Merge pull request #60 from sveltejs/changeset-release/main

docs: fix CLI command syntax for Claude Code and Gemini CLI

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+	"$schema": "https://unpkg.com/@changesets/config@3.1.1/schema.json",
+	"changelog": ["@svitejs/changesets-changelog-github-compact", { "repo": "sveltejs/mcp" }],
+	"commit": false,
+	"fixed": [],
+	"linked": [],
+	"access": "public",
+	"baseBranch": "main",
+	"updateInternalDependencies": "patch",
+	"ignore": []
+}

.cocoignore

@@ -0,0 +1,3 @@
+.claude
+.github
+.vscode

.cocominify

@@ -0,0 +1 @@
+packages/mcp-server/src/use_cases.json

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true

.gitattributes

@@ -0,0 +1,3 @@
+* text=auto eol=lf
+/packages/**/test/** -linguist-detectable
+/packages/**/fixtures/** -linguist-detectable

.github/ISSUE_TEMPLATE/autofixer_request.yml

@@ -0,0 +1,36 @@
+name: 'Autofixer Request'
+description: Request a new Autofixer for the MCP
+title: '[Autofixer Request] '
+labels: [enhancement, autofixer]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to request A new autofixer!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the problematic code
+      description: Please provide a clear and concise description the problem. Is much better if you can provide a code snippet the AI constantly get's wrong.
+      placeholder: The AI keeps messing with...
+    validations:
+      required: true
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Describe what the autofixer should suggest
+      description: If you were looking at this code, what would you suggest to the AI for it to fix it?
+      placeholder: You should never do this, instead do that...
+    validations:
+      required: true
+  - type: dropdown
+    id: importance
+    attributes:
+      label: Importance
+      description: How important is this feature to you?
+      options:
+        - nice to have
+        - would make my life easier
+        - the MCP is useless to me without it
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,52 @@
+name: "\U0001F41E Bug report"
+description: Report an issue with Svelte
+title: '[Bug] '
+labels: ['triage: bug']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is. If you intend to submit a PR for this issue, tell us in the description. Thanks!
+      placeholder: Bug description
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Please provide a link to a repo or REPL that can reproduce the problem you ran into. If a report is vague (e.g. just a generic error message) and has no reproduction, it will receive a "need reproduction" label. If no reproduction is provided within a reasonable time-frame, the issue will be closed.
+      placeholder: Reproduction
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: 'Please provide some logs or screenshot of the agentic workflow failing.'
+      render: shell
+  - type: input
+    id: mcp-client
+    attributes:
+      label: MCP Client
+      description: Which MCP client are you using?
+      render: shell
+      placeholder: claude-code, codex, opencode
+    validations:
+      required: true
+  - type: dropdown
+    id: severity
+    attributes:
+      label: Severity
+      description: Select the severity of this issue
+      options:
+        - annoyance
+        - minor functionality loss
+        - major functionality loss
+        - blocking all usage of the mcp
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,36 @@
+name: 'Feature Request'
+description: Request a new MCP feature
+title: '[Feature Request] '
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to request this feature! If your feature request is complex or substantial enough to warrant in-depth discussion, maintainers may close the issue and ask you to open an [RFC](https://github.com/sveltejs/rfcs).
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the problem
+      description: Please provide a clear and concise description the problem this feature would solve. The more information you can provide here, the better.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the proposed solution
+      description: Please provide a clear and concise description of what you would like to happen.
+      placeholder: I would like to see...
+    validations:
+      required: true
+  - type: dropdown
+    id: importance
+    attributes:
+      label: Importance
+      description: How important is this feature to you?
+      options:
+        - nice to have
+        - would make my life easier
+        - the MCP is useless to me without it
+    validations:
+      required: true

.github/workflows/check.yml

@@ -13,15 +13,15 @@ jobs:
 
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
         with:
-          version: 10
+          version: 10.18.1
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: '22'
           cache: 'pnpm'
@@ -33,4 +33,5 @@ jobs:
         run: pnpm run check
         env:
           DATABASE_URL: file:test.db
+          DATABASE_TOKEN: dummy-key
           VOYAGE_API_KEY: dummy-key

.github/workflows/lint.yml

@@ -13,15 +13,15 @@ jobs:
 
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
         with:
-          version: 10
+          version: 10.18.1
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: '22'
           cache: 'pnpm'
@@ -34,3 +34,4 @@ jobs:
         env:
           DATABASE_URL: file:test.db
           VOYAGE_API_KEY: dummy-key
+          DATABASE_TOKEN: dummy-key

.github/workflows/publish-mcp.yml

@@ -0,0 +1,37 @@
+name: Publish to MCP Registry
+
+on:
+  workflow_call:
+
+jobs:
+  publish-mcp:
+    name: Publish to MCP Registry
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v5
+
+      - name: Publish to MCP Registry
+        working-directory: packages/mcp-stdio
+        env:
+          MCP_KEY: ${{ secrets.MCP_KEY }}
+        run: |
+          NAME=mcp-publisher_1.2.3_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz
+          # Download MCP Publisher pinned to v1.2.3 using latest https for security and save it to a file named mcp-publisher.tar.gz
+          curl --proto '=https' --proto-redir '=https' --tlsv1.2 -fL "https://github.com/modelcontextprotocol/registry/releases/download/v1.2.3/$NAME" -O
+
+          # Verify the SHA256 checksum of the downloaded file
+          sha256sum --ignore-missing -c ./checksums/registry_1.2.3_checksums.txt
+
+          # Extract the tarball
+          mkdir tmp
+          tar -xzf $NAME --no-same-owner --no-same-permissions -C tmp
+
+          # Install the MCP Publisher binary
+          install -m 0755  tmp/mcp-publisher .
+
+          # Login using DNS
+          ./mcp-publisher login dns --domain svelte.dev --private-key "${MCP_KEY}"
+
+          # Publish to MCP Registry
+          ./mcp-publisher publish

.github/workflows/release.yml

@@ -0,0 +1,67 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+permissions: {}
+
+jobs:
+  release:
+    permissions:
+      contents: write # to create release (changesets/action)
+      id-token: write # OpenID Connect token needed for provenance
+      pull-requests: write # to create pull request (changesets/action)
+    # prevents this action from running on forks
+    if: github.repository == 'sveltejs/mcp'
+    name: Release
+    runs-on: ${{ matrix.os }}
+    outputs:
+      published: ${{ steps.changesets.outputs.published }}
+    strategy:
+      matrix:
+        # pseudo-matrix for convenience, NEVER use more than a single combination
+        node: [24]
+        os: [ubuntu-latest]
+    steps:
+      - name: checkout
+        uses: actions/checkout@v5
+        with:
+          # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
+          fetch-depth: 0
+      - uses: actions/setup-node@v5
+        with:
+          node-version: ${{ matrix.node }}
+          package-manager-cache: false # pnpm is not installed yet
+      - name: install pnpm
+        shell: bash
+        run: |
+          PNPM_VER=$(jq -r '.packageManager | if .[0:5] == "pnpm@" then .[5:] else "packageManager in package.json does not start with pnpm@\n" | halt_error(1)  end' package.json)
+          echo installing pnpm version $PNPM_VER
+          npm i -g pnpm@$PNPM_VER
+      - uses: actions/setup-node@v5
+        with:
+          node-version: ${{ matrix.node }}
+          package-manager-cache: true # caches pnpm via packageManager field in package.json
+      - name: install
+        run: pnpm install --frozen-lockfile --prefer-offline --ignore-scripts
+      - name: build
+        run: pnpm run --filter ./packages/mcp-stdio/ build
+
+      - name: Create Release Pull Request or Publish to npm
+        id: changesets
+        # pinned for security, always review third party action code before updating
+        uses: changesets/action@e0145edc7d9d8679003495b11f87bd8ef63c0cba # v1.5.3
+        with:
+          # This expects you to have a script called changeset:version version that calls changeset version and updated what it needs to be updated
+          version: pnpm changeset:version
+          # This expects you to have a script called release which does a build for your packages and calls changeset publish
+          publish: pnpm release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_CONFIG_PROVENANCE: true
+
+  publish-mcp:
+    needs: release
+    if: needs.release.outputs.published == 'true'
+    uses: ./.github/workflows/publish-mcp.yml

.github/workflows/test.yml

@@ -13,15 +13,15 @@ jobs:
 
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
         with:
-          version: 10
+          version: 10.18.1
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: '22'
           cache: 'pnpm'
@@ -34,9 +34,11 @@ jobs:
         env:
           DATABASE_URL: file:test.db
           VOYAGE_API_KEY: dummy-key
+          DATABASE_TOKEN: dummy-key
 
       - name: Run tests
         run: pnpm run test
         env:
           DATABASE_URL: file:test.db
           VOYAGE_API_KEY: dummy-key
+          DATABASE_TOKEN: dummy-key

.gitignore

@@ -1,12 +1,16 @@
 node_modules
+/apps/**/node_modules
+/packages/**/node_modules
 
 # Output
-.output
-.vercel
-.netlify
-.wrangler
-/.svelte-kit
-/build
+/apps/**/.output
+/apps/**/.vercel
+/apps/**/.netlify
+/apps/**/.wrangler
+/**/.svelte-kit
+/apps/**/build
+/apps/**/dist
+/packages/**/dist
 
 # OS
 .DS_Store
@@ -14,14 +18,25 @@ Thumbs.db
 
 # Env
 .env
+/apps/**/.env
+/packages/**/.env
 .env.*
+/apps/**/.env.*
+/packages/**/.env.*
 !.env.example
+/apps/**/!.env.example
+/packages/**/!.env.example
 !.env.test
+/apps/**/!.env.test
+/packages/**/!.env.test
 
 # Vite
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
+/apps/**/vite.config.js.timestamp-*
+/apps/**/vite.config.ts.timestamp-*
 
 # SQLite
 *.db
-dist
+/apps/**/*.db
+/packages/**/*.db

.mcp.json

@@ -1,8 +1,9 @@
 {
 	"mcpServers": {
-		"svelte-llm": {
-			"type": "http",
-			"url": "https://svelte-llm.stanislav.garden/mcp/mcp"
+		"svelte": {
+			"type": "stdio",
+			"command": "node",
+			"args": ["packages/mcp-stdio/dist/index.js"]
 		}
 	}
 }

.prettierignore

@@ -8,3 +8,7 @@ bun.lockb
 # Miscellaneous
 /static/
 /drizzle/
+/**/.svelte-kit/*
+
+# Claude Code
+.claude/

.vscode/mcp-snippets.code-snippets

@@ -0,0 +1,33 @@
+{
+	// Place your svelte-mcp workspace snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and
+	// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope
+	// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is
+	// used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
+	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders.
+	// Placeholders with the same ids are connected.
+	// Example:
+	"Setup Function": {
+		"scope": "javascript,typescript",
+		"prefix": "!setup-mcp",
+		"body": [
+			"import type { SvelteMcp } from '../../index.js';",
+			"import * as v from 'valibot';",
+			"",
+			"export function ${1:function_name}(server: SvelteMcp) {",
+			"\t$0",
+			"}",
+		],
+		"description": "Create a setup function for a tool/resource/prompt handler",
+	},
+	"Autofixer": {
+		"scope": "javascript,typescript",
+		"prefix": "!autofixer",
+		"body": [
+			"import type { Autofixer } from '.';",
+			"export const ${1:autofixer_name}: Autofixer = {",
+			"\t$0",
+			"};",
+		],
+		"description": "Create a setup export for an autofixer",
+	},
+}

.vscode/mcp.json

@@ -3,7 +3,7 @@
 		"Svelte MCP": {
 			"type": "stdio",
 			"command": "node",
-			"args": ["dist/lib/stdio.js"]
+			"args": ["packages/mcp-stdio/dist/index.js"]
 		}
 	},
 	"inputs": []

CLAUDE.md

@@ -90,12 +90,12 @@ When connected to the svelte-llm MCP server, you have access to comprehensive Sv
 
 ## Available MCP Tools:
 
-### 1. list_sections
+### 1. list-sections
 
 Use this FIRST to discover all available documentation sections. Returns a structured list with titles and paths.
 When asked about Svelte or SvelteKit topics, ALWAYS use this tool at the start of the chat to find relevant sections.
 
-### 2. get_documentation
+### 2. get-documentation
 
 Retrieves full documentation content for specific sections. Accepts single or multiple sections.
-After calling the list_sections tool, you MUST analyze the returned documentation sections and then use the get_documentation tool to fetch ALL documentation sections that are relevant for the users task.
+After calling the list-sections tool, you MUST analyze the returned documentation sections and then use the get_documentation tool to fetch ALL documentation sections that are relevant for the users task.

