverride()
+	}
+	return u.backupCreated
+}

internal/update/update.go

@@ -218,8 +218,8 @@ func fetchLatestVersion() (string, error) {
 // is considered newer — an unparseable local version is assumed outdated.
 // When a cannot be parsed, returns false (can't confirm it's newer).
 func IsNewer(a, b string) bool {
-	ap := ParseVersion(a)
-	bp := ParseVersion(b)
+	ap := parseVersionDetail(a)
+	bp := parseVersionDetail(b)
 	if ap == nil {
 		return false // can't confirm remote is newer
 	}
@@ -227,28 +227,59 @@ func IsNewer(a, b string) bool {
 		return true // local version unparseable → assume outdated
 	}
 	for i := 0; i < 3; i++ {
-		if ap[i] > bp[i] {
+		if ap.core[i] > bp.core[i] {
 			return true
 		}
-		if ap[i] < bp[i] {
+		if ap.core[i] < bp.core[i] {
 			return false
 		}
 	}
-	return false
+	return comparePrerelease(ap.prerelease, bp.prerelease) > 0
 }
 
 // ParseVersion parses "X.Y.Z" (with optional "v" prefix and pre-release suffix)
 // into [major, minor, patch]. Returns nil on invalid input.
 func ParseVersion(v string) []int {
+	parsed := parseVersionDetail(v)
+	if parsed == nil {
+		return nil
+	}
+	return []int{parsed.core[0], parsed.core[1], parsed.core[2]}
+}
+
+type parsedVersion struct {
+	core       [3]int
+	prerelease string
+}
+
+// validPrerelease matches semver pre-release identifiers (dot-separated).
+// Each identifier is either: "0", a non-zero-leading numeric, or alphanumeric with at least one letter/hyphen.
+// Rejects empty identifiers ("1.0.0-"), leading-zero numerics ("1.0.0-01"), etc.
+var validPrerelease = regexp.MustCompile(
+	`^(?:0|[1-9]\d*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)` +
+		`(?:\.(?:0|[1-9]\d*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*$`)
+
+func parseVersionDetail(v string) *parsedVersion {
 	v = strings.TrimPrefix(v, "v")
+	if idx := strings.Index(v, "+"); idx >= 0 {
+		v = v[:idx]
+	}
+	prerelease := ""
+	if idx := strings.Index(v, "-"); idx >= 0 {
+		prerelease = v[idx+1:]
+		v = v[:idx]
+		if prerelease == "" || !validPrerelease.MatchString(prerelease) {
+			return nil
+		}
+	}
 	parts := strings.SplitN(v, ".", 3)
 	if len(parts) != 3 {
 		return nil
 	}
-	nums := make([]int, 3)
+	var nums [3]int
 	for i, p := range parts {
-		if idx := strings.IndexAny(p, "-+"); idx >= 0 {
-			p = p[:idx]
+		if len(p) > 1 && p[0] == '0' {
+			return nil // leading zero in core part (e.g. "01.0.0")
 		}
 		n, err := strconv.Atoi(p)
 		if err != nil {
@@ -256,5 +287,56 @@ func ParseVersion(v string) []int {
 		}
 		nums[i] = n
 	}
-	return nums
+	return &parsedVersion{core: nums, prerelease: prerelease}
+}
+
+func comparePrerelease(a, b string) int {
+	if a == "" && b == "" {
+		return 0
+	}
+	if a == "" {
+		return 1
+	}
+	if b == "" {
+		return -1
+	}
+	ap := strings.Split(a, ".")
+	bp := strings.Split(b, ".")
+	for i := 0; i < len(ap) && i < len(bp); i++ {
+		cmp := comparePrereleaseIdentifier(ap[i], bp[i])
+		if cmp != 0 {
+			return cmp
+		}
+	}
+	switch {
+	case len(ap) > len(bp):
+		return 1
+	case len(ap) < len(bp):
+		return -1
+	default:
+		return 0
+	}
+}
+
+func comparePrereleaseIdentifier(a, b string) int {
+	an, aErr := strconv.Atoi(a)
+	bn, bErr := strconv.Atoi(b)
+	aNumeric := aErr == nil
+	bNumeric := bErr == nil
+	switch {
+	case aNumeric && bNumeric:
+		if an > bn {
+			return 1
+		}
+		if an < bn {
+			return -1
+		}
+		return 0
+	case aNumeric:
+		return -1
+	case bNumeric:
+		return 1
+	default:
+		return strings.Compare(a, b)
+	}
 }

internal/update/update_test.go

@@ -56,6 +56,9 @@ func TestIsNewer(t *testing.T) {
 		{"1.0.0", "9b933f1", true},                  // bare commit hash → assume outdated
 		{"", "1.0.0", false},                        // empty remote → false
 		{"1.1.0", "v1.0.0-12-g9b933f1-dirty", true}, // git describe: 1.1.0 > 1.0.0
+		{"1.0.0", "1.0.0-rc.1", true},               // stable release > prerelease
+		{"1.0.0-rc.2", "1.0.0-rc.1", true},          // prerelease identifiers are ordered
+		{"1.0.0-rc.1", "1.0.0", false},              // prerelease < stable release
 	}
 	for _, tt := range tests {
 		got := IsNewer(tt.a, tt.b)
@@ -74,6 +77,16 @@ func TestParseVersion(t *testing.T) {
 		{"v1.2.3", []int{1, 2, 3}},
 		{"0.0.1", []int{0, 0, 1}},
 		{"1.0.0-beta.1", []int{1, 0, 0}},
+		{"1.0.0-rc.1", []int{1, 0, 0}},
+		{"1.0.0-0", []int{1, 0, 0}},
+		{"1.0.0+build.123", []int{1, 0, 0}},
+		{"1.0.0-beta.1+build", []int{1, 0, 0}},
+		{"1.0.0-", nil},        // empty pre-release
+		{"1.0.0-01", nil},      // leading zero in numeric pre-release
+		{"1.0.0-beta..1", nil}, // empty identifier between dots
+		{"01.0.0", nil},        // leading zero in major
+		{"1.00.0", nil},        // leading zero in minor
+		{"1.0.00", nil},        // leading zero in patch
 		{"DEV", nil},
 		{"", nil},
 		{"1.2", nil},

internal/validate/atomicwrite.go

@@ -4,74 +4,20 @@
 package validate
 
 import (
-	"fmt"
 	"io"
 	"os"
-	"path/filepath"
 