README.md

@@ -6,12 +6,15 @@ Repo for the official Svelte MCP server.
 
 ```
 pnpm i
-cp .env.example .env
+cp apps/mcp-remote/.env.example apps/mcp-remote/.env
 pnpm dev
 ```
 
 1. Set the VOYAGE_API_KEY for embeddings support
 
+> [!NOTE]
+> Currently to prevent having a bunch of Timeout logs on vercel we shut down the SSE channel immediately. This means that we can't use `server.log` and we are not sending `list-changed` notifications. We can use elicitation and sampling since those are sent on the same stream of the POST request
+
 ### Local dev tools
 
 #### MCP inspector

apps/mcp-remote/package.json

@@ -0,0 +1,70 @@
+{
+	"name": "@sveltejs/mcp-remote",
+	"version": "0.0.1",
+	"description": "The official Svelte MCP server implementation",
+	"type": "module",
+	"main": "src/index.js",
+	"bin": {
+		"svelte-mcp": "./dist/lib/stdio.js"
+	},
+	"scripts": {
+		"start": "node src/index.js",
+		"dev": "vite dev",
+		"build": "vite build",
+		"build:mcp": "tsc --project tsconfig.build.json",
+		"prepublishOnly": "pnpm build:mcp",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"format": "prettier --write .",
+		"lint": "prettier --check . && eslint .",
+		"lint:fix": "prettier --write . && eslint . --fix",
+		"test:unit": "vitest",
+		"test": "npm run test:unit -- --run",
+		"test:watch": "npm run test:unit -- --watch",
+		"db:push": "drizzle-kit push",
+		"db:generate": "drizzle-kit generate",
+		"db:migrate": "drizzle-kit migrate",
+		"db:studio": "drizzle-kit studio",
+		"inspect": "pnpm mcp-inspector"
+	},
+	"keywords": [
+		"svelte",
+		"tmcp",
+		"mcp",
+		"server"
+	],
+	"private": true,
+	"devDependencies": {
+		"@eslint/compat": "^1.3.2",
+		"@eslint/js": "^9.36.0",
+		"@libsql/client": "^0.15.0",
+		"@modelcontextprotocol/inspector": "^0.17.0",
+		"@sveltejs/adapter-vercel": "^5.6.3",
+		"@sveltejs/kit": "^2.22.0",
+		"@sveltejs/vite-plugin-svelte": "^6.0.0",
+		"@types/node": "^24.3.1",
+		"@typescript-eslint/parser": "^8.44.0",
+		"drizzle-kit": "^0.31.0",
+		"drizzle-orm": "^0.44.0",
+		"eslint-config-prettier": "^10.0.1",
+		"eslint-plugin-svelte": "^3.12.3",
+		"globals": "^16.0.0",
+		"prettier": "^3.4.2",
+		"prettier-plugin-svelte": "^3.3.3",
+		"svelte": "^5.0.0",
+		"svelte-check": "^4.0.0",
+		"svelte-eslint-parser": "^1.3.2",
+		"typescript": "^5.0.0",
+		"vite": "^7.0.4",
+		"vite-plugin-devtools-json": "^1.0.0",
+		"vitest": "^3.2.3"
+	},
+	"dependencies": {
+		"@sveltejs/mcp-schema": "workspace:^",
+		"@sveltejs/mcp-server": "workspace:^",
+		"@tmcp/transport-http": "^0.6.3",
+		"tmcp": "^1.14.0"
+	}
+}

apps/mcp-remote/src/hooks.server.ts

@@ -0,0 +1,35 @@
+import { http_transport } from '$lib/mcp/index.js';
+import { db } from '$lib/server/db/index.js';
+import { redirect } from '@sveltejs/kit';
+
+export async function handle({ event, resolve }) {
+	if (event.request.method === 'GET') {
+		const accept = event.request.headers.get('accept');
+		if (accept) {
+			const accepts = accept.split(',');
+			if (!accepts.includes('text/event-stream')) {
+				// the request it's a browser request, not an MCP client request
+				// it means someone probably opened it from the docs...we should redirect to the docs
+				redirect(302, 'https://svelte.dev/docs/mcp/overview');
+			}
+		}
+	}
+	const mcp_response = await http_transport.respond(event.request, {
+		db,
+	});
+	// we are deploying on vercel the SSE connection will timeout after 5 minutes...for
+	// the moment we are not sending back any notifications (logs, or list changed notifications)
+	// so it's a waste of resources to keep a connection open that will error
+	// after 5 minutes making the logs dirty. For this reason if we have a response from
+	// the MCP server and it's a GET request we just return an empty response (it has to be
+	// 200 or the MCP client will complain)
+	if (mcp_response && event.request.method === 'GET') {
+		try {
+			await mcp_response.body?.cancel();
+		} catch {
+			// ignore
+		}
+		return new Response('', { status: 200 });
+	}
+	return mcp_response ?? resolve(event);
+}

apps/mcp-remote/src/lib/mcp/index.ts

@@ -0,0 +1,6 @@
+import { server } from '@sveltejs/mcp-server';
+import { HttpTransport } from '@tmcp/transport-http';
+
+export const http_transport = new HttpTransport(server, {
+	cors: true,
+});

apps/mcp-remote/src/lib/server/db/index.ts

@@ -0,0 +1,15 @@
+import { createClient } from '@libsql/client';
+import { drizzle } from 'drizzle-orm/libsql';
+import * as schema from './schema.js';
+// let's disable it for the moment...i can't figure out a way to make it wotk with eslint
+// eslint-disable-next-line import/extensions
+import { DATABASE_TOKEN, DATABASE_URL } from '$env/static/private';
+if (!DATABASE_URL) throw new Error('DATABASE_URL is not set');
+if (!DATABASE_TOKEN) throw new Error('DATABASE_TOKEN is not set');
+
+const client = createClient({
+	url: DATABASE_URL,
+	authToken: DATABASE_TOKEN,
+});
+
+export const db = drizzle(client, { schema, logger: true });

apps/mcp-remote/src/lib/server/db/schema.ts

@@ -0,0 +1,2 @@
+// we need to re-export from here to allow for the drizzle config to pick them up for migrations
+export * from '@sveltejs/mcp-schema/schema';

apps/mcp-remote/tsconfig.json

@@ -0,0 +1,19 @@
+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
+	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
+	//
+	// To make changes to top-level options such as include and exclude, we recommend extending
+	// the generated config; see https://svelte.dev/docs/kit/configuration#typescript
+}

apps/mcp-remote/vite.config.ts

@@ -0,0 +1,22 @@
+import devtoolsJson from 'vite-plugin-devtools-json';
+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [sveltekit(), devtoolsJson()],
+	// we don't have tests yet so we just comment this out for now
+	// test: {
+	// 	expect: { requireAssertions: true },
+	// 	projects: [
+	// 		{
+	// 			extends: './vite.config.ts',
+	// 			test: {
+	// 				name: 'server',
+	// 				environment: 'node',
+	// 				include: ['src/**/*.{test,spec}.{js,ts}'],
+	// 				exclude: ['src/**/*.svelte.{test,spec}.{js,ts}'],
+	// 			},
+	// 		},
+	// 	],
+	// },
+});

docs/tmcp.md

@@ -0,0 +1,320 @@
+> [!WARNING]
+> Unfortunately i published the 1.0 by mistake...this package is currently under heavy development so there will be breaking changes in minors...threat this `1.x` as the `0.x` of any other package. Sorry for the disservice, every breaking will be properly labeled in the PR name.
+
+# tmcp
+
+A lightweight, schema-agnostic Model Context Protocol (MCP) server implementation with unified API design.
+
+## Why tmcp?
+
+tmcp offers significant advantages over the official MCP SDK:
+
+- **🔄 Schema Agnostic**: Works with any validation library through adapters
+- **📦 No Weird Dependencies**: Minimal footprint with only essential dependencies (looking at you `express`)
+- **🎯 Unified API**: Consistent, intuitive interface across all MCP capabilities
+- **🔌 Extensible**: Easy to add support for new schema libraries
+- **⚡ Lightweight**: No bloat, just what you need
+
+## Supported Schema Libraries
+
+tmcp works with all major schema validation libraries through its adapter system:
+
+- **Zod** - `@tmcp/adapter-zod`
+- **Valibot** - `@tmcp/adapter-valibot`
+- **ArkType** - `@tmcp/adapter-arktype`
+- **Effect Schema** - `@tmcp/adapter-effect`
+- **Zod v3** - `@tmcp/adapter-zod-v3`
+
+## Installation
+
+```bash
+pnpm install tmcp
+# Choose your preferred schema library adapter
+pnpm install @tmcp/adapter-zod zod
+# Choose your preferred transport
+pnpm install @tmcp/transport-stdio  # For CLI/desktop apps
+pnpm install @tmcp/transport-http   # For web-based clients
+```
+
+## Quick Start
+
+### Standard I/O Transport (CLI/Desktop)
+
+```javascript
+import { McpServer } from 'tmcp';
+import { ZodJsonSchemaAdapter } from '@tmcp/adapter-zod';
+import { StdioTransport } from '@tmcp/transport-stdio';
+import { z } from 'zod';
+
+const adapter = new ZodJsonSchemaAdapter();
+const server = new McpServer(
+	{
+		name: 'my-server',
+		version: '1.0.0',
+		description: 'My awesome MCP server',
+	},
+	{
+		adapter,
+		capabilities: {
+			tools: { listChanged: true },
+			prompts: { listChanged: true },
+			resources: { listChanged: true },
+		},
+	},
+);
+
+// Define a tool with type-safe schema
+server.tool(
+	{
+		name: 'calculate',
+		description: 'Perform mathematical calculations',
+		schema: z.object({
+			operation: z.enum(['add', 'subtract', 'multiply', 'divide']),
+			a: z.number(),
+			b: z.number(),
+		}),
+	},
+	async ({ operation, a, b }) => {
+		switch (operation) {
+			case 'add':
+				return a + b;
+			case 'subtract':
+				return a - b;
+			case 'multiply':
+				return a * b;
+			case 'divide':
+				return a / b;
+		}
+	},
+);
+
+// Start the server with stdio transport
+const transport = new StdioTransport(server);
+transport.listen();
+```
+
+### HTTP Transport (Web-based)
+
+```javascript
+import { McpServer } from 'tmcp';
+import { ZodJsonSchemaAdapter } from '@tmcp/adapter-zod';
+import { HttpTransport } from '@tmcp/transport-http';
+import { z } from 'zod';
+
+const adapter = new ZodJsonSchemaAdapter();
+const server = new McpServer(/* ... same server config ... */);
+
+// Add tools as above...
+
+// Create HTTP transport
+const transport = new HttpTransport(server);
+
+// Use with your preferred HTTP server (Bun example)
+Bun.serve({
+	port: 3000,
+	async fetch(req) {
+		const response = await transport.respond(req);
+		if (response === null) {
+			return new Response('Not Found', { status: 404 });
+		}
+		return response;
+	},
+});
+```
+
+## API Reference
+
+### McpServer
+
+The main server class that handles MCP protocol communications.
+
+#### Constructor
+
+```javascript
+new McpServer(serverInfo, options);
+```
+
+- `serverInfo`: Server metadata (name, version, description)
+- `options`: Configuration object with adapter and capabilities
+
+#### Methods
+
+##### `tool(definition, handler)`
+
+Register a tool with optional schema validation.
+
+```javascript
+server.tool(
+	{
+		name: 'tool-name',
+		description: 'Tool description',
+		schema: yourSchema, // optional
+	},
+	async (input) => {
+		// Tool implementation
+		return result;
+	},
+);
+```
+
+##### `prompt(definition, handler)`
+
+Register a prompt template with optional schema validation.
+
+```javascript
+server.prompt(
+  {
+	name: 'prompt-name',
+	description: 'Prompt description',
+	schema: yourSchema, // optional
+	complete: (arg, context) => ['completion1', 'completion2'] // optional
+  },
+  async (input) => {
+	// Prompt implementation
+	return { messages: [...] };
+  }
+);
+```
+
+##### `resource(definition, handler)`
+
+Register a static resource.
+
+```javascript
+server.resource(
+  {
+	name: 'resource-name',
+	description: 'Resource description',
+	uri: 'file://path/to/resource'
+  },
+  async (uri, params) => {
+	// Resource implementation
+	return { contents: [...] };
+  }
+);
+```
+
+##### `template(definition, handler)`
+
+Register a URI template for dynamic resources.
+
+```javascript
+server.template(
+  {
+	name: 'template-name',
+	description: 'Template description',
+	uri: 'file://path/{id}/resource',
+	complete: (arg, context) => ['id1', 'id2'] // optional
+  },
+  async (uri, params) => {
+	// Template implementation using params.id
+	return { contents: [...] };
+  }
+);
+```
+
+##### `receive(request)`
+
+Process an incoming MCP request.
+
+```javascript
+const response = server.receive(jsonRpcRequest);
+```
+
+## Advanced Examples
+
+### Multiple Schema Libraries
+
+```javascript
+// Use different schemas for different tools
+import { z } from 'zod';
+import * as v from 'valibot';
+
+server.tool(
+	{
+		name: 'zod-tool',
+		schema: z.object({ name: z.string() }),
+	},
+	async ({ name }) => `Hello ${name}`,
+);
+
+server.tool(
+	{
+		name: 'valibot-tool',
+		schema: v.object({ age: v.number() }),
+	},
+	async ({ age }) => `Age: ${age}`,
+);
+```
+
+### Resource Templates with Completion
+
+```javascript
+server.template(
+	{
+		name: 'user-profile',
+		description: 'Get user profile by ID',
+		uri: 'users/{userId}/profile',
+		complete: (arg, context) => {
+			// Provide completions for userId parameter
+			return ['user1', 'user2', 'user3'];
+		},
+	},
+	async (uri, params) => {
+		const user = await getUserById(params.userId);
+		return {
+			contents: [
+				{
+					uri,
+					mimeType: 'application/json',
+					text: JSON.stringify(user),
+				},
+			],
+		};
+	},
+);
+```
+
+### Complex Validation
+
+```javascript
+const complexSchema = z.object({
+	user: z.object({
+		name: z.string().min(1),
+		email: z.string().email(),
+		age: z.number().min(18).max(120),
+	}),
+	preferences: z
+		.object({
+			theme: z.enum(['light', 'dark']),
+			notifications: z.boolean(),
+		})
+		.optional(),
+	tags: z.array(z.string()).default([]),
+});
+
+server.tool(
+	{
+		name: 'create-user',
+		description: 'Create a new user with preferences',
+		schema: complexSchema,
+	},
+	async (input) => {
+		// Input is fully typed and validated
+		const { user, preferences, tags } = input;
+		return await createUser(user, preferences, tags);
+	},
+);
+```
+
+## Contributing
+
+Contributions are welcome! Please see our [contributing guidelines](../../CONTRIBUTING.md) for details.
+
+## Acknowledgments
+
+Huge thanks to Sean O'Bannon that provided us with the `@tmcp` scope on npm.
+
+## License
+
+MIT © Paolo Ricciuti

documentation/docs/10-introduction/10-overview.md

@@ -0,0 +1,44 @@
+---
+title: Overview
+---
+
+The Svelte MCP ([Model Context Protocol](https://modelcontextprotocol.io/docs/getting-started/intro)) server can help your LLM or agent of choice write better Svelte code. It works by providing documentation relevant to the task at hand, and statically analysing generated code so that it can suggest fixes and best practices.
+
+## Setup
+
+The setup varies based on the version of the MCP you prefer — remote or local — and your chosen MCP client (e.g. Claude Code, Codex CLI or GitHub Copilot):
+
+- [local setup](local-setup) using `@sveltejs/mcp`
+- [remote setup](remote-setup) using `https://mcp.svelte.dev/mcp`
+
+## Usage
+
+To get the most out of the MCP server we recommend including the following prompt in your [`AGENTS.md`](https://agents.md) (or [`CLAUDE.md`](https://docs.claude.com/en/docs/claude-code/memory#claude-md-imports), if using Claude Code). This will tell the LLM which tools are available and when it's appropriate to use them.
+
+```md
+You are able to use the Svelte MCP server, where you have access to comprehensive Svelte 5 and SvelteKit documentation. Here's how to use the available tools effectively:
+
+## Available MCP Tools:
+
+### 1. list-sections
+
+Use this FIRST to discover all available documentation sections. Returns a structured list with titles, use_cases, and paths.
+When asked about Svelte or SvelteKit topics, ALWAYS use this tool at the start of the chat to find relevant sections.
+
+### 2. get-documentation
+
+Retrieves full documentation content for specific sections. Accepts single or multiple sections.
+After calling the list-sections tool, you MUST analyze the returned documentation sections (especially the use_cases field) and then use the get-documentation tool to fetch ALL documentation sections that are relevant for the user's task.
+
+### 3. svelte-autofixer
+
+Analyzes Svelte code and returns issues and suggestions.
+You MUST use this tool whenever writing Svelte code before sending it to the user. Keep calling it until no issues or suggestions are returned.
+
+### 4. playground-link
+
+Generates a Svelte Playground link with the provided code.
+After completing the code, ask the user if they want a playground link. Only call this tool after user confirmation and NEVER if code was written to files in their project.
+```
+
+If your MCP client supports it, we also recommend using the [svelte-task](prompts#svelte-task) prompt to instruct the LLM on the best way to use the MCP server.