-	"github.com/larksuite/cli/internal/vfs"
+	"github.com/larksuite/cli/internal/vfs/localfileio"
 )
 
-// AtomicWrite writes data to path atomically by creating a temp file in the
-// same directory, writing and fsyncing the data, then renaming over the target.
-// It replaces os.WriteFile for all config and download file writes.
-//
-// os.WriteFile truncates the target before writing, so a process kill (CI timeout,
-// OOM, Ctrl+C) between truncate and completion leaves the file empty or partial.
-// AtomicWrite avoids this: on any failure the temp file is cleaned up and the
-// original file remains untouched.
+// AtomicWrite writes data to path atomically.
+// Delegates to localfileio.AtomicWrite.
 func AtomicWrite(path string, data []byte, perm os.FileMode) error {
-	return atomicWrite(path, perm, func(tmp *os.File) error {
-		_, err := tmp.Write(data)
-		return err
-	})
+	return localfileio.AtomicWrite(path, data, perm)
 }
 
 // AtomicWriteFromReader atomically copies reader contents into path.
+// Delegates to localfileio.AtomicWriteFromReader.
 func AtomicWriteFromReader(path string, reader io.Reader, perm os.FileMode) (int64, error) {
-	var copied int64
-	err := atomicWrite(path, perm, func(tmp *os.File) error {
-		n, err := io.Copy(tmp, reader)
-		copied = n
-		return err
-	})
-	if err != nil {
-		return 0, err
-	}
-	return copied, nil
-}
-
-func atomicWrite(path string, perm os.FileMode, writeFn func(tmp *os.File) error) error {
-	dir := filepath.Dir(path)
-	tmp, err := vfs.CreateTemp(dir, "."+filepath.Base(path)+".*.tmp")
-	if err != nil {
-		return fmt.Errorf("create temp file: %w", err)
-	}
-	tmpName := tmp.Name()
-
-	success := false
-	defer func() {
-		if !success {
-			tmp.Close()
-			vfs.Remove(tmpName)
-		}
-	}()
-
-	if err := tmp.Chmod(perm); err != nil {
-		return err
-	}
-	if err := writeFn(tmp); err != nil {
-		return err
-	}
-	if err := tmp.Sync(); err != nil {
-		return err
-	}
-	if err := tmp.Close(); err != nil {
-		return err
-	}
-	if err := vfs.Rename(tmpName, path); err != nil {
-		return err
-	}
-	success = true
-	return nil
+	return localfileio.AtomicWriteFromReader(path, reader, perm)
 }

internal/validate/input.go

@@ -6,25 +6,17 @@ package validate
 import (
 	"fmt"
 	"strings"
+
+	"github.com/larksuite/cli/internal/charcheck"
 )
 
 // RejectControlChars rejects C0 control characters (except \t and \n) and
 // dangerous Unicode characters from user input.
 //
-// Control characters cause subtle security issues: null bytes truncate strings
-// at the C layer, \r\n enables HTTP header injection
-// Unicode characters allow visual spoofing (e.g. making "report.exe" display
-// as "report.txt").
+// Delegates to charcheck.RejectControlChars — the single source of truth
+// for character-level security checks.
 func RejectControlChars(value, flagName string) error {
-	for _, r := range value {
-		if r != '\t' && r != '\n' && (r < 0x20 || r == 0x7f) {
-			return fmt.Errorf("%s contains invalid control characters", flagName)
-		}
-		if isDangerousUnicode(r) {
-			return fmt.Errorf("%s contains dangerous Unicode characters", flagName)
-		}
-	}
-	return nil
+	return charcheck.RejectControlChars(value, flagName)
 }
 
 // RejectCRLF rejects strings containing carriage return (\r) or line feed (\n).
@@ -48,23 +40,3 @@ func StripQueryFragment(path string) string {
 	}
 	return path
 }
-
-// isDangerousUnicode identifies Unicode code points used for visual spoofing attacks.
-// These characters are invisible or alter text direction, allowing attackers to make
-// "report.exe" display as "report.txt" (Bidi override) or insert hidden content
-// (zero-width characters).
-func isDangerousUnicode(r rune) bool {
-	switch {
-	case r >= 0x200B && r <= 0x200D: // zero-width space/non-joiner/joiner
-		return true
-	case r == 0xFEFF: // BOM / ZWNBSP
-		return true
-	case r >= 0x202A && r <= 0x202E: // Bidi: LRE/RLE/PDF/LRO/RLO
-		return true
-	case r >= 0x2028 && r <= 0x2029: // line/paragraph separator
-		return true
-	case r >= 0x2066 && r <= 0x2069: // Bidi isolates: LRI/RLI/FSI/PDI
-		return true
-	}
-	return false
-}

internal/validate/path.go

@@ -3,127 +3,28 @@
 
 package validate
 
-import (
-	"fmt"
-	"path/filepath"
-	"strings"
+import "github.com/larksuite/cli/internal/vfs/localfileio"
 
-	"github.com/larksuite/cli/internal/vfs"
-)
-
-// SafeOutputPath validates a download/export target path for --output flags.
-// It rejects absolute paths, resolves symlinks to their real location, and
-// verifies the canonical result is still under the current working directory.
-// This prevents an AI Agent from being tricked into writing files outside the
-// working directory (e.g. "../../.ssh/authorized_keys") or following symlinks
-// to sensitive locations.
-//
-// The returned absolute path MUST be used for all subsequent I/O to prevent
-// time-of-check-to-time-of-use (TOCTOU) race conditions.
+// SafeOutputPath validates a download/export target path.
+// Delegates to localfileio.SafeOutputPath.
 func SafeOutputPath(path string) (string, error) {
-	return safePath(path, "--output")
+	return localfileio.SafeOutputPath(path)
 }
 
-// SafeInputPath validates an upload/read source path for --file flags.
-// It applies the same rules as SafeOutputPath — rejecting absolute paths,
-// resolving symlinks, and enforcing working directory containment — to prevent an AI Agent
-// from being tricked into reading sensitive files like /etc/passwd.
+// SafeInputPath validates an upload/read source path.
+// Delegates to localfileio.SafeInputPath.
 func SafeInputPath(path string) (string, error) {
-	return safePath(path, "--file")
+	return localfileio.SafeInputPath(path)
+}
+
+// SafeEnvDirPath validates an environment-provided application directory path.
+// Delegates to localfileio.SafeEnvDirPath.
+func SafeEnvDirPath(path, envName string) (string, error) {
+	return localfileio.SafeEnvDirPath(path, envName)
 }
 
 // SafeLocalFlagPath validates a flag value as a local file path.
-// Empty values and http/https URLs are returned unchanged without validation,
-// allowing the caller to handle non-path inputs (e.g. API keys, URLs) upstream.
-// For all other values, SafeInputPath rules apply.
-// The original relative path is returned unchanged (not resolved to absolute) so
-// upload helpers can re-validate at the actual I/O point via SafeUploadPath.
+// Delegates to localfileio.SafeLocalFlagPath.
 func SafeLocalFlagPath(flagName, value string) (string, error) {
-	if value == "" || strings.HasPrefix(value, "http://") || strings.HasPrefix(value, "https://") {
-		return value, nil
-	}
-	if _, err := SafeInputPath(value); err != nil {
-		return "", fmt.Errorf("%s: %v", flagName, err)
-	}
-	return value, nil
-}
-
-// safePath is the shared implementation for SafeOutputPath and SafeInputPath.
-func safePath(raw, flagName string) (string, error) {
-	if err := RejectControlChars(raw, flagName); err != nil {
-		return "", err
-	}
-
-	path := filepath.Clean(raw)
-
-	if filepath.IsAbs(path) {
-		return "", fmt.Errorf("%s must be a relative path within the current directory, got %q (hint: cd to the target directory first, or use a relative path like ./filename)", flagName, raw)
-	}
-
-	cwd, err := vfs.Getwd()
-	if err != nil {
-		return "", fmt.Errorf("cannot determine working directory: %w", err)
-	}
-	resolved := filepath.Join(cwd, path)
-
-	// Resolve symlinks: for existing paths, follow to real location;
-	// for non-existing paths, walk up to the nearest existing ancestor,
-	// resolve its symlinks, and re-attach the remaining tail segments.
-	// This prevents TOCTOU attacks where a non-existent intermediate
-	// directory is replaced with a symlink between check and use.
-	if _, err := vfs.Lstat(resolved); err == nil {
-		resolved, err = filepath.EvalSymlinks(resolved)
-		if err != nil {
-			return "", fmt.Errorf("cannot resolve symlinks: %w", err)
-		}
-	} else {
-		resolved, err = resolveNearestAncestor(resolved)
-		if err != nil {
-			return "", fmt.Errorf("cannot resolve symlinks: %w", err)
-		}
-	}
-
-	canonicalCwd, _ := filepath.EvalSymlinks(cwd)
-	if !isUnderDir(resolved, canonicalCwd) {
-		return "", fmt.Errorf("%s %q resolves outside the current working directory (hint: the path must stay within the working directory after resolving .. and symlinks)", flagName, raw)
-	}
-
-	return resolved, nil
-}
-
-// resolveNearestAncestor walks up from path until it finds an existing
-// ancestor, resolves that ancestor's symlinks, and re-joins the tail.
-// This ensures even deeply nested non-existent paths are anchored to a
-// real filesystem location, closing the TOCTOU symlink gap.
-func resolveNearestAncestor(path string) (string, error) {
-	var tail []string
-	cur := path
-	for {
-		if _, err := vfs.Lstat(cur); err == nil {
-			real, err := filepath.EvalSymlinks(cur)
-			if err != nil {
-				return "", err
-			}
-			parts := append([]string{real}, tail...)
-			return filepath.Join(parts...), nil
-		}
-		parent := filepath.Dir(cur)
-		if parent == cur {
-			// Reached filesystem root without finding an existing ancestor;
-			// return path as-is and let the containment check reject it.
-			parts := append([]string{cur}, tail...)
-			return filepath.Join(parts...), nil
-		}
-		tail = append([]string{filepath.Base(cur)}, tail...)
-		cur = parent
-	}
-}
-
-// isUnderDir checks whether child is under parent directory.
-func isUnderDir(child, parent string) bool {
-	rel, err := filepath.Rel(parent, child)
-	if err != nil {
-		return false
-	}
-	return !strings.HasPrefix(rel, ".."+string(filepath.Separator)) && rel != ".."
+	return localfileio.SafeLocalFlagPath(flagName, value)
 }