documentation/docs/10-introduction/index.md

@@ -0,0 +1,3 @@
+---
+title: Introduction
+---

documentation/docs/20-setup/20-local-setup.md

@@ -0,0 +1,132 @@
+---
+title: Local setup
+---
+
+The local (or stdio) version of the MCP server is available via the [`@sveltejs/mcp`](https://www.npmjs.com/package/@sveltejs/mcp) npm package. You can either install it globally and then reference it in your configuration or run it with `npx`:
+
+```bash
+npx -y @sveltejs/mcp
+```
+
+Here's how to set it up in some common MCP clients:
+
+## Claude Code
+
+To include the local MCP version in Claude Code, simply run the following command:
+
+```bash
+claude mcp add -t stdio -s [scope] svelte -- npx -y @sveltejs/mcp
+```
+
+The `[scope]` must be `user`, `project` or `local`.
+
+## Claude Desktop
+
+In the Settings > Developer section, click on Edit Config. It will open the folder with a `claude_desktop_config.json` file in it. Edit the file to include the following configuration:
+
+```json
+{
+	"mcpServers": {
+		"svelte": {
+			"command": "npx",
+			"args": ["-y", "@sveltejs/mcp"]
+		}
+	}
+}
+```
+
+## Codex CLI
+
+Add the following to your `config.toml` (which defaults to `~/.codex/config.toml`, but refer to [the configuration documentation](https://github.com/openai/codex/blob/main/docs/config.md) for more advanced setups):
+
+```toml
+[mcp_servers.svelte]
+command = "npx"
+args = ["-y", "@sveltejs/mcp"]
+```
+
+## Gemini CLI
+
+To include the local MCP version in Gemini CLI, simply run the following command:
+
+```bash
+gemini mcp add -t stdio -s [scope] svelte npx -y @sveltejs/mcp
+```
+
+The `[scope]` must be `user`, `project` or `local`.
+
+## OpenCode
+
+Run the command:
+
+```bash
+opencode mcp add
+```
+
+and follow the instructions, selecting 'Local' under the 'Select MCP server type' prompt:
+
+```bash
+opencode mcp add
+
+┌  Add MCP server
+│
+◇  Enter MCP server name
+│  svelte
+│
+◇  Select MCP server type
+│  Local
+│
+◆  Enter command to run
+│  npx -y @sveltejs/mcp
+```
+
+## VS Code
+
+- Open the command palette
+- Select "MCP: Add Server..."
+- Select "Command (stdio)"
+- Insert `npx -y @sveltejs/mcp` in the input and press `Enter`
+- When prompted for a name, insert `svelte`
+- Select if you want to add it as a `Global` or `Workspace` MCP server
+
+## Cursor
+
+- Open the command palette
+- Select "View: Open MCP Settings"
+- Click on "Add custom MCP"
+
+It will open a file with your MCP servers where you can add the following configuration:
+
+```json
+{
+	"mcpServers": {
+		"svelte": {
+			"command": "npx",
+			"args": ["-y", "@sveltejs/mcp"]
+		}
+	}
+}
+```
+
+## Zed
+
+- Open the command palette
+- Search and select "agent:open settings"
+- In settings panel look for `Model Context Protocol (MCP) Servers`
+- Click on "Add Server"
+- Select: "Add Custom Server"
+
+It will open a popup with MCP server config where you can add the following configuration:
+
+```json
+{
+	"svelte": {
+		"command": "npx",
+		"args": ["-y", "@sveltejs/mcp"]
+	}
+}
+```
+
+## Other clients
+
+If we didn't include the MCP client you are using, refer to their documentation for `stdio` servers and use `npx` as the command and `-y @sveltejs/mcp` as the arguments.

documentation/docs/20-setup/30-remote-setup.md

@@ -0,0 +1,101 @@
+---
+title: Remote setup
+---
+
+The remote version of the MCP server is available at `https://mcp.svelte.dev/mcp`.
+
+Here's how to set it up in some common MCP clients:
+
+## Claude Code
+
+To include the remote MCP version in Claude Code, simply run the following command:
+
+```bash
+claude mcp add -t http -s [scope] svelte https://mcp.svelte.dev/mcp
+```
+
+You can choose your preferred `scope` (it must be `user`, `project` or `local`) and `name`.
+
+## Claude Desktop
+
+- Open Settings > Connectors
+- Click on Add Custom Connector
+- When prompted for a name, enter `svelte`
+- Under the Remote MCP server URL input, use `https://mcp.svelte.dev/mcp`
+- Click Add
+
+## Codex CLI
+
+Add the following to your `config.toml` (which defaults to `~/.codex/config.toml`, but refer to [the configuration documentation](https://github.com/openai/codex/blob/main/docs/config.md) for more advanced setups):
+
+```toml
+experimental_use_rmcp_client = true
+[mcp_servers.svelte]
+url = "https://mcp.svelte.dev/mcp"
+```
+
+## Gemini CLI
+
+To use the remote MCP server with Gemini CLI, simply run the following command:
+
+```bash
+gemini mcp add -t http -s [scope] svelte https://mcp.svelte.dev/mcp
+```
+
+The `[scope]` must be `user`, `project` or `local`.
+
+## OpenCode
+
+Run the command:
+
+```bash
+opencode mcp add
+```
+
+and follow the instructions, selecting 'Remote' under the 'Select MCP server type' prompt:
+
+```bash
+opencode mcp add
+
+┌  Add MCP server
+│
+◇  Enter MCP server name
+│  svelte
+│
+◇  Select MCP server type
+│  Remote
+│
+◇  Enter MCP server URL
+│  https://mcp.svelte.dev/mcp
+```
+
+## VS Code
+
+- Open the command palette
+- Select "MCP: Add Server..."
+- Select "HTTP (HTTP or Server-Sent-Events)"
+- Insert `https://mcp.svelte.dev/mcp` in the input and press `Enter`
+- Insert your preferred name
+- Select if you want to add it as a `Global` or `Workspace` MCP server
+
+## Cursor
+
+- Open the command palette
+- Select "View: Open MCP Settings"
+- Click on "Add custom MCP"
+
+It will open a file with your MCP servers where you can add the following configuration:
+
+```json
+{
+	"mcpServers": {
+		"svelte": {
+			"url": "https://mcp.svelte.dev/mcp"
+		}
+	}
+}
+```
+
+## Other clients
+
+If we didn't include the MCP client you are using, refer to their documentation for `remote` servers and use `https://mcp.svelte.dev/mcp` as the URL.

documentation/docs/20-setup/index.md

@@ -0,0 +1,3 @@
+---
+title: Setup
+---

documentation/docs/30-capabilities/10-tools.md

@@ -0,0 +1,21 @@
+---
+title: Tools
+---
+
+The following tools are provided by the MCP server to the model you are using, which can decide to call one or more of them during a session:
+
+## list-sections
+
+Provides a list of all the available documentation sections.
+
+## get-documentation
+
+Allows the model to get the full (and up-to-date) documentation for the requested sections directly from [svelte.dev/docs](/docs).
+
+## svelte-autofixer
+
+Uses static analysis to provide suggestions for code that your LLM generates. It can be invoked in an agentic loop by your model until all issues and suggestions are resolved.
+
+## playground-link
+
+Generates an ephemeral playground link with the generated code. It's useful when the generated code is not written to a file in your project and you want to quickly test the generated solution. The code is not stored anywhere except the URL itself (which will often, as a consequence, be quite large).

documentation/docs/30-capabilities/20-resources.md

@@ -0,0 +1,9 @@
+---
+title: Resources
+---
+
+This is the list of available resources provided by the MCP server. Resources are included by the user (not by the LLM) and are useful if you want to include specific knowledge in your session. For example, if you know that the component will need to use transitions you can include the transition documentation directly without asking the LLM to do it for you.
+
+## doc-section
+
+This dynamic resource allows you to add every section of the Svelte documentation as a resource. The URI looks like this `svelte://slug-of-the-docs.md` and the returned resource will contain the `llms.txt` version of the specific page you selected.

documentation/docs/30-capabilities/30-prompts.md

@@ -0,0 +1,9 @@
+---
+title: Prompts
+---
+
+This is the list of available prompts provided by the MCP server. Prompts are selected by the user and are sent as a user message. They can be useful to write repetitive instructions for the LLM on how to properly use the MCP server.
+
+## svelte-task
+
+This prompt should be used whenever you are asking the model to work on a Svelte-related task. It will instruct the LLM which documentation sections are available, which tools to invoke, when to invoke them, and how to interpret the results.

documentation/docs/30-capabilities/index.md

@@ -0,0 +1,3 @@
+---
+title: Capabilities
+---

documentation/docs/index.md

@@ -0,0 +1,3 @@
+---
+title: MCP
+---

eslint.config.js

@@ -5,15 +5,20 @@ import svelte from 'eslint-plugin-svelte';
 import globals from 'globals';
 import { fileURLToPath } from 'node:url';
 import ts from 'typescript-eslint';
-import svelteConfig from './svelte.config.js';
+import svelteConfig from './apps/mcp-remote/svelte.config.js';
+import eslint_plugin_import from 'eslint-plugin-import';
 
-const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));
+const gitignore_path = fileURLToPath(new URL('./.gitignore', import.meta.url));
 
-export default ts.config(
-	includeIgnoreFile(gitignorePath),
+export default /** @type {import("eslint").Linter.Config} */ ([
+	includeIgnoreFile(gitignore_path),
+	{
+		ignores: ['.claude/**/*'],
+	},
 	js.configs.recommended,
 	...ts.configs.recommended,
 	...svelte.configs.recommended,
+	eslint_plugin_import.flatConfigs.recommended,
 	prettier,
 	...svelte.configs.prettier,
 	{
@@ -24,6 +29,27 @@ export default ts.config(
 			// typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
 			// see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
 			'no-undef': 'off',
+			'@typescript-eslint/naming-convention': [
+				'error',
+				{
+					selector: ['variableLike'],
+					format: ['snake_case', 'UPPER_CASE'],
+					leadingUnderscore: 'allow',
+				},
+			],
+			'func-style': ['error', 'declaration', { allowTypeAnnotation: true }],
+			'import/no-unresolved': 'off', // this doesn't work well with typescript path mapping
+			'import/extensions': [
+				'error',
+				'ignorePackages',
+				{
+					js: 'always',
+					mjs: 'always',
+					cjs: 'always',
+					ts: 'always',
+					svelte: 'always',
+				},
+			],
 		},
 	},
 	{
@@ -37,4 +63,4 @@ export default ts.config(
 			},
 		},
 	},
-);
+]);

package.json

@@ -1,33 +1,25 @@
 {
-	"name": "@sveltejs/mcp",
+	"name": "@sveltejs/mcp-mono",
 	"version": "0.0.1",
 	"description": "The official Svelte MCP server implementation",
 	"type": "module",
-	"main": "src/index.js",
-	"bin": {
-		"svelte-mcp": "./dist/lib/stdio.js"
-	},
+	"packageManager": "pnpm@10.18.1",
 	"scripts": {
-		"start": "node src/index.js",
-		"dev": "vite dev",
-		"build": "vite build",
-		"build:mcp": "tsc --project tsconfig.build.json",
-		"prepublishOnly": "pnpm build:mcp",
-		"preview": "vite preview",
-		"prepare": "svelte-kit sync || echo ''",
-		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
-		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"build": "pnpm -r run build",
+		"dev": "pnpm --filter @sveltejs/mcp-remote run dev",
+		"check": "pnpm -r run check",
+		"check:publint": "pnpm -r run check:publint",
 		"format": "prettier --write .",
 		"lint": "prettier --check . && eslint .",
 		"lint:fix": "prettier --write . && eslint . --fix",
 		"test:unit": "vitest",
 		"test": "npm run test:unit -- --run",
 		"test:watch": "npm run test:unit -- --watch",
-		"db:push": "drizzle-kit push",
-		"db:generate": "drizzle-kit generate",
-		"db:migrate": "drizzle-kit migrate",
-		"db:studio": "drizzle-kit studio",
-		"inspect": "DANGEROUSLY_OMIT_AUTH=true npx @modelcontextprotocol/inspector"
+		"inspect": "pnpm mcp-inspector",
+		"generate-summaries": "pnpm --filter @sveltejs/mcp-server run generate-summaries",
+		"debug:generate-summaries": "pnpm --filter @sveltejs/mcp-server run debug:generate-summaries",
+		"release": "pnpm --filter @sveltejs/mcp run build && changeset publish",
+		"changeset:version": "changeset version && pnpm --filter @sveltejs/mcp run update:version && git add --all"
 	},
 	"keywords": [
 		"svelte",
@@ -37,44 +29,23 @@
 	],
 	"private": true,
 	"devDependencies": {
-		"@eslint/compat": "^1.2.5",
-		"@eslint/js": "^9.18.0",
-		"@libsql/client": "^0.14.0",
-		"@modelcontextprotocol/inspector": "^0.16.7",
-		"@sveltejs/adapter-vercel": "^5.6.3",
-		"@sveltejs/kit": "^2.22.0",
-		"@sveltejs/vite-plugin-svelte": "^6.0.0",
-		"@types/eslint-scope": "^8.3.2",
-		"@types/estree": "^1.0.8",
-		"@types/node": "^24.3.1",
-		"@typescript-eslint/types": "^8.43.0",
-		"dotenv": "^17.2.2",
-		"drizzle-kit": "^0.30.2",
-		"drizzle-orm": "^0.40.0",
-		"eslint": "^9.18.0",
+		"@changesets/cli": "^2.29.7",
+		"@eslint/compat": "^1.3.2",
+		"@eslint/js": "^9.36.0",
+		"@modelcontextprotocol/inspector": "^0.17.0",
+		"@svitejs/changesets-changelog-github-compact": "^1.2.0",
+		"eslint": "^9.36.0",
 		"eslint-config-prettier": "^10.0.1",
-		"eslint-plugin-svelte": "^3.0.0",
+		"eslint-plugin-import": "^2.32.0",
+		"eslint-plugin-svelte": "^3.12.3",
 		"globals": "^16.0.0",
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",
-		"svelte": "^5.0.0",
-		"svelte-check": "^4.0.0",
+		"publint": "^0.3.13",
 		"typescript": "^5.0.0",
-		"typescript-eslint": "^8.20.0",
-		"vite": "^7.0.4",
-		"vite-plugin-devtools-json": "^1.0.0",
+		"typescript-eslint": "^8.44.1",
 		"vitest": "^3.2.3"
 	},
-	"dependencies": {
-		"@tmcp/adapter-valibot": "^0.1.4",
-		"@tmcp/transport-http": "^0.6.0",
-		"@tmcp/transport-stdio": "^0.1.3",
-		"@typescript-eslint/parser": "^8.43.0",
-		"svelte-eslint-parser": "^1.3.2",
-		"tmcp": "^1.12.2",
-		"valibot": "^1.1.0",
-		"zimmerframe": "^1.1.4"
-	},
 	"pnpm": {
 		"onlyBuiltDependencies": [
 			"esbuild"