internal/validate/path_test.go

@@ -283,3 +283,30 @@ func TestSafeInputPath_ErrorMessageContainsCorrectFlagName(t *testing.T) {
 		t.Errorf("error should mention --output, got: %s", err.Error())
 	}
 }
+
+// TestSafeEnvDirPath_RequiresAbsolutePath verifies that environment-provided
+// directory paths must be absolute.
+func TestSafeEnvDirPath_RequiresAbsolutePath(t *testing.T) {
+	_, err := SafeEnvDirPath("logs", "LARKSUITE_CLI_LOG_DIR")
+	if err == nil {
+		t.Fatal("expected error for relative path")
+	}
+	if !strings.Contains(err.Error(), "LARKSUITE_CLI_LOG_DIR") {
+		t.Fatalf("error should mention env name, got %v", err)
+	}
+}
+
+// TestSafeEnvDirPath_ReturnsNormalizedAbsolutePath verifies that a valid
+// absolute environment directory is cleaned and resolved to its canonical path.
+func TestSafeEnvDirPath_ReturnsNormalizedAbsolutePath(t *testing.T) {
+	base := t.TempDir()
+	base, _ = filepath.EvalSymlinks(base)
+	got, err := SafeEnvDirPath(filepath.Join(base, "logs", "..", "auth"), "LARKSUITE_CLI_LOG_DIR")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	want := filepath.Join(base, "auth")
+	if got != want {
+		t.Fatalf("SafeEnvDirPath() = %q, want %q", got, want)
+	}
+}

internal/validate/resource.go

@@ -8,6 +8,8 @@ import (
 	"net/url"
 	"regexp"
 	"strings"
+
+	"github.com/larksuite/cli/internal/charcheck"
 )
 
 // unsafeResourceChars matches URL-special characters, control characters,
@@ -35,7 +37,7 @@ func ResourceName(name, flagName string) error {
 		return fmt.Errorf("%s contains invalid characters", flagName)
 	}
 	for _, r := range name {
-		if isDangerousUnicode(r) {
+		if charcheck.IsDangerousUnicode(r) {
 			return fmt.Errorf("%s contains dangerous Unicode characters", flagName)
 		}
 	}

internal/validate/sanitize.go

@@ -6,6 +6,8 @@ package validate
 import (
 	"regexp"
 	"strings"
+
+	"github.com/larksuite/cli/internal/charcheck"
 )
 
 // ansiEscape matches ANSI CSI sequences (ESC[ ... letter) and OSC sequences (ESC] ... BEL).
@@ -34,7 +36,7 @@ func SanitizeForTerminal(text string) string {
 			b.WriteRune(r)
 		case r < 0x20 || r == 0x7f:
 			continue
-		case isDangerousUnicode(r):
+		case charcheck.IsDangerousUnicode(r):
 			continue
 		default:
 			b.WriteRune(r)

internal/validate/sanitize_test.go

@@ -5,6 +5,8 @@ package validate
 
 import (
 	"testing"
+
+	"github.com/larksuite/cli/internal/charcheck"
 )
 
 func TestSanitizeForTerminal_StripsEscapesAndDangerousChars(t *testing.T) {
@@ -74,16 +76,16 @@ func TestIsDangerousUnicode_IdentifiesAllDangerousRanges(t *testing.T) {
 		0x2066, 0x2067, 0x2068, 0x2069, // isolates
 	}
 	for _, r := range dangerous {
-		if !isDangerousUnicode(r) {
-			t.Errorf("isDangerousUnicode(%U) = false, want true", r)
+		if !charcheck.IsDangerousUnicode(r) {
+			t.Errorf("charcheck.IsDangerousUnicode(%U) = false, want true", r)
 		}
 	}
 
 	// ── GIVEN: safe Unicode code points → THEN: returns false ──
 	safe := []rune{'A', '中', '!', ' ', '\t', '\n', 0x200A, 0x2070}
 	for _, r := range safe {
-		if isDangerousUnicode(r) {
-			t.Errorf("isDangerousUnicode(%U) = true, want false", r)
+		if charcheck.IsDangerousUnicode(r) {
+			t.Errorf("charcheck.IsDangerousUnicode(%U) = true, want false", r)
 		}
 	}
 }

internal/vfs/default.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package vfs
 
 import (
@@ -28,3 +31,5 @@ func MkdirAll(path string, perm fs.FileMode) error     { return DefaultFS.MkdirA
 func ReadDir(name string) ([]os.DirEntry, error)       { return DefaultFS.ReadDir(name) }
 func Remove(name string) error                         { return DefaultFS.Remove(name) }
 func Rename(oldpath, newpath string) error             { return DefaultFS.Rename(oldpath, newpath) }
+func EvalSymlinks(path string) (string, error)         { return DefaultFS.EvalSymlinks(path) }
+func Executable() (string, error)                      { return DefaultFS.Executable() }

internal/vfs/fs.go

@@ -1,3 +1,6 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
 package vfs
 
 import (
@@ -26,4 +29,8 @@ type FS interface {
 	ReadDir(name string) ([]os.DirEntry, error)
 	Remove(name string) error
 	Rename(oldpath, newpath string) error
+
+	// Path resolution
+	EvalSymlinks(path string) (string, error)
+	Executable() (string, error)
 }

internal/vfs/localfileio/atomicwrite.go

@@ -0,0 +1,74 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package localfileio
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// AtomicWrite writes data to path atomically via temp file + rename.
+func AtomicWrite(path string, data []byte, perm os.FileMode) error {
+	return atomicWrite(path, perm, func(tmp *os.File) error {
+		_, err := tmp.Write(data)
+		return err
+	})
+}
+
+// AtomicWriteFromReader atomically copies reader contents into path.
+func AtomicWriteFromReader(path string, reader io.Reader, perm os.FileMode) (int64, error) {
+	var copied int64
+	err := atomicWrite(path, perm, func(tmp *os.File) error {
+		n, err := io.Copy(tmp, reader)
+		copied = n
+		return err
+	})
+	if err != nil {
+		return 0, err
+	}
+	return copied, nil
+}
+
+func atomicWrite(path string, perm os.FileMode, writeFn func(tmp *os.File) error) error {
+	dir := filepath.Dir(path)
+	tmp, err := vfs.CreateTemp(dir, "."+filepath.Base(path)+".*.tmp")
+	if err != nil {
+		return fmt.Errorf("create temp file: %w", err)
+	}
+	tmpName := tmp.Name()
+
+	closed := false
+	success := false
+	defer func() {
+		if !success {
+			if !closed {
+				tmp.Close()
+			}
+			vfs.Remove(tmpName)
+		}
+	}()
+
+	if err := tmp.Chmod(perm); err != nil {
+		return err
+	}
+	if err := writeFn(tmp); err != nil {
+		return err
+	}
+	if err := tmp.Sync(); err != nil {
+		return err
+	}
+	if err := tmp.Close(); err != nil {
+		return err
+	}
+	closed = true
+	if err := vfs.Rename(tmpName, path); err != nil {
+		return err
+	}
+	success = true
+	return nil
+}

internal/vfs/localfileio/atomicwrite_test.go

@@ -0,0 +1,146 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package localfileio
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"testing"
+)
+
+func TestAtomicWrite_WritesContentAndPermissionCorrectly(t *testing.T) {
+	// GIVEN: a target path in a temp directory
+	dir := t.TempDir()
+	path := filepath.Join(dir, "test.json")
+	data := []byte(`{"key":"value"}`)
+
+	// WHEN: AtomicWrite writes data with 0644 permission
+	if err := AtomicWrite(path, data, 0644); err != nil {
+		t.Fatalf("AtomicWrite failed: %v", err)
+	}
+
+	// THEN: file content matches exactly
+	got, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("ReadFile failed: %v", err)
+	}
+	if string(got) != string(data) {
+		t.Errorf("content = %q, want %q", got, data)
+	}
+}
+
+func TestAtomicWrite_SetsRestrictivePermission(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("permission test not reliable on Windows")
+	}
+
+	// GIVEN: a target path
+	dir := t.TempDir()
+	path := filepath.Join(dir, "secret.json")
+
+	// WHEN: AtomicWrite writes with 0600 permission
+	if err := AtomicWrite(path, []byte("secret"), 0600); err != nil {
+		t.Fatalf("AtomicWrite failed: %v", err)
+	}
+
+	// THEN: file permission is exactly 0600 (owner read-write only)
+	info, _ := os.Stat(path)
+	if perm := info.Mode().Perm(); perm != 0600 {
+		t.Errorf("permission = %04o, want 0600", perm)
+	}
+}
+
+func TestAtomicWrite_OverwritesExistingFile(t *testing.T) {
+	// GIVEN: an existing file with old content
+	dir := t.TempDir()
+	path := filepath.Join(dir, "test.json")
+	AtomicWrite(path, []byte("old"), 0644)
+
+	// WHEN: AtomicWrite overwrites with new content
+	if err := AtomicWrite(path, []byte("new"), 0644); err != nil {
+		t.Fatalf("second write failed: %v", err)
+	}
+
+	// THEN: file contains new content
+	got, _ := os.ReadFile(path)
+	if string(got) != "new" {
+		t.Errorf("content = %q, want %q", got, "new")
+	}
+}
+
+func TestAtomicWrite_LeavesNoResidualTempFileOnError(t *testing.T) {
+	// GIVEN: a target path in a non-existent nested directory
+	path := filepath.Join(t.TempDir(), "nonexistent", "subdir", "file.txt")
+
+	// WHEN: AtomicWrite fails (parent directory doesn't exist)
+	err := AtomicWrite(path, []byte("data"), 0644)
+
+	// THEN: the write fails
+	if err == nil {
+		t.Fatal("expected error writing to nonexistent dir")
+	}
+
+	// THEN: no .tmp files are left behind
+	parentDir := filepath.Dir(filepath.Dir(path))
+	entries, _ := os.ReadDir(parentDir)
+	for _, e := range entries {
+		if filepath.Ext(e.Name()) == ".tmp" {
+			t.Errorf("residual temp file found: %s", e.Name())
+		}
+	}
+}
+
+func TestAtomicWrite_PreservesOriginalFileOnFailure(t *testing.T) {
+	// GIVEN: an existing file with known content
+	dir := t.TempDir()
+	original := []byte("original content")
+	path := filepath.Join(dir, "file.json")
+	if err := AtomicWrite(path, original, 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	// WHEN: AtomicWrite targets a non-existent directory (guaranteed to fail even as root)
+	badPath := filepath.Join(dir, "no", "such", "dir", "file.json")
+	err := AtomicWrite(badPath, []byte("new"), 0644)
+
+	// THEN: write fails
+	if err == nil {
+		t.Fatal("expected error writing to non-existent dir")
+	}
+
+	// THEN: the original file at the valid path is untouched
+	got, _ := os.ReadFile(path)
+	if string(got) != string(original) {
+		t.Errorf("original file corrupted: got %q, want %q", got, original)
+	}
+}
+
+func TestAtomicWrite_HandlesCorrectlyUnderConcurrentWrites(t *testing.T) {
+	// GIVEN: a target file that will be written by 20 concurrent goroutines
+	dir := t.TempDir()
+	path := filepath.Join(dir, "concurrent.json")
+
+	// WHEN: 20 goroutines write simultaneously
+	var wg sync.WaitGroup
+	for i := range 20 {
+		wg.Add(1)
+		go func(n int) {
+			defer wg.Done()
+			data := []byte(`{"n":` + string(rune('0'+n%10)) + `}`)
+			AtomicWrite(path, data, 0644)
+		}(i)
+	}
+	wg.Wait()
+
+	// THEN: file exists and is valid (not corrupted by interleaved writes)
+	got, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("ReadFile failed: %v", err)
+	}
+	if len(got) == 0 {
+		t.Error("file is empty after concurrent writes")
+	}
+}