packages/mcp-schema/package.json

@@ -0,0 +1,19 @@
+{
+	"name": "@sveltejs/mcp-schema",
+	"version": "0.0.1",
+	"private": true,
+	"description": "",
+	"main": "index.js",
+	"exports": {
+		".": "./src/index.js",
+		"./utils": "./src/utils.js",
+		"./schema": "./src/schema.js"
+	},
+	"keywords": [],
+	"author": "",
+	"license": "ISC",
+	"type": "module",
+	"dependencies": {
+		"drizzle-orm": "^0.44.0"
+	}
+}

packages/mcp-schema/src/index.js

@@ -0,0 +1,8 @@
+/**
+ * @import * as schema from './schema.js'
+ */
+export * from './schema.js';
+
+/**
+ * @typedef {typeof schema} Schema
+ */

packages/mcp-schema/src/schema.js

@@ -1,5 +1,5 @@
 import { integer, sqliteTable, text } from 'drizzle-orm/sqlite-core';
-import { float_32_array } from './utils';
+import { float_32_array } from './utils.js';
 
 /**
  * NOTE: if you modify a schema adding a vector column you need to manually add this
@@ -40,10 +40,7 @@ export const distillation_jobs = sqliteTable('distillation_jobs', {
 	started_at: integer('started_at', { mode: 'timestamp' }),
 	completed_at: integer('completed_at', { mode: 'timestamp' }),
 	error_message: text('error_message'),
-	metadata: text('metadata', { mode: 'json' })
-		.$type<Record<string, unknown>>()
-		.notNull()
-		.default({}),
+	metadata: text('metadata', { mode: 'json' }).notNull().default({}),
 	created_at: integer('created_at', { mode: 'timestamp' })
 		.notNull()
 		.$defaultFn(() => new Date()),
@@ -59,10 +56,7 @@ export const content = sqliteTable('content', {
 	content: text('content').notNull(),
 	size_bytes: integer('size_bytes').notNull(),
 	embeddings: float_32_array('embeddings', { dimensions: 1024 }),
-	metadata: text('metadata', { mode: 'json' })
-		.$type<Record<string, unknown>>()
-		.notNull()
-		.default({}),
+	metadata: text('metadata', { mode: 'json' }).notNull().default({}),
 	created_at: integer('created_at', { mode: 'timestamp' })
 		.notNull()
 		.$defaultFn(() => new Date()),
@@ -78,10 +72,7 @@ export const content_distilled = sqliteTable('content_distilled', {
 	content: text('content').notNull(),
 	size_bytes: integer('size_bytes').notNull(),
 	embeddings: float_32_array('embeddings', { dimensions: 1024 }),
-	metadata: text('metadata', { mode: 'json' })
-		.$type<Record<string, unknown>>()
-		.notNull()
-		.default({}),
+	metadata: text('metadata', { mode: 'json' }).notNull().default({}),
 	created_at: integer('created_at', { mode: 'timestamp' })
 		.notNull()
 		.$defaultFn(() => new Date()),

packages/mcp-schema/src/utils.js

@@ -1,19 +1,22 @@
-import { sql, Column } from 'drizzle-orm';
+/**
+ * @import { Column } from 'drizzle-orm';
+ */
+import { sql } from 'drizzle-orm';
 import { customType } from 'drizzle-orm/sqlite-core';
 
 /**
  * Helper function to convert an array of embeddings into a format that can be inserted into a LibSQL vector column.
- * @param arr The embeddings array.
+ * @param {number[]} arr The embeddings array.
  */
-export function vector(arr: number[]) {
+export function vector(arr) {
 	return sql`vector32(${JSON.stringify(arr)})`;
 }
 
 /**
  * Helper function to calculate the distance between a vector column and an array of embeddings and return it as a columns.
- * @param column The drizzle column representing the vector.
- * @param arr The embeddings array.
- * @param as The name of the returned column. Default is 'distance'.
+ * @param {Column} column The drizzle column representing the vector.
+ * @param {number} arr The embeddings array.
+ * @param {string} as The name of the returned column. Default is 'distance'.
  *
  * @example
  * await db.select({
@@ -25,8 +28,10 @@ export function vector(arr: number[]) {
  * .orderBy(sql`distance`)
  * .execute();
  */
-export function distance(column: Column, arr: number[], as = 'distance') {
-	return sql<number>`CASE ${column} ISNULL WHEN 1 THEN 1 ELSE vector_distance_cos(${column}, vector32(${JSON.stringify(arr)})) END`.as(
+export function distance(column, arr, as = 'distance') {
+	return /** @type {typeof sql<number>} */ (
+		sql
+	)`CASE ${column} ISNULL WHEN 1 THEN 1 ELSE vector_distance_cos(${column}, vector32(${JSON.stringify(arr)})) END`.as(
 		as,
 	);
 }
@@ -34,19 +39,27 @@ export function distance(column: Column, arr: number[], as = 'distance') {
 /**
  * Custom drizzle type to use the LibSQL vector column type.
  */
-export const float_32_array = customType<{
+export const float_32_array = /** @type {typeof customType<{
 	data: number[];
 	config: { dimensions: number };
 	configRequired: true;
 	driverData: Buffer;
-}>({
+}>} */ (customType)({
 	dataType(config) {
 		return `F32_BLOB(${config.dimensions})`;
 	},
-	fromDriver(value: Buffer) {
+	/**
+	 * @param {Buffer} value
+	 */
+	fromDriver(value) {
 		return Array.from(new Float32Array(value.buffer));
 	},
-	toDriver(value: number[]) {
+	/**
+	 *
+	 * @param {number[]} value
+	 * @returns
+	 */
+	toDriver(value) {
 		return vector(value);
 	},
 });

packages/mcp-server/.env.example

@@ -0,0 +1,2 @@
+# Anthropic API Key from: https://console.anthropic.com/
+ANTHROPIC_API_KEY=your_api_key_here

packages/mcp-server/package.json

@@ -0,0 +1,45 @@
+{
+	"name": "@sveltejs/mcp-server",
+	"version": "0.0.1",
+	"private": true,
+	"description": "",
+	"main": "index.js",
+	"keywords": [],
+	"author": "",
+	"license": "ISC",
+	"type": "module",
+	"scripts": {
+		"test": "vitest",
+		"generate-summaries": "node scripts/generate-summaries.ts --experimental-strip-types",
+		"debug:generate-summaries": "DEBUG_MODE=1 node scripts/generate-summaries.ts --experimental-strip-types"
+	},
+	"exports": {
+		".": "./src/index.ts"
+	},
+	"peerDependencies": {
+		"drizzle-orm": "^0.44.0"
+	},
+	"dependencies": {
+		"@sveltejs/mcp-schema": "workspace:^",
+		"@tmcp/adapter-valibot": "^0.1.4",
+		"@typescript-eslint/parser": "^8.44.0",
+		"eslint": "^9.36.0",
+		"eslint-plugin-svelte": "^3.12.3",
+		"svelte": "^5.39.2",
+		"svelte-eslint-parser": "^1.3.2",
+		"tmcp": "^1.13.0",
+		"ts-blank-space": "^0.6.2",
+		"typescript-eslint": "^8.44.0",
+		"valibot": "^1.1.0",
+		"vitest": "^3.2.4",
+		"zimmerframe": "^1.1.4"
+	},
+	"devDependencies": {
+		"@anthropic-ai/sdk": "^0.65.0",
+		"@sveltejs/kit": "^2.42.2",
+		"@types/eslint-scope": "^8.3.2",
+		"@types/estree": "^1.0.8",
+		"@typescript-eslint/types": "^8.44.0",
+		"dotenv": "^17.2.3"
+	}
+}

packages/mcp-server/scripts/generate-summaries.ts

@@ -0,0 +1,244 @@
+#!/usr/bin/env node
+import 'dotenv/config';
+import { writeFile, mkdir } from 'fs/promises';
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { get_sections } from '../src/mcp/utils.ts';
+import { AnthropicProvider } from '../src/lib/anthropic.ts';
+import { type AnthropicBatchRequest, type SummaryData } from '../src/lib/schemas.ts';
+
+const current_filename = fileURLToPath(import.meta.url);
+const current_dirname = path.dirname(current_filename);
+
+const USE_CASES_PROMPT = `
+You are tasked with analyzing Svelte 5 and SvelteKit documentation pages to identify when they would be useful.
+
+Your task:
+1. Read the documentation page content provided
+2. Identify the main use cases, scenarios, or queries where this documentation would be relevant
+3. Create a VERY SHORT, comma-separated list of use cases (maximum 200 characters total)
+4. Think about what a developer might be trying to build or accomplish when they need this documentation
+
+Guidelines:
+- Focus on WHEN this documentation would be needed, not WHAT it contains
+- Consider specific project types (e.g., "e-commerce site", "blog", "dashboard", "social media app")
+- Consider specific features (e.g., "authentication", "forms", "data fetching", "animations")
+- Consider specific components (e.g., "slider", "modal", "dropdown", "card")
+- Consider development stages (e.g., "project setup", "deployment", "testing", "migration")
+- Use "always" for fundamental concepts that apply to virtually all Svelte projects
+- Be concise but specific
+- Use lowercase
+- Separate multiple use cases with commas
+
+Examples of good use_cases:
+- "always, any svelte project, core reactivity"
+- "authentication, login systems, user management"
+- "e-commerce, product listings, shopping carts"
+- "forms, user input, data submission"
+- "deployment, production builds, hosting setup"
+- "animation, transitions, interactive ui"
+- "routing, navigation, multi-page apps"
+- "blog, content sites, markdown rendering"
+
+Requirements:
+- Maximum 200 characters (including spaces and commas)
+- Lowercase only
+- Comma-separated list of use cases
+- Focus on WHEN/WHY someone would need this, not what it is
+- Be specific about project types, features, or components when applicable
+- Use "always" sparingly, only for truly universal concepts
+- Do not include quotes or special formatting in your response
+- Respond with ONLY the use cases text, no additional text
+
+Here is the documentation page content to analyze:
+
+`;
+
+async function fetch_section_content(url: string) {
+	const response = await fetch(url, { signal: AbortSignal.timeout(30000) });
+	if (!response.ok) {
+		throw new Error(`Failed to fetch ${url}: ${response.status} ${response.statusText}`);
+	}
+	return await response.text();
+}
+
+async function main() {
+	console.log('🚀 Starting use cases generation...');
+
+	// Check for API key
+	const api_key = process.env.ANTHROPIC_API_KEY;
+	if (!api_key) {
+		console.error('❌ Error: ANTHROPIC_API_KEY environment variable is required');
+		console.error('Please set it in packages/mcp-server/.env file or export it:');
+		console.error('export ANTHROPIC_API_KEY=your_api_key_here');
+		process.exit(1);
+	}
+
+	// Get all sections
+	console.log('📚 Fetching documentation sections...');
+	let sections = await get_sections();
+	console.log(`Found ${sections.length} sections`);
+
+	// Debug mode: limit to 2 sections
+	const debug_mode = process.env.DEBUG_MODE === '1';
+	if (debug_mode) {
+		console.log('🐛 DEBUG_MODE enabled - processing only 2 sections');
+		sections = sections.slice(0, 2);
+	}
+
+	// Fetch content for each section
+	console.log('📥 Downloading section content...');
+	const sections_with_content: Array<{
+		section: (typeof sections)[number];
+		content: string;
+		index: number;
+	}> = [];
+	const download_errors: Array<{ section: string; error: string }> = [];
+
+	for (let i = 0; i < sections.length; i++) {
+		const section = sections[i]!;
+		try {
+			console.log(`Fetching ${i + 1}/${sections.length}: ${section.title}`);
+			const content = await fetch_section_content(section.url);
+			sections_with_content.push({
+				section,
+				content,
+				index: i,
+			});
+		} catch (error) {
+			const error_msg = error instanceof Error ? error.message : String(error);
+			console.error(`⚠️  Failed to fetch ${section.title}:`, error_msg);
+			download_errors.push({ section: section.title, error: error_msg });
+		}
+	}
+
+	console.log(`✅ Successfully downloaded ${sections_with_content.length} sections`);
+
+	if (sections_with_content.length === 0) {
+		console.error('❌ No sections were successfully downloaded');
+		process.exit(1);
+	}
+
+	// Initialize Anthropic client
+	console.log('🤖 Initializing Anthropic API...');
+	const anthropic = new AnthropicProvider('claude-sonnet-4-5-20250929', api_key);
+
+	// Prepare batch requests
+	console.log('📦 Preparing batch requests...');
+	const batch_requests: AnthropicBatchRequest[] = sections_with_content.map(
+		({ content, index }) => ({
+			custom_id: `section-${index}`,
+			params: {
+				model: anthropic.get_model_identifier(),
+				max_tokens: 250,
+				messages: [
+					{
+						role: 'user',
+						content: USE_CASES_PROMPT + content,
+					},
+				],
+				temperature: 0,
+			},
+		}),
+	);
+
+	// Create and process batch
+	console.log('🚀 Creating batch job...');
+	const batch_response = await anthropic.create_batch(batch_requests);
+	console.log(`✅ Batch created with ID: ${batch_response.id}`);
+
+	// Poll for completion
+	console.log('⏳ Waiting for batch to complete...');
+	let batch_status = await anthropic.get_batch_status(batch_response.id);
+
+	while (batch_status.processing_status === 'in_progress') {
+		const { succeeded, processing, errored } = batch_status.request_counts;
+		console.log(`  Progress: ${succeeded} succeeded, ${processing} processing, ${errored} errored`);
+		await new Promise((resolve) => setTimeout(resolve, 5000));
+		batch_status = await anthropic.get_batch_status(batch_response.id);
+	}
+
+	console.log('✅ Batch processing completed!');
+
+	// Get results
+	if (!batch_status.results_url) {
+		throw new Error('Batch completed but no results URL available');
+	}
+
+	console.log('📥 Downloading results...');
+	const results = await anthropic.get_batch_results(batch_status.results_url);
+
+	// Process results
+	console.log('📊 Processing results...');
+	const summaries: Record<string, string> = {};
+	const errors: Array<{ section: string; error: string }> = [];
+
+	for (const result of results) {
+		const index = parseInt(result.custom_id.split('-')[1] ?? '0');
+		const section_data = sections_with_content.find((s) => s.index === index);
+
+		if (!section_data) {
+			console.warn(`⚠️  Could not find section for index ${index}`);
+			continue;
+		}
+
+		const { section } = section_data;
+
+		if (result.result.type !== 'succeeded' || !result.result.message) {
+			const error_msg = result.result.error?.message || 'Failed or no message';
+			console.error(`  ❌ ${section.title}: ${error_msg}`);
+			errors.push({ section: section.title, error: error_msg });
+			continue;
+		}
+
+		const output_content = result.result.message.content[0]?.text;
+		if (output_content) {
+			summaries[section.slug] = output_content.trim();
+			console.log(`  ✅ ${section.title}`);
+		}
+	}
+
+	// Write output to JSON file
+	console.log('💾 Writing results to file...');
+	const output_path = path.join(current_dirname, '../src/use_cases.json');
+	const output_dir = path.dirname(output_path);
+
+	await mkdir(output_dir, { recursive: true });
+
+	const summary_data: SummaryData = {
+		generated_at: new Date().toISOString(),
+		model: anthropic.get_model_identifier(),
+		total_sections: sections.length,
+		successful_summaries: Object.keys(summaries).length,
+		failed_summaries: errors.length,
+		summaries,
+		errors: errors.length > 0 ? errors : undefined,
+		download_errors: download_errors.length > 0 ? download_errors : undefined,
+	};
+
+	await writeFile(output_path, JSON.stringify(summary_data, null, 2), 'utf-8');
+
+	// Print summary
+	console.log('\n📊 Summary:');
+	console.log(`  Total sections: ${sections.length}`);
+	console.log(`  Successfully downloaded: ${sections_with_content.length}`);
+	console.log(`  Download failures: ${download_errors.length}`);
+	console.log(`  Successfully analyzed: ${Object.keys(summaries).length}`);
+	console.log(`  Analysis failures: ${errors.length}`);
+	console.log(`\n✅ Results written to: ${output_path}`);
+
+	if (download_errors.length > 0) {
+		console.log('\n⚠️  Some sections failed to download:');
+		download_errors.forEach((e) => console.log(`  - ${e.section}: ${e.error}`));
+	}
+
+	if (errors.length > 0) {
+		console.log('\n⚠️  Some sections failed to analyze:');
+		errors.forEach((e) => console.log(`  - ${e.section}: ${e.error}`));
+	}
+}
+
+main().catch((error) => {
+	console.error('❌ Fatal error:', error);
+	process.exit(1);
+});

packages/mcp-server/scripts/tsconfig.json

@@ -0,0 +1,6 @@
+{
+	"extends": "../../../tsconfig.json",
+	"compilerOptions": {
+		"allowImportingTsExtensions": true
+	}
+}

packages/mcp-server/src/index.ts

@@ -0,0 +1 @@
+export { server, type SvelteMcp } from './mcp/index.js';

packages/mcp-server/src/lib/anthropic.ts

@@ -0,0 +1,172 @@
+import { Anthropic } from '@anthropic-ai/sdk';
+import type { Model } from '@anthropic-ai/sdk/resources/messages/messages.js';
+import * as v from 'valibot';
+import {
+	anthropic_batch_response_schema,
+	anthropic_batch_result_schema,
+	type AnthropicBatchRequest,
+} from './schemas.js';
+
+export class AnthropicProvider {
+	private client: Anthropic;
+	private modelId: Model;
+	private baseUrl: string;
+	private apiKey: string;
+	name = 'Anthropic';
+
+	constructor(model_id: Model, api_key: string) {
+		if (!api_key) {
+			throw new Error('ANTHROPIC_API_KEY is required');
+		}
+		this.apiKey = api_key;
+		this.client = new Anthropic({ apiKey: api_key, timeout: 1800000 });
+		this.modelId = model_id;
+		this.baseUrl = 'https://api.anthropic.com/v1';
+	}
+
+	get_client(): Anthropic {
+		return this.client;
+	}
+
+	get_model_identifier(): Model {
+		return this.modelId;
+	}
+
+	async create_batch(requests: AnthropicBatchRequest[]) {
+		try {
+			const response = await fetch(`${this.baseUrl}/messages/batches`, {
+				method: 'POST',
+				headers: {
+					'x-api-key': this.apiKey,
+					'anthropic-version': '2023-06-01',
+					'content-type': 'application/json',
+				},
+				body: JSON.stringify({ requests }),
+			});
+
+			if (!response.ok) {
+				const error_text = await response.text();
+				throw new Error(
+					`Failed to create batch: ${response.status} ${response.statusText} - ${error_text}`,
+				);
+			}
+
+			const json_data = await response.json();
+			const validated_response = v.safeParse(anthropic_batch_response_schema, json_data);
+
+			if (!validated_response.success) {
+				throw new Error(
+					`Invalid batch response from Anthropic API: ${JSON.stringify(validated_response.issues)}`,
+				);
+			}
+
+			return validated_response.output;
+		} catch (error) {
+			console.error('Error creating batch with Anthropic:', error);
+			throw new Error(
+				`Failed to create batch: ${error instanceof Error ? error.message : String(error)}`,
+			);
+		}
+	}
+
+	async get_batch_status(batch_id: string, max_retries = 10, retry_delay = 30000) {
+		let retry_count = 0;
+
+		while (retry_count <= max_retries) {
+			try {
+				const response = await fetch(`${this.baseUrl}/messages/batches/${batch_id}`, {
+					method: 'GET',
+					headers: {
+						'x-api-key': this.apiKey,
+						'anthropic-version': '2023-06-01',
+					},
+				});
+
+				if (!response.ok) {
+					const error_text = await response.text();
+					throw new Error(
+						`Failed to get batch status: ${response.status} ${response.statusText} - ${error_text}`,
+					);
+				}
+
+				const json_data = await response.json();
+				const validated_response = v.safeParse(anthropic_batch_response_schema, json_data);
+
+				if (!validated_response.success) {
+					throw new Error(
+						`Invalid batch status response from Anthropic API: ${JSON.stringify(validated_response.issues)}`,
+					);
+				}
+
+				return validated_response.output;
+			} catch (error) {
+				retry_count++;
+
+				if (retry_count > max_retries) {
+					console.error(
+						`Error getting batch status for ${batch_id} after ${max_retries} retries:`,
+						error,
+					);
+					throw new Error(
+						`Failed to get batch status after ${max_retries} retries: ${
+							error instanceof Error ? error.message : String(error)
+						}`,
+					);
+				}
+
+				console.warn(
+					`Error getting batch status for ${batch_id} (attempt ${retry_count}/${max_retries}):`,
+					error,
+				);
+				console.log(`Retrying in ${retry_delay / 1000} seconds...`);
+
+				await new Promise((resolve) => setTimeout(resolve, retry_delay));
+			}
+		}
+
+		// This should never be reached due to the throw in the catch block, but TypeScript needs a return
+		throw new Error(`Failed to get batch status for ${batch_id} after ${max_retries} retries`);
+	}
+
+	async get_batch_results(results_url: string) {
+		try {
+			const response = await fetch(results_url, {
+				method: 'GET',
+				headers: {
+					'x-api-key': this.apiKey,
+					'anthropic-version': '2023-06-01',
+				},
+			});
+
+			if (!response.ok) {
+				const error_text = await response.text();
+				throw new Error(
+					`Failed to get batch results: ${response.status} ${response.statusText} - ${error_text}`,
+				);
+			}
+
+			const text = await response.text();
+			// Parse JSONL format (one JSON object per line)
+			const parsed_results = text
+				.split('\n')
+				.filter((line) => line.trim())
+				.map((line) => JSON.parse(line));
+
+			// Validate all results
+			const validated_results = v.safeParse(v.array(anthropic_batch_result_schema), parsed_results);
+
+			if (!validated_results.success) {
+				throw new Error(
+					`Invalid batch results from Anthropic API: ${JSON.stringify(validated_results.issues)}`,
+				);
+			}
+
+			return validated_results.output;
+		} catch (error) {
+			console.error(`Error getting batch results:`, error);
+			throw new Error(
+				`Failed to get batch results: ${error instanceof Error ? error.message : String(error)}`,
+			);
+		}
+	}
+}

packages/mcp-server/src/lib/schemas.ts

@@ -0,0 +1,122 @@
+import * as v from 'valibot';
+
+export const documentation_sections_schema = v.record(
+	v.string(),
+	v.object({
+		metadata: v.object({
+			title: v.string(),
+			use_cases: v.optional(v.string()),
+		}),
+		slug: v.string(),
+	}),
+);
+
+// Valibot schemas for Batch API
+export const summary_data_schema = v.object({
+	generated_at: v.string(),
+	model: v.string(),
+	total_sections: v.number(),
+	successful_summaries: v.number(),
+	failed_summaries: v.number(),
+	summaries: v.record(v.string(), v.string()),
+	errors: v.optional(
+		v.array(
+			v.object({
+				section: v.string(),
+				error: v.string(),
+			}),
+		),
+	),
+	download_errors: v.optional(
+		v.array(
+			v.object({
+				section: v.string(),
+				error: v.string(),
+			}),
+		),
+	),
+});
+
+export const anthropic_batch_request_schema = v.object({
+	custom_id: v.string(),
+	params: v.object({
+		model: v.string(),
+		max_tokens: v.number(),
+		messages: v.array(
+			v.object({
+				role: v.union([v.literal('user'), v.literal('assistant')]),
+				content: v.union([
+					v.string(),
+					v.array(
+						v.object({
+							type: v.string(),
+							text: v.string(),
+						}),
+					),
+				]),
+			}),
+		),
+	}),
+});
+
+export const anthropic_batch_response_schema = v.object({
+	id: v.string(),
+	type: v.string(),
+	processing_status: v.union([v.literal('in_progress'), v.literal('ended')]),
+	request_counts: v.object({
+		processing: v.number(),
+		succeeded: v.number(),
+		errored: v.number(),
+		canceled: v.number(),
+		expired: v.number(),
+	}),
+	ended_at: v.nullable(v.string()),
+	created_at: v.string(),
+	expires_at: v.string(),
+	cancel_initiated_at: v.nullable(v.string()),
+	results_url: v.nullable(v.string()),
+});
+
+export const anthropic_batch_result_schema = v.object({
+	custom_id: v.string(),
+	result: v.object({
+		type: v.union([
+			v.literal('succeeded'),
+			v.literal('errored'),
+			v.literal('canceled'),
+			v.literal('expired'),
+		]),
+		message: v.optional(
+			v.object({
+				id: v.string(),
+				type: v.string(),
+				role: v.string(),
+				model: v.string(),
+				content: v.array(
+					v.object({
+						type: v.string(),
+						text: v.string(),
+					}),
+				),
+				stop_reason: v.string(),
+				stop_sequence: v.nullable(v.string()),
+				usage: v.object({
+					input_tokens: v.number(),
+					output_tokens: v.number(),
+				}),
+			}),
+		),
+		error: v.optional(
+			v.object({
+				type: v.string(),
+				message: v.string(),
+			}),
+		),
+	}),
+});
+
+// Export inferred types
+export type SummaryData = v.InferOutput<typeof summary_data_schema>;
+export type AnthropicBatchRequest = v.InferOutput<typeof anthropic_batch_request_schema>;
+export type AnthropicBatchResponse = v.InferOutput<typeof anthropic_batch_response_schema>;
+export type AnthropicBatchResult = v.InferOutput<typeof anthropic_batch_result_schema>;