internal/vfs/localfileio/localfileio.go

@@ -0,0 +1,81 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package localfileio
+
+import (
+	"context"
+	"io"
+	"path/filepath"
+
+	"github.com/larksuite/cli/extension/fileio"
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// Provider is the default fileio.Provider backed by the local filesystem.
+type Provider struct{}
+
+func (p *Provider) Name() string { return "local" }
+
+func (p *Provider) ResolveFileIO(_ context.Context) fileio.FileIO {
+	return &LocalFileIO{}
+}
+
+func init() {
+	fileio.Register(&Provider{})
+}
+
+// LocalFileIO implements fileio.FileIO using the local filesystem.
+// Path validation (SafeInputPath/SafeOutputPath), directory creation,
+// and atomic writes are handled internally.
+type LocalFileIO struct{}
+
+// Open opens a local file for reading after validating the path.
+func (l *LocalFileIO) Open(name string) (fileio.File, error) {
+	safePath, err := SafeInputPath(name)
+	if err != nil {
+		return nil, &fileio.PathValidationError{Err: err}
+	}
+	return vfs.Open(safePath)
+}
+
+// Stat returns file metadata after validating the path.
+func (l *LocalFileIO) Stat(name string) (fileio.FileInfo, error) {
+	safePath, err := SafeInputPath(name)
+	if err != nil {
+		return nil, &fileio.PathValidationError{Err: err}
+	}
+	return vfs.Stat(safePath)
+}
+
+// saveResult implements fileio.SaveResult.
+type saveResult struct{ size int64 }
+
+func (r *saveResult) Size() int64 { return r.size }
+
+// ResolvePath returns the validated absolute path for the given output path.
+func (l *LocalFileIO) ResolvePath(path string) (string, error) {
+	resolved, err := SafeOutputPath(path)
+	if err != nil {
+		return "", &fileio.PathValidationError{Err: err}
+	}
+	return resolved, nil
+}
+
+// Save writes body to path atomically after validating the output path.
+// Parent directories are created as needed. The body is streamed directly
+// to a temp file and renamed, avoiding full in-memory buffering.
+func (l *LocalFileIO) Save(path string, _ fileio.SaveOptions, body io.Reader) (fileio.SaveResult, error) {
+	safePath, err := SafeOutputPath(path)
+	if err != nil {
+		return nil, &fileio.PathValidationError{Err: err}
+	}
+	if err := vfs.MkdirAll(filepath.Dir(safePath), 0700); err != nil {
+		return nil, &fileio.MkdirError{Err: err}
+	}
+	n, err := AtomicWriteFromReader(safePath, body, 0600)
+	if err != nil {
+		return nil, &fileio.WriteError{Err: err}
+	}
+	return &saveResult{size: n}, nil
+}

internal/vfs/localfileio/localfileio_test.go

@@ -0,0 +1,306 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package localfileio
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/extension/fileio"
+)
+
+// testChdir temporarily changes the working directory for a test.
+// Not compatible with t.Parallel().
+func testChdir(t *testing.T, dir string) {
+	t.Helper()
+	orig, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { os.Chdir(orig) })
+}
+
+// ── Provider ──
+
+func TestProvider_Name(t *testing.T) {
+	p := &Provider{}
+	if got := p.Name(); got != "local" {
+		t.Errorf("Provider.Name() = %q, want %q", got, "local")
+	}
+}
+
+func TestProvider_ResolveFileIO(t *testing.T) {
+	p := &Provider{}
+	fio := p.ResolveFileIO(nil)
+	if fio == nil {
+		t.Fatal("Provider.ResolveFileIO returned nil")
+	}
+	if _, ok := fio.(*LocalFileIO); !ok {
+		t.Errorf("expected *LocalFileIO, got %T", fio)
+	}
+}
+
+// ── Open ──
+
+func TestLocalFileIO_Open_ValidFile(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	content := []byte("hello world")
+	os.WriteFile("test.txt", content, 0644)
+
+	fio := &LocalFileIO{}
+	f, err := fio.Open("test.txt")
+	if err != nil {
+		t.Fatalf("Open failed: %v", err)
+	}
+	defer f.Close()
+
+	got, err := io.ReadAll(f)
+	if err != nil {
+		t.Fatalf("ReadAll failed: %v", err)
+	}
+	if string(got) != string(content) {
+		t.Errorf("content = %q, want %q", got, content)
+	}
+}
+
+func TestLocalFileIO_Open_RejectsTraversal(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.Open("../../etc/passwd")
+	if err == nil {
+		t.Error("expected error for path traversal")
+	}
+}
+
+func TestLocalFileIO_Open_RejectsAbsolutePath(t *testing.T) {
+	fio := &LocalFileIO{}
+	_, err := fio.Open("/etc/passwd")
+	if err == nil {
+		t.Error("expected error for absolute path")
+	}
+	if err != nil && !strings.Contains(err.Error(), "relative path") {
+		t.Errorf("error should mention relative path, got: %v", err)
+	}
+}
+
+func TestLocalFileIO_Open_NonexistentFile(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.Open("nonexistent.txt")
+	if err == nil {
+		t.Error("expected error for nonexistent file")
+	}
+}
+
+// ── Stat ──
+
+func TestLocalFileIO_Stat_ValidFile(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	os.WriteFile("stat.txt", []byte("12345"), 0644)
+
+	fio := &LocalFileIO{}
+	info, err := fio.Stat("stat.txt")
+	if err != nil {
+		t.Fatalf("Stat failed: %v", err)
+	}
+	if info.Size() != 5 {
+		t.Errorf("Size() = %d, want 5", info.Size())
+	}
+	if info.IsDir() {
+		t.Error("expected IsDir() = false")
+	}
+}
+
+func TestLocalFileIO_Stat_RejectsTraversal(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.Stat("../../etc/passwd")
+	if err == nil {
+		t.Error("expected error for path traversal")
+	}
+	if err != nil && os.IsNotExist(err) {
+		t.Error("traversal should not be os.IsNotExist, should be a validation error")
+	}
+}
+
+func TestLocalFileIO_Stat_NonexistentReturnsIsNotExist(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.Stat("nope.txt")
+	if err == nil {
+		t.Error("expected error for nonexistent file")
+	}
+	if !os.IsNotExist(err) {
+		t.Errorf("expected os.IsNotExist, got: %v", err)
+	}
+}
+
+// ── Save ──
+
+func TestLocalFileIO_Save_WritesContent(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	body := strings.NewReader("saved content")
+	result, err := fio.Save("output.bin", fileio.SaveOptions{}, body)
+	if err != nil {
+		t.Fatalf("Save failed: %v", err)
+	}
+	if result.Size() != int64(len("saved content")) {
+		t.Errorf("Size() = %d, want %d", result.Size(), len("saved content"))
+	}
+
+	got, _ := os.ReadFile(filepath.Join(dir, "output.bin"))
+	if string(got) != "saved content" {
+		t.Errorf("file content = %q, want %q", got, "saved content")
+	}
+}
+
+func TestLocalFileIO_Save_CreatesParentDirs(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	body := strings.NewReader("nested")
+	_, err := fio.Save(filepath.Join("a", "b", "c.txt"), fileio.SaveOptions{}, body)
+	if err != nil {
+		t.Fatalf("Save with nested dir failed: %v", err)
+	}
+
+	got, _ := os.ReadFile(filepath.Join(dir, "a", "b", "c.txt"))
+	if string(got) != "nested" {
+		t.Errorf("file content = %q, want %q", got, "nested")
+	}
+}
+
+func TestLocalFileIO_Save_RejectsTraversal(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.Save("../../evil.txt", fileio.SaveOptions{}, strings.NewReader("bad"))
+	if err == nil {
+		t.Error("expected error for path traversal in Save")
+	}
+}
+
+func TestLocalFileIO_Save_RejectsAbsolutePath(t *testing.T) {
+	fio := &LocalFileIO{}
+	_, err := fio.Save("/tmp/evil.txt", fileio.SaveOptions{}, strings.NewReader("bad"))
+	if err == nil {
+		t.Error("expected error for absolute path in Save")
+	}
+}
+
+// ── ResolvePath ──
+
+func TestLocalFileIO_ResolvePath_ReturnsAbsolute(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	resolved, err := fio.ResolvePath("file.txt")
+	if err != nil {
+		t.Fatalf("ResolvePath failed: %v", err)
+	}
+	if !filepath.IsAbs(resolved) {
+		t.Errorf("expected absolute path, got %q", resolved)
+	}
+	if filepath.Base(resolved) != "file.txt" {
+		t.Errorf("expected base name file.txt, got %q", filepath.Base(resolved))
+	}
+}
+
+func TestLocalFileIO_ResolvePath_RejectsTraversal(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	_, err := fio.ResolvePath("../../etc/passwd")
+	if err == nil {
+		t.Error("expected error for path traversal in ResolvePath")
+	}
+}
+
+func TestLocalFileIO_ResolvePath_RejectsAbsolute(t *testing.T) {
+	fio := &LocalFileIO{}
+	_, err := fio.ResolvePath("/etc/passwd")
+	if err == nil {
+		t.Error("expected error for absolute path in ResolvePath")
+	}
+}
+
+// ── Error message consistency ──
+
+func TestLocalFileIO_ErrorMessages_ContainCorrectFlagName(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+
+	// Open/Stat use SafeInputPath → errors should mention "--file"
+	_, err := fio.Open("/absolute/path")
+	if err == nil || !strings.Contains(err.Error(), "--file") {
+		t.Errorf("Open absolute path error should mention --file, got: %v", err)
+	}
+
+	_, err = fio.Stat("/absolute/path")
+	if err == nil || !strings.Contains(err.Error(), "--file") {
+		t.Errorf("Stat absolute path error should mention --file, got: %v", err)
+	}
+
+	// Save/ResolvePath use SafeOutputPath → errors should mention "--output"
+	_, err = fio.Save("/absolute/path", fileio.SaveOptions{}, strings.NewReader(""))
+	if err == nil || !strings.Contains(err.Error(), "--output") {
+		t.Errorf("Save absolute path error should mention --output, got: %v", err)
+	}
+
+	_, err = fio.ResolvePath("/absolute/path")
+	if err == nil || !strings.Contains(err.Error(), "--output") {
+		t.Errorf("ResolvePath absolute path error should mention --output, got: %v", err)
+	}
+}
+
+// ── Control character / Unicode rejection ──
+
+func TestLocalFileIO_RejectsControlCharsInPath(t *testing.T) {
+	dir := t.TempDir()
+	testChdir(t, dir)
+
+	fio := &LocalFileIO{}
+	paths := []string{
+		"file\x00name.txt",   // null byte
+		"file\x1fname.txt",   // control char
+		"file\u200Bname.txt", // zero-width space
+		"file\u202Ename.txt", // bidi override
+	}
+
+	for _, p := range paths {
+		if _, err := fio.Open(p); err == nil {
+			t.Errorf("Open(%q) should reject control/dangerous chars", p)
+		}
+		if _, err := fio.Save(p, fileio.SaveOptions{}, strings.NewReader("")); err == nil {
+			t.Errorf("Save(%q) should reject control/dangerous chars", p)
+		}
+	}
+}