packages/mcp-server/src/mcp/autofixers/add-autofixers-issues.test.ts

@@ -0,0 +1,690 @@
+import { describe, expect, it } from 'vitest';
+import { add_autofixers_issues } from './add-autofixers-issues.js';
+import { base_runes } from '../../constants.js';
+
+const dollarless_runes = base_runes.map((r) => ({ rune: r.replace('$', '') }));
+
+function run_autofixers_on_code(code: string, desired_svelte_version = 5) {
+	const content = { issues: [], suggestions: [] };
+	add_autofixers_issues(content, code, desired_svelte_version);
+	return content;
+}
+
+function with_possible_inits(title: string, fn: (args: { init: string }) => void) {
+	describe.each([
+		{ init: '$state' },
+		{ init: '$state.raw' },
+		{ init: '$derived' },
+		{ init: '$derived.by' },
+	])(title, fn);
+}
+
+describe('add_autofixers_issues', () => {
+	describe('assign_in_effect', () => {
+		with_possible_inits('($init)', ({ init }) => {
+			it(`should add suggestions when assigning to a stateful variable inside an effect`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					const count = ${init}(0);
+					$effect(() => {
+						count = 43;
+					});
+				</script>`);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+
+			it(`should add a suggestion for each variable assigned within an effect`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					const count = $state(0);
+					const count2 = $state(0);
+					$effect(() => {
+						count = 43;
+						count2 = 44;
+					});
+				</script>`);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(2);
+				expect(content.suggestions).toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+				expect(content.suggestions).toContain(
+					'The stateful variable "count2" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+			it(`should not add a suggestion for variables that are not assigned within an effect`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					const count = ${init}(0);
+				</script>
+
+				<button onclick={() => count = 43}>Increment</button>
+				`);
+
+				expect(content.suggestions).not.toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+
+			it("should not add a suggestions for variables that are assigned within an effect but aren't stateful", () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					const count = 0;
+
+					$effect(() => {
+						count = 43;
+					});
+				</script>`);
+
+				expect(content.suggestions).not.toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+
+			it(`should add a suggestion for variables that are assigned within an effect with an update`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					let count = ${init}(0);
+
+					$effect(() => {
+						count++;
+					});
+				</script>
+				`);
+
+				expect(content.suggestions).toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+
+			it(`should add a suggestion for variables that are mutated within an effect`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					let count = ${init}({ value: 0 });
+
+					$effect(() => {
+						count.value = 42;
+					});
+				</script>
+				`);
+
+				expect(content.suggestions).toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+
+			it(`should add a suggestion for variables that are mutated within an effect.pre`, () => {
+				const content = run_autofixers_on_code(`
+				<script>
+					let count = ${init}({ value: 0 });
+
+					$effect.pre(() => {
+						count.value = 42;
+					});
+				</script>
+				`);
+
+				expect(content.suggestions).toContain(
+					'The stateful variable "count" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.',
+				);
+			});
+		});
+
+		it('should add a suggestion when calling a function inside an effect', () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				import { fetch_data } from './data.js';
+				$effect(() => {
+					fetch_data();
+				});
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				`You are calling the function \`fetch_data\` inside an $effect. Please check if the function is reassigning a stateful variable because that's considered malpractice and check if it could use  \`$derived\` instead. Ignore this suggestion if you are sure this function is not assigning any stateful variable or if you can't check if it does.`,
+			);
+		});
+
+		it('should add a suggestion when calling a function inside an effect (with non identifier callee)', () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				import { fetch_data } from './data.js';
+				$effect(() => {
+					fetch_data.fetch();
+				});
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				`You are calling a function inside an $effect. Please check if the function is reassigning a stateful variable because that's considered malpractice and check if it could use  \`$derived\` instead. Ignore this suggestion if you are sure this function is not assigning any stateful variable or if you can't check if it does.`,
+			);
+		});
+	});
+
+	with_possible_inits('($init)', ({ init }) => {
+		describe.each([{ method: 'set' }, { method: 'update' }])(
+			'wrong_property_access_state ($method)',
+			({ method }) => {
+				it(`should add suggestions when using .${method}() on a stateful variable with a literal init`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}(0);
+				function update_count() {
+					count.${method}(43);
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them.`,
+					);
+				});
+
+				it(`should add suggestions when using .${method}() on a stateful variable with an array init`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}([0]);
+				function update_count() {
+					count.${method}([1]);
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them.`,
+					);
+				});
+
+				it(`should add suggestions when using .${method}() on a stateful variable with conditional if it's not sure if the method could actually be present on the variable (${init}({}))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}({ value: 0 });
+				function update_count() {
+					count.${method}({ value: 43 });
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them. However I can't verify if "count" is a state variable of an object or a class with a "${method}" method on it. Please verify that before updating the code to use a normal assignment`,
+					);
+				});
+
+				it(`should add suggestions when using .${method}() on a stateful variable with conditional if it's not sure if the method could actually be present on the variable (${init}(new Class()))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}(new Class());
+				function update_count() {
+					count.${method}(new Class());
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them. However I can't verify if "count" is a state variable of an object or a class with a "${method}" method on it. Please verify that before updating the code to use a normal assignment`,
+					);
+				});
+
+				it(`should add suggestions when using .${method}() on a stateful variable with conditional if it's not sure if the method could actually be present on the variable (${init}(variable_name))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const { init } = $props();
+				const count = ${init}(init);
+				function update_count() {
+					count.${method}(43);
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them. However I can't verify if "count" is a state variable of an object or a class with a "${method}" method on it. Please verify that before updating the code to use a normal assignment`,
+					);
+				});
+
+				it(`should not add suggestions when using .${method} on a stateful variable if it's not a method call`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}({});
+				function update_count() {
+					console.log(count.${method});
+				}
+			</script>`);
+
+					expect(content.suggestions).not.toContain(
+						`You are trying to update the stateful variable "count" using "${method}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them. However I can't verify if "count" is a state variable of an object or a class with a "${method}" method on it. Please verify that before updating the code to use a normal assignment`,
+					);
+				});
+			},
+		);
+
+		describe.each([{ property: '$' }])(
+			'wrong_property_access_state property ($property)',
+			async ({ property }) => {
+				it(`should add suggestions when reading .${property} on a stateful variable with a literal init`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}(0);
+				function read_count() {
+					count.${property};
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to read the stateful variable "count" using "${property}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them.`,
+					);
+				});
+
+				it(`should add suggestions when reading .${property} on a stateful variable with an array init`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}([1]);
+				function read_count() {
+					count.${property};
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to read the stateful variable "count" using "${property}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them.`,
+					);
+				});
+
+				it(`should add suggestions when reading .${property} on a stateful variable with conditional if it's not sure if the property could actually be present on the variable (${init}({}))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}({ value: 0 });
+				function read_count() {
+					count.${property};
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to read the stateful variable "count" using "${property}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them. However I can't verify if "count" is a state variable of an object or a class with a "${property}" property on it. Please verify that before updating the code to use a normal access`,
+					);
+				});
+
+				it(`should add suggestions when reading .${property} on a stateful variable with conditional if it's not sure if the property could actually be present on the variable (${init}(new Class()))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const count = ${init}(new Class());
+				function read_count() {
+					count.${property};
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to read the stateful variable "count" using "${property}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them. However I can't verify if "count" is a state variable of an object or a class with a "${property}" property on it. Please verify that before updating the code to use a normal access`,
+					);
+				});
+
+				it(`should add suggestions when reading .${property} on a stateful variable with conditional if it's not sure if the property could actually be present on the variable (${init}(variable_name))`, () => {
+					const content = run_autofixers_on_code(`
+			<script>
+				const { init } = $props();
+				const count = ${init}(init);
+				function read_count() {
+					count.${property};
+				}
+			</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are trying to read the stateful variable "count" using "${property}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them. However I can't verify if "count" is a state variable of an object or a class with a "${property}" property on it. Please verify that before updating the code to use a normal access`,
+					);
+				});
+			},
+		);
+	});
+
+	describe('imported_runes', () => {
+		describe.each([{ source: 'svelte' }, { source: 'svelte/runes' }])(
+			'from "$source"',
+			({ source }) => {
+				describe.each(dollarless_runes)('single import ($rune)', ({ rune }) => {
+					it(`should add suggestions when importing '${rune}' from '${source}'`, () => {
+						const content = run_autofixers_on_code(`
+					<script>
+						import { ${rune} } from '${source}';
+					</script>`);
+
+						expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+						expect(content.suggestions).toContain(
+							`You are importing "${rune}" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$${rune}" directly.`,
+						);
+					});
+
+					it(`should add suggestions when importing "${rune}" as the default export from '${source}'`, () => {
+						const content = run_autofixers_on_code(`
+					<script>
+						import ${rune} from '${source}';
+					</script>`);
+
+						expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+						expect(content.suggestions).toContain(
+							`You are importing "${rune}" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$${rune}" directly.`,
+						);
+					});
+
+					it(`should add suggestions when importing '${rune}' as the namespace export from '${source}'`, () => {
+						const content = run_autofixers_on_code(`
+					<script>
+						import * as ${rune} from '${source}';
+					</script>`);
+
+						expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+						expect(content.suggestions).toContain(
+							`You are importing "${rune}" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$${rune}" directly.`,
+						);
+					});
+				});
+
+				it(`should add suggestions when importing multiple runes from '${source}'`, () => {
+					const content = run_autofixers_on_code(`
+					<script>
+						import { onMount, state, effect } from '${source}';
+					</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(2);
+					expect(content.suggestions).toContain(
+						`You are importing "state" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$state" directly.`,
+					);
+					expect(content.suggestions).toContain(
+						`You are importing "effect" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$effect" directly.`,
+					);
+				});
+
+				it(`should not add suggestions when importing other identifiers from '${source}'`, () => {
+					const content = run_autofixers_on_code(`
+					<script>
+						import { onMount } from '${source}';
+					</script>`);
+
+					expect(content.suggestions).not.toContain(
+						`You are importing "onMount" from "${source}". This is not necessary, all runes are globally available. Please remove this import and use "$onMount" directly.`,
+					);
+				});
+			},
+		);
+	});
+
+	describe('derived_with_function', () => {
+		it(`should add suggestions when using a function as the first argument to $derived`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				const value = $derived(() => {
+					return 43;
+				});
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				'You are passing a function to $derived when declaring "value" but $derived expects an expression. You can use $derived.by instead.',
+			);
+		});
+
+		it(`should add suggestions when using a function as the first argument to $derived in classes`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				class Double {
+					value = $derived(() => 43);
+				}
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				'You are passing a function to $derived when declaring "value" but $derived expects an expression. You can use $derived.by instead.',
+			);
+		});
+
+		it(`should add suggestions when using a function as the first argument to $derived in classes constructors`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				class Double {
+					value;
+
+					constructor(){
+						this.value = $derived(function() { return 44; });
+					}
+				}
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				'You are passing a function to $derived when declaring "value" but $derived expects an expression. You can use $derived.by instead.',
+			);
+		});
+
+		it(`should add suggestions when using a function as the first argument to $derived without the declaring part if it's not an identifier`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				const { destructured } = $derived(() => 43);
+			</script>`);
+
+			expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+			expect(content.suggestions).toContain(
+				'You are passing a function to $derived but $derived expects an expression. You can use $derived.by instead.',
+			);
+		});
+
+		it(`should add suggestions when using a function as the first argument to $derived.by`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				const { destructured } = $derived.by(() => 43);
+			</script>`);
+
+			expect(content.suggestions).not.toContain(
+				'You are passing a function to $derived but $derived expects an expression. You can use $derived.by instead.',
+			);
+		});
+	});
+
+	describe('use_runes_instead_of_store', () => {
+		describe.each([{ import: 'derived' }, { import: 'writable' }, { import: 'readable' }])(
+			'importing $import from svelte/store',
+			({ import: imported }) => {
+				it(`should add suggestions when importing '${imported}' from 'svelte/store'`, () => {
+					const content = run_autofixers_on_code(`
+				<script>
+					import { ${imported} } from 'svelte/store';
+				</script>`);
+
+					expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+					expect(content.suggestions).toContain(
+						`You are importing "${imported}" from "svelte/store". Unless the user specifically asked for stores or it's required because some library/component requires a store as input consider using runes like \`$state\` or \`$derived\` instead, all runes are globally available.`,
+					);
+				});
+			},
+		);
+
+		it(`should not add suggestions when importing other identifiers from 'svelte/store'`, () => {
+			const content = run_autofixers_on_code(`
+			<script>
+				import { get } from 'svelte/store';
+			</script>`);
+
+			expect(content.suggestions).not.toContain(
+				`You are importing "get" from "svelte/store". Unless the user specifically asked for stores or it's required because some library/component requires a store as input consider using runes like \`$state\` or \`$derived\` instead, all runes are globally available.`,
+			);
+		});
+	});
+
+	describe('suggest_attachments', () => {
+		describe('bind:this', () => {
+			it('should add suggestions when using bind:this on an element', () => {
+				const content = run_autofixers_on_code(`
+			<script>
+				let a = $state();	
+			</script>
+
+			<a bind:this={a} />`);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'The usage of `bind:this` can often be replaced with an easier to read `action` or even better an `attachment`. Consider using the latter if possible.',
+				);
+			});
+
+			it('should not add suggestions when using bind:this on a component', () => {
+				const content = run_autofixers_on_code(`
+			<script>
+				import Child from './Child.svelte';
+				let a = $state();	
+			</script>
+
+			<Child bind:this={a} />`);
+
+				expect(content.suggestions).not.toContain(
+					'The usage of `bind:this` can often be replaced with an easier to read `action` or even better an `attachment`. Consider using the latter if possible.',
+				);
+			});
+
+			it('should not add suggestions when using bind:this on a component nested in an element', () => {
+				const content = run_autofixers_on_code(`
+			<script>
+				import Child from './Child.svelte';
+				let a = $state();	
+			</script>
+
+			<div>
+				<Child bind:this={a} />
+			</div>`);
+
+				expect(content.suggestions).not.toContain(
+					'The usage of `bind:this` can often be replaced with an easier to read `action` or even better an `attachment`. Consider using the latter if possible.',
+				);
+			});
+
+			it('should add suggestions but not suggest attachments when using bind:this on an element and the desired svelte version is 4', () => {
+				const content = run_autofixers_on_code(
+					`
+			<script>
+				let a;	
+			</script>
+
+			<a bind:this={a} />`,
+					4,
+				);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'The usage of `bind:this` can often be replaced with an easier to read `action`. Consider using the latter if possible.',
+				);
+			});
+		});
+
+		describe('use:', () => {
+			it('should add suggestions when using use: on an element and the action is declared as a function', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						function my_action(node) {
+							// do something with the node
+						}
+					</script>
+
+					<a use:my_action />`,
+				);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should add suggestions when using use: on an element and the action is declared as a variable', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						const my_action = (node) => {
+							// do something with the node
+						}
+					</script>
+
+					<a use:my_action />`,
+				);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should add suggestions when using use: on an element and the action is declared as an object', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						const my_action = {
+							action: (node) => {
+								// do something with the node
+							}
+						};
+					</script>
+
+					<a use:my_action.action />`,
+				);
+
+				expect(content.suggestions.length).toBeGreaterThanOrEqual(1);
+				expect(content.suggestions).toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should not add suggestions when using use: on an element and the desired svelte version is 4', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						function my_action(node) {
+							// do something with the node
+						}
+					</script>
+
+					<a use:my_action />`,
+					4,
+				);
+
+				expect(content.suggestions).not.toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should not add suggestions when using use: on an element and the action comes from an import', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						import { my_action } from './actions.js';
+					</script>
+
+					<a use:my_action />`,
+				);
+
+				expect(content.suggestions).not.toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should not add suggestions when using use: on an element and the action comes from the props', () => {
+				const content = run_autofixers_on_code(
+					`<script>
+						const { my_action } = $props();
+					</script>
+
+					<a use:my_action />`,
+				);
+
+				expect(content.suggestions).not.toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+
+			it('should not add suggestions when using use: on an element and the action comes from a global variable', () => {
+				const content = run_autofixers_on_code(`<a use:my_action />`);
+
+				expect(content.suggestions).not.toContain(
+					'Consider using an `attachment` instead of an `action` for "my_action".',
+				);
+			});
+		});
+	});
+});

packages/mcp-server/src/mcp/autofixers/add-autofixers-issues.ts

@@ -1,5 +1,5 @@
 import { parse } from '../../parse/parse.js';
-import { walk } from '../../index.js';
+import { walk } from '../../mcp/autofixers/ast/walk.js';
 import type { Node } from 'estree';
 import * as autofixers from './visitors/index.js';
 

packages/mcp-server/src/mcp/autofixers/add-compile-issues.ts

@@ -0,0 +1,37 @@
+import { compile as compile_component, compileModule } from 'svelte/compiler';
+import { extname } from 'path';
+import ts from 'ts-blank-space';
+
+export function add_compile_issues(
+	content: { issues: string[]; suggestions: string[] },
+	code: string,
+	desired_svelte_version: number,
+	filename = 'Component.svelte',
+) {
+	let compile = compile_component;
+	const extension = extname(filename);
+	if (extension !== '.svelte') {
+		compile = compileModule;
+		// compile module doesn't accept .ts files so we need to transpile them first with ts-blank-space
+		// a fast and lightweight typescript transpiler that can strips types replacing them with white spaces
+		// so the code positions are not affected
+		if (extension === '.ts') {
+			code = ts(code, (node) => {
+				content.issues.push(
+					`The provided file is a module but it contains invalid TypeScript code: ${node.getText()} at ${node.getStart()}`,
+				);
+			});
+		}
+	}
+	const compilation_result = compile(code, {
+		filename: filename || 'Component.svelte',
+		generate: false,
+		runes: desired_svelte_version >= 5,
+	});
+
+	for (const warning of compilation_result.warnings) {
+		content.issues.push(
+			`${warning.message} at line ${warning.start?.line}, column ${warning.start?.column}`,
+		);
+	}
+}

packages/mcp-server/src/mcp/autofixers/add-eslint-issues.ts

@@ -2,6 +2,7 @@ import { ESLint } from 'eslint';
 import svelte_parser from 'svelte-eslint-parser';
 import svelte from 'eslint-plugin-svelte';
 import type { Config } from '@sveltejs/kit';
+import ts from 'typescript-eslint';
 
 let svelte_5_linter: ESLint | undefined;
 
@@ -11,7 +12,7 @@ function base_config(svelte_config: Config): ESLint.Options['baseConfig'] {
 	return [
 		...svelte.configs.recommended,
 		{
-			files: ['*.svelte'],
+			files: ['*.svelte', '*.svelte.ts', '*.svelte.js'],
 			rules: {
 				'no-self-assign': 'warn',
 				'svelte/infinite-reactive-loop': 'warn',
@@ -41,6 +42,8 @@ function base_config(svelte_config: Config): ESLint.Options['baseConfig'] {
 				sourceType: 'module',
 				parser: svelte_parser,
 				parserOptions: {
+					extraFileExtensions: ['.svelte'],
+					parser: ts.parser,
 					svelteConfig: svelte_config,
 				},
 			},
@@ -78,7 +81,7 @@ export async function add_eslint_issues(
 	const eslint = get_linter(desired_svelte_version);
 	const results = await eslint.lintText(code, { filePath: filename || './Component.svelte' });
 
-	for (const message of results[0].messages) {
+	for (const message of results[0]?.messages ?? []) {
 		if (message.severity === 2) {
 			content.issues.push(`${message.message} at line ${message.line}, column ${message.column}`);
 		} else if (message.severity === 1) {

packages/mcp-server/src/mcp/autofixers/visitors/assign-in-effect.ts

@@ -0,0 +1,80 @@
+import type {
+	AssignmentExpression,
+	CallExpression,
+	Identifier,
+	Node,
+	UpdateExpression,
+} from 'estree';
+import type { Autofixer, AutofixerState } from './index.js';
+import { left_most_id } from '../ast/utils.js';
+import type { AST } from 'svelte-eslint-parser';
+import type { Context } from 'zimmerframe';
+
+function run_if_in_effect(
+	path: (Node | AST.SvelteNode)[],
+	state: AutofixerState,
+	to_run: () => void,
+) {
+	const in_effect = path.findLast(
+		(node) =>
+			node.type === 'CallExpression' && state.parsed.is_rune(node, ['$effect', '$effect.pre']),
+	);
+
+	if (in_effect) {
+		to_run();
+	}
+}
+
+function assign_or_update_visitor(
+	node: UpdateExpression | AssignmentExpression,
+	{ state, path, next }: Context<Node | AST.SvelteNode, AutofixerState>,
+) {
+	run_if_in_effect(path, state, () => {
+		function check_if_stateful_id(id: Identifier) {
+			const reference = state.parsed.find_reference_by_id(id);
+			const definition = reference?.resolved?.defs[0];
+			if (definition && definition.type === 'Variable') {
+				const init = definition.node.init;
+				if (
+					init?.type === 'CallExpression' &&
+					state.parsed.is_rune(init, ['$state', '$state.raw', '$derived', '$derived.by'])
+				) {
+					state.output.suggestions.push(
+						`The stateful variable "${id.name}" is assigned inside an $effect which is generally consider a malpractice. Consider using $derived if possible.`,
+					);
+				}
+			}
+		}
+		const variable = node.type === 'UpdateExpression' ? node.argument : node.left;
+
+		if (variable.type === 'Identifier') {
+			check_if_stateful_id(variable);
+		} else if (variable.type === 'MemberExpression') {
+			const object = left_most_id(variable);
+			if (object) {
+				check_if_stateful_id(object);
+			}
+		}
+	});
+	next();
+}
+
+function call_expression_visitor(
+	node: CallExpression,
+	{ state, path, next }: Context<Node | AST.SvelteNode, AutofixerState>,
+) {
+	run_if_in_effect(path, state, () => {
+		const function_name =
+			node.callee.type === 'Identifier' ? `the function \`${node.callee.name}\`` : 'a function';
+		state.output.suggestions.push(
+			`You are calling ${function_name} inside an $effect. Please check if the function is reassigning a stateful variable because that's considered malpractice and check if it could use  \`$derived\` instead. Ignore this suggestion if you are sure this function is not assigning any stateful variable or if you can't check if it does.`,
+		);
+	});
+	next();
+}
+
+export const assign_in_effect: Autofixer = {
+	UpdateExpression: assign_or_update_visitor,
+	AssignmentExpression: assign_or_update_visitor,
+	CallExpression: call_expression_visitor,
+};

packages/mcp-server/src/mcp/autofixers/visitors/derived-with-function.ts

@@ -1,5 +1,5 @@
 import type { Identifier, PrivateIdentifier } from 'estree';
-import type { Autofixer } from '.';
+import type { Autofixer } from './index.js';
 
 export const derived_with_function: Autofixer = {
 	CallExpression(node, { state, path }) {
@@ -7,15 +7,15 @@ export const derived_with_function: Autofixer = {
 			node.callee.type === 'Identifier' &&
 			node.callee.name === '$derived' &&
 			state.parsed.is_rune(node, ['$derived']) &&
-			(node.arguments[0].type === 'ArrowFunctionExpression' ||
-				node.arguments[0].type === 'FunctionExpression')
+			(node.arguments[0]?.type === 'ArrowFunctionExpression' ||
+				node.arguments[0]?.type === 'FunctionExpression')
 		) {
 			const parent = path[path.length - 1];
 			let variable_id: Identifier | PrivateIdentifier | undefined;
-			if (parent.type === 'VariableDeclarator' && parent.id.type === 'Identifier') {
+			if (parent?.type === 'VariableDeclarator' && parent.id.type === 'Identifier') {
 				// const something = $derived(...)
 				variable_id = parent.id;
-			} else if (parent.type === 'PropertyDefinition') {
+			} else if (parent?.type === 'PropertyDefinition') {
 				// class X { something = $derived(...) }
 				variable_id =
 					parent.key.type === 'Identifier'
@@ -23,7 +23,7 @@ export const derived_with_function: Autofixer = {
 						: parent.key.type === 'PrivateIdentifier'
 							? parent.key
 							: undefined;
-			} else if (parent.type === 'AssignmentExpression') {
+			} else if (parent?.type === 'AssignmentExpression') {
 				// this.something = $derived(...)
 				variable_id =
 					parent.left.type === 'MemberExpression'

packages/mcp-server/src/mcp/autofixers/visitors/imported-runes.ts

@@ -1,5 +1,5 @@
 import { base_runes } from '../../../constants.js';
-import type { Autofixer } from '.';
+import type { Autofixer } from './index.js';
 
 const dollarless_runes = base_runes.map((r) => r.replace('$', ''));
 

packages/mcp-server/src/mcp/autofixers/visitors/index.ts

@@ -12,6 +12,8 @@ export type AutofixerState = {
 export type Autofixer = Visitors<Node | AST.SvelteNode, AutofixerState>;
 
 export * from './assign-in-effect.js';
-export * from './set-or-update-state.js';
+export * from './wrong-property-access-state.js';
 export * from './imported-runes.js';
 export * from './derived-with-function.js';
+export * from './use-runes-instead-of-store.js';
+export * from './suggest-attachments.js';

packages/mcp-server/src/mcp/autofixers/visitors/suggest-attachments.ts

@@ -0,0 +1,47 @@
+import type { Identifier } from 'estree';
+import type { Autofixer } from './index.js';
+import { left_most_id } from '../ast/utils.js';
+
+export const suggest_attachments: Autofixer = {
+	SvelteDirective(node, { state, next, path }) {
+		if (node.kind === 'Binding' && node.key.name.name === 'this') {
+			const parent_element = path.findLast((p) => p.type === 'SvelteElement');
+			if (parent_element?.kind === 'html' && parent_element.startTag.attributes.includes(node)) {
+				let better_an_attachment = ` or even better an \`attachment\``;
+				if (state.desired_svelte_version === 4) {
+					better_an_attachment = ``;
+				}
+				state.output.suggestions.push(
+					`The usage of \`bind:this\` can often be replaced with an easier to read \`action\`${better_an_attachment}. Consider using the latter if possible.`,
+				);
+			}
+		} else if (node.kind === 'Action' && state.desired_svelte_version === 5) {
+			let id: Identifier | null = null;
+			if (node.key.name.type === 'Identifier') {
+				id = node.key.name;
+			} else if (node.key.name.type === 'MemberExpression') {
+				id = left_most_id(node.key.name);
+			}
+			if (id) {
+				const reference = state.parsed.find_reference_by_id(id);
+				const definition = reference?.resolved?.defs[0];
+				console.log(definition);
+				if (
+					definition &&
+					(definition.type === 'Variable' ||
+						!(definition.type === 'ImportBinding' || definition.type === 'Parameter')) &&
+					!(
+						definition.type === 'Variable' &&
+						definition.node.init?.type === 'CallExpression' &&
+						state.parsed.is_rune(definition.node.init, ['$props'])
+					)
+				) {
+					state.output.suggestions.push(
+						`Consider using an \`attachment\` instead of an \`action\` for "${id.name}".`,
+					);
+				}
+			}
+		}
+		next();
+	},
+};

packages/mcp-server/src/mcp/autofixers/visitors/use-runes-instead-of-store.ts

@@ -0,0 +1,21 @@
+import type { Autofixer } from './index.js';
+
+export const use_runes_instead_of_store: Autofixer = {
+	ImportDeclaration(node, { state, next }) {
+		const source = (node.source.value || node.source.raw?.slice(1, -1))?.toString();
+		if (source && source === 'svelte/store') {
+			for (const specifier of node.specifiers) {
+				if (
+					specifier.type === 'ImportSpecifier' &&
+					specifier.imported.type === 'Identifier' &&
+					['derived', 'writable', 'readable'].includes(specifier.imported.name)
+				) {
+					state.output.suggestions.push(
+						`You are importing "${specifier.imported.name}" from "svelte/store". Unless the user specifically asked for stores or it's required because some library/component requires a store as input consider using runes like \`$state\` or \`$derived\` instead, all runes are globally available.`,
+					);
+				}
+			}
+		}
+		next();
+	},
+};

packages/mcp-server/src/mcp/autofixers/visitors/wrong-property-access-state.ts

@@ -0,0 +1,41 @@
+import type { Autofixer } from './index.js';
+import { left_most_id } from '../ast/utils.js';
+
+const UPDATE_PROPERTIES = new Set(['set', 'update', '$']);
+const METHODS = new Set(['set', 'update']);
+
+export const wrong_property_access_state: Autofixer = {
+	MemberExpression(node, { state, next, path }) {
+		const parent = path[path.length - 1];
+		let is_property = false;
+		if (
+			node.property.type === 'Identifier' &&
+			((is_property = !METHODS.has(node.property.name)) ||
+				(parent?.type === 'CallExpression' && parent.callee === node)) &&
+			UPDATE_PROPERTIES.has(node.property.name)
+		) {
+			const id = left_most_id(node);
+			if (id) {
+				const reference = state.parsed.find_reference_by_id(id);
+				const definition = reference?.resolved?.defs[0];
+				if (definition && definition.type === 'Variable') {
+					const init = definition.node.init;
+					if (
+						init?.type === 'CallExpression' &&
+						state.parsed.is_rune(init, ['$state', '$state.raw', '$derived', '$derived.by'])
+					) {
+						let suggestion = is_property
+							? `You are trying to read the stateful variable "${id.name}" using "${node.property.name}". stateful variables should be read just by accessing them like normal variable, do not use properties to read them.`
+							: `You are trying to update the stateful variable "${id.name}" using "${node.property.name}". stateful variables should be updated with a normal assignment/mutation, do not use methods to update them.`;
+						const argument = init.arguments[0];
+						if (!argument || (argument.type !== 'Literal' && argument.type !== 'ArrayExpression')) {
+							suggestion += ` However I can't verify if "${id.name}" is a state variable of an object or a class with a "${node.property.name}" ${is_property ? 'property' : 'method'} on it. Please verify that before updating the code to use a normal ${is_property ? 'access' : 'assignment'}`;
+						}
+						state.output.suggestions.push(suggestion);
+					}
+				}
+			}
+		}
+		next();
+	},
+};

packages/mcp-server/src/mcp/handlers/index.ts

@@ -0,0 +1,22 @@
+import type { SvelteMcp } from '../index.js';
+import * as prompts from './prompts/index.js';
+import * as tools from './tools/index.js';
+import * as resources from './resources/index.js';
+
+export function setup_tools(server: SvelteMcp) {
+	for (const tool in tools) {
+		tools[tool as keyof typeof tools](server);
+	}
+}
+
+export function setup_prompts(server: SvelteMcp) {
+	for (const prompt in prompts) {
+		prompts[prompt as keyof typeof prompts](server);
+	}
+}
+
+export function setup_resources(server: SvelteMcp) {
+	for (const resource in resources) {
+		resources[resource as keyof typeof resources](server);
+	}
+}

packages/mcp-server/src/mcp/handlers/prompts/index.ts

@@ -0,0 +1 @@
+export * from './svelte-task.js';

packages/mcp-server/src/mcp/handlers/prompts/svelte-task.ts

@@ -0,0 +1,46 @@
+import type { SvelteMcp } from '../../index.js';
+import * as v from 'valibot';
+import { format_sections_list } from '../../utils.js';
+
+export function setup_svelte_task(server: SvelteMcp) {
+	server.prompt(
+		{
+			name: 'svelte-task-prompt',
+			title: 'Svelte-Task-Prompt',
+			description:
+				'Use this Prompt to ask for any svelte related task. It will automatically instruct the LLM on how to best use the autofixer and how to query for documentation pages.',
+			schema: v.object({
+				task: v.pipe(v.string(), v.description('The task to be performed')),
+			}),
+		},
+		async ({ task }) => {
+			const available_docs = await format_sections_list();
+
+			return {
+				messages: [
+					{
+						role: 'user',
+						content: {
+							type: 'text',
+							text: `You are a Svelte expert tasked to build components and utilities for Svelte developers. If you need documentation for anything related to Svelte you can invoke the tool \`get_documentation\` with one of the following paths:
+<available-docs>
+${available_docs}
+</available-docs>
+
+Every time you write a Svelte component or a Svelte module you MUST invoke the \`svelte-autofixer\` tool providing the code. The tool will return a list of issues or suggestions. If there are any issues or suggestions you MUST fix them and call the tool again with the updated code. You MUST keep doing this until the tool returns no issues or suggestions. Only then you can return the code to the user.
+
+This is the task you will work on:
+
+<task>
+${task}
+</task>
+
+If you are not writing the code into a file, once you have the final version of the code ask the user if it wants to generate a playground link to quickly check the code in it and if it answer yes call the \`playground-link\` tool and return the url to the user nicely formatted. The playground link MUST be generated only once you have the final version of the code and you are ready to share it, it MUST include an entry point file called \`App.svelte\` where the main component should live. If you have multiple files to include in the playground link you can include them all at the root.
+`,
+						},
+					},
+				],
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/handlers/resources/doc-section.ts