internal/vfs/localfileio/path.go

@@ -0,0 +1,131 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package localfileio
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/larksuite/cli/internal/charcheck"
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// SafeOutputPath validates a download/export target path for --output flags.
+func SafeOutputPath(path string) (string, error) {
+	return safePath(path, "--output")
+}
+
+// SafeInputPath validates an upload/read source path for --file flags.
+func SafeInputPath(path string) (string, error) {
+	return safePath(path, "--file")
+}
+
+// SafeLocalFlagPath validates a flag value as a local file path.
+// Empty values and http/https URLs are returned unchanged without validation.
+func SafeLocalFlagPath(flagName, value string) (string, error) {
+	if value == "" || strings.HasPrefix(value, "http://") || strings.HasPrefix(value, "https://") {
+		return value, nil
+	}
+	if _, err := SafeInputPath(value); err != nil {
+		return "", fmt.Errorf("%s: %v", flagName, err)
+	}
+	return value, nil
+}
+
+// SafeEnvDirPath validates an environment-provided application directory path.
+// It requires an absolute path, rejects control characters, normalizes the
+// input, and resolves symlinks through the nearest existing ancestor.
+func SafeEnvDirPath(path, envName string) (string, error) {
+	if err := charcheck.RejectControlChars(path, envName); err != nil {
+		return "", err
+	}
+
+	path = filepath.Clean(path)
+	if !filepath.IsAbs(path) {
+		return "", fmt.Errorf("%s must be an absolute path, got %q", envName, path)
+	}
+
+	resolved, err := resolveNearestAncestor(path)
+	if err != nil {
+		return "", fmt.Errorf("cannot resolve symlinks: %w", err)
+	}
+	return resolved, nil
+}
+
+// safePath is the shared implementation for SafeOutputPath and SafeInputPath.
+func safePath(raw, flagName string) (string, error) {
+	if err := charcheck.RejectControlChars(raw, flagName); err != nil {
+		return "", err
+	}
+
+	path := filepath.Clean(raw)
+
+	if filepath.IsAbs(path) {
+		return "", fmt.Errorf("%s must be a relative path within the current directory, got %q (hint: cd to the target directory first, or use a relative path like ./filename)", flagName, raw)
+	}
+
+	cwd, err := vfs.Getwd()
+	if err != nil {
+		return "", fmt.Errorf("cannot determine working directory: %w", err)
+	}
+	resolved := filepath.Join(cwd, path)
+
+	if _, err := vfs.Lstat(resolved); err == nil {
+		resolved, err = filepath.EvalSymlinks(resolved)
+		if err != nil {
+			return "", fmt.Errorf("cannot resolve symlinks: %w", err)
+		}
+	} else {
+		resolved, err = resolveNearestAncestor(resolved)
+		if err != nil {
+			return "", fmt.Errorf("cannot resolve symlinks: %w", err)
+		}
+	}
+
+	canonicalCwd, _ := filepath.EvalSymlinks(cwd)
+	if !isUnderDir(resolved, canonicalCwd) {
+		return "", fmt.Errorf("%s %q resolves outside the current working directory (hint: the path must stay within the working directory after resolving .. and symlinks)", flagName, raw)
+	}
+
+	return resolved, nil
+}
+
+func resolveNearestAncestor(path string) (string, error) {
+	var tail []string
+	cur := path
+	for {
+		if _, err := vfs.Lstat(cur); err == nil {
+			real, err := filepath.EvalSymlinks(cur)
+			if err != nil {
+				return "", err
+			}
+			parts := append([]string{real}, tail...)
+			return filepath.Join(parts...), nil
+		}
+		parent := filepath.Dir(cur)
+		if parent == cur {
+			parts := append([]string{cur}, tail...)
+			return filepath.Join(parts...), nil
+		}
+		tail = append([]string{filepath.Base(cur)}, tail...)
+		cur = parent
+	}
+}
+
+func isUnderDir(child, parent string) bool {
+	rel, err := filepath.Rel(parent, child)
+	if err != nil {
+		return false
+	}
+	return !strings.HasPrefix(rel, ".."+string(filepath.Separator)) && rel != ".."
+}
+
+// RejectControlChars delegates to charcheck.RejectControlChars.
+// Kept as a package-level alias for backward compatibility with callers
+// that import localfileio directly.
+var RejectControlChars = charcheck.RejectControlChars
+
+// IsDangerousUnicode delegates to charcheck.IsDangerousUnicode.
+var IsDangerousUnicode = charcheck.IsDangerousUnicode