@@ -0,0 +1,64 @@
+import type { SvelteMcp } from '../../index.js';
+import { get_sections, fetch_with_timeout } from '../../utils.js';
+
+export async function list_sections(server: SvelteMcp) {
+	const sections = await get_sections();
+
+	server.template(
+		{
+			name: 'Svelte-Doc-Section',
+			description: 'A single documentation section',
+			list() {
+				return sections.map((section) => {
+					const section_name = section.slug;
+					const resource_name = section_name;
+					const resource_uri = `svelte://${section_name}.md`;
+					return {
+						name: resource_name,
+						description: section.use_cases,
+						uri: resource_uri,
+						title: section.title,
+					};
+				});
+			},
+			complete: {
+				slug: (query) => {
+					const values = sections
+						.reduce<string[]>((acc, section) => {
+							const section_name = section.slug;
+							const resource_name = section_name;
+							if (section_name.includes(query.toLowerCase())) {
+								acc.push(resource_name);
+							}
+							return acc;
+						}, [])
+						// there's a hard limit of 100 for completions
+						.slice(0, 100);
+					return {
+						completion: {
+							values,
+						},
+					};
+				},
+			},
+			uri: 'svelte://{/slug*}.md',
+		},
+		async (uri, { slug }) => {
+			const section = sections.find((section) => {
+				return slug === section.slug;
+			});
+			if (!section) throw new Error(`Section not found: ${slug}`);
+			const response = await fetch_with_timeout(section.url);
+			const content = await response.text();
+			return {
+				contents: [
+					{
+						uri,
+						type: 'text',
+						text: content,
+					},
+				],
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/handlers/resources/index.ts

@@ -0,0 +1 @@
+export * from './doc-section.js';

packages/mcp-server/src/mcp/handlers/tools/get-documentation.ts

@@ -0,0 +1,115 @@
+import type { SvelteMcp } from '../../index.js';
+import * as v from 'valibot';
+import { get_sections, fetch_with_timeout, format_sections_list } from '../../utils.js';
+import { SECTIONS_LIST_INTRO, SECTIONS_LIST_OUTRO } from './prompts.js';
+
+export function get_documentation(server: SvelteMcp) {
+	server.tool(
+		{
+			name: 'get-documentation',
+			description:
+				'Retrieves full documentation content for Svelte 5 or SvelteKit sections. Supports flexible search by title (e.g., "$state", "routing") or file path (e.g., "cli/overview"). Can accept a single section name or an array of sections. Before running this, make sure to analyze the users query, as well as the output from list-sections (which should be called first). Then ask for ALL relevant sections the user might require. For example, if the user asks to build anything interactive, you will need to fetch all relevant runes, and so on.',
+			schema: v.object({
+				section: v.pipe(
+					v.union([v.string(), v.array(v.string())]),
+					v.description(
+						'The section name(s) to retrieve. Can search by title (e.g., "$state", "load functions") or file path (e.g., "cli/overview"). Supports single string and array of strings',
+					),
+				),
+			}),
+		},
+		async ({ section }) => {
+			let sections: string[];
+
+			if (Array.isArray(section)) {
+				sections = section.filter((s): s is string => typeof s === 'string');
+			} else if (
+				typeof section === 'string' &&
+				section.trim().startsWith('[') &&
+				section.trim().endsWith(']')
+			) {
+				try {
+					const parsed = JSON.parse(section);
+					if (Array.isArray(parsed)) {
+						sections = parsed.filter((s): s is string => typeof s === 'string');
+					} else {
+						sections = [section];
+					}
+				} catch {
+					sections = [section];
+				}
+			} else if (typeof section === 'string') {
+				sections = [section];
+			} else {
+				sections = [];
+			}
+
+			const available_sections = await get_sections();
+
+			const settled_results = await Promise.allSettled(
+				sections.map(async (requested_section) => {
+					const matched_section = available_sections.find(
+						(s) =>
+							s.title.toLowerCase() === requested_section.toLowerCase() ||
+							s.slug === requested_section ||
+							s.url === requested_section,
+					);
+
+					if (matched_section) {
+						try {
+							const response = await fetch_with_timeout(matched_section.url);
+							if (response.ok) {
+								const content = await response.text();
+								return { success: true, content: `## ${matched_section.title}\n\n${content}` };
+							} else {
+								return {
+									success: false,
+									content: `## ${matched_section.title}\n\nError: Could not fetch documentation (HTTP ${response.status})`,
+								};
+							}
+						} catch (error) {
+							return {
+								success: false,
+								content: `## ${matched_section.title}\n\nError: Failed to fetch documentation - ${error}`,
+							};
+						}
+					} else {
+						return {
+							success: false,
+							content: `## ${requested_section}\n\nError: Section not found.`,
+						};
+					}
+				}),
+			);
+
+			const results = settled_results.map((result) => {
+				if (result.status === 'fulfilled') {
+					return result.value;
+				} else {
+					return {
+						success: false,
+						content: `Error: Couldn't fetch - ${result.reason}`,
+					};
+				}
+			});
+
+			const has_any_success = results.some((result) => result.success);
+			let final_text = results.map((r) => r.content).join('\n\n---\n\n');
+
+			if (!has_any_success) {
+				const formatted_sections = await format_sections_list();
+
+				final_text += `\n\n---\n\n${SECTIONS_LIST_INTRO}\n\n${formatted_sections}\n\n${SECTIONS_LIST_OUTRO}`;
+			}
+
+			return {
+				content: [
+					{
+						type: 'text',
+						text: final_text,
+					},
+				],
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/handlers/tools/index.ts

@@ -0,0 +1,4 @@
+export * from './get-documentation.js';
+export * from './list-sections.js';
+export * from './svelte-autofixer.js';
+export * from './playground-link.js';

packages/mcp-server/src/mcp/handlers/tools/list-sections.ts

@@ -0,0 +1,25 @@
+import type { SvelteMcp } from '../../index.js';
+import { format_sections_list } from '../../utils.js';
+import { SECTIONS_LIST_INTRO, SECTIONS_LIST_OUTRO } from './prompts.js';
+
+export function list_sections(server: SvelteMcp) {
+	server.tool(
+		{
+			name: 'list-sections',
+			description:
+				'Lists all available Svelte 5 and SvelteKit documentation sections in a structured format. Each section includes a "use_cases" field that describes WHEN this documentation would be useful. You should carefully analyze the use_cases field to determine which sections are relevant for the user\'s query. The use_cases contain comma-separated keywords describing project types (e.g., "e-commerce", "blog"), features (e.g., "authentication", "forms"), components (e.g., "slider", "modal"), development stages (e.g., "deployment", "testing"), or "always" for fundamental concepts. Match these use_cases against the user\'s intent - for example, if building an e-commerce site, fetch sections with use_cases containing "e-commerce", "product listings", "shopping cart", etc. If building a slider, look for "slider", "carousel", "animation", etc. Returns sections as "* title: [section_title], use_cases: [use_cases], path: [file_path]". Always run list-sections FIRST for any Svelte query, then analyze ALL use_cases to identify relevant sections, and finally use get_documentation to fetch ALL relevant sections at once.',
+		},
+		async () => {
+			const formatted_sections = await format_sections_list();
+
+			return {
+				content: [
+					{
+						type: 'text',
+						text: `${SECTIONS_LIST_INTRO}\n\n${formatted_sections}\n\n${SECTIONS_LIST_OUTRO}`,
+					},
+				],
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/handlers/tools/playground-link.ts

@@ -0,0 +1,112 @@
+import type { SvelteMcp } from '../../index.js';
+import * as v from 'valibot';
+
+async function compress_and_encode_text(input: string) {
+	const reader = new Blob([input]).stream().pipeThrough(new CompressionStream('gzip')).getReader();
+	let buffer = '';
+	for (;;) {
+		const { done, value } = await reader.read();
+		if (done) {
+			reader.releaseLock();
+			// Some sites like discord don't like it when links end with =
+			return btoa(buffer).replaceAll('+', '-').replaceAll('/', '_').replace(/=+$/, '');
+		} else {
+			for (let i = 0; i < value.length; i++) {
+				// decoding as utf-8 will make btoa reject the string
+				buffer += String.fromCharCode(value[i]!);
+			}
+		}
+	}
+}
+
+type File = {
+	type: 'file';
+	name: string;
+	basename: string;
+	contents: string;
+	text: boolean;
+};
+
+export function playground_link(server: SvelteMcp) {
+	server.tool(
+		{
+			name: 'playground-link',
+			description:
+				'Generates a Playground link given a Svelte code snippet. Once you have the final version of the code you want to send to the user, ALWAYS ask the user if it wants a playground link to allow it to quickly check the code in the playground before calling this tool. NEVER use this tool if you have written the component to a file in the user project. The playground accept multiple files so if are importing from other files just include them all at the root level.',
+			schema: v.object({
+				name: v.pipe(
+					v.string(),
+					v.description('The name of the Playground, it should reflect the user task'),
+				),
+				tailwind: v.pipe(
+					v.boolean(),
+					v.description(
+						"If the code requires Tailwind CSS to work...only send true if it it's using tailwind classes in the code",
+					),
+				),
+				files: v.pipe(
+					v.record(v.string(), v.string()),
+					v.description(
+						"An object where all the keys are the filenames (with extensions) and the values are the file content. For example: { 'Component.svelte': '<script>...</script>', 'utils.js': 'export function ...' }. The playground accept multiple files so if are importing from other files just include them all at the root level.",
+					),
+				),
+			}),
+			outputSchema: v.object({
+				url: v.string(),
+			}),
+		},
+		async ({ files, name, tailwind }) => {
+			const playground_base = new URL('https://svelte.dev/playground');
+			const playground_files: File[] = [];
+
+			let has_app_svelte = false;
+
+			for (const [filename, contents] of Object.entries(files)) {
+				if (filename === 'App.svelte') has_app_svelte = true;
+				playground_files.push({
+					type: 'file',
+					name: filename,
+					basename: filename.replace(/^.*[\\/]/, ''),
+					contents,
+					text: true,
+				});
+			}
+
+			if (!has_app_svelte) {
+				return {
+					isError: true,
+					content: [
+						{
+							type: 'text',
+							text: JSON.stringify({
+								error: 'The files must contain an App.svelte file as the entry point',
+							}),
+						},
+					],
+				};
+			}
+
+			const playground_config = {
+				name,
+				tailwind: tailwind ?? false,
+				files: playground_files,
+			};
+
+			playground_base.hash = await compress_and_encode_text(JSON.stringify(playground_config));
+
+			const content = {
+				url: playground_base.toString(),
+			};
+
+			return {
+				content: [
+					{
+						type: 'text',
+						text: JSON.stringify(content),
+					},
+				],
+				structuredContent: content,
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/handlers/tools/prompts.ts

@@ -0,0 +1,5 @@
+export const SECTIONS_LIST_INTRO =
+	'List of available Svelte documentation sections with their intended use cases. The "use_cases" field describes WHEN each section would be useful - analyze these carefully to determine which sections match the user\'s query:';
+
+export const SECTIONS_LIST_OUTRO =
+	"Carefully analyze the use_cases field for each section to identify which documentation is relevant for the user's specific query. The use_cases contain keywords for project types, features, components, and development stages. After identifying relevant sections, use the get-documentation tool with ALL relevant section titles or paths at once (can pass multiple sections as an array).";

packages/mcp-server/src/mcp/handlers/tools/svelte-autofixer.ts

@@ -0,0 +1,86 @@
+import { basename } from 'node:path';
+import type { SvelteMcp } from '../../index.js';
+import * as v from 'valibot';
+import { add_compile_issues } from '../../autofixers/add-compile-issues.js';
+import { add_eslint_issues } from '../../autofixers/add-eslint-issues.js';
+import { add_autofixers_issues } from '../../autofixers/add-autofixers-issues.js';
+
+export function svelte_autofixer(server: SvelteMcp) {
+	server.tool(
+		{
+			name: 'svelte-autofixer',
+			title: 'Svelte Autofixer',
+			description:
+				'Given a svelte component or module returns a list of suggestions to fix any issues it has. This tool MUST be used whenever the user is asking to write svelte code before sending the code back to the user',
+			schema: v.object({
+				code: v.string(),
+				desired_svelte_version: v.pipe(
+					v.union([v.literal(4), v.literal(5), v.literal('4'), v.literal('5')]),
+					v.description(
+						'The desired svelte version...if possible read this from the package.json of the user project, otherwise use some hint from the wording (if the user asks for runes it wants version 5). Default to 5 in case of doubt.',
+					),
+				),
+				filename: v.pipe(
+					v.optional(v.string()),
+					v.description(
+						'The filename of the component if available, it MUST be only the Component name with .svelte or .svelte.ts extension and not the entire path.',
+					),
+				),
+			}),
+			outputSchema: v.object({
+				issues: v.array(v.string()),
+				suggestions: v.array(v.string()),
+				require_another_tool_call_after_fixing: v.boolean(),
+			}),
+			annotations: {
+				title: 'Svelte Autofixer',
+				destructiveHint: false,
+				readOnlyHint: true,
+				openWorldHint: false,
+			},
+		},
+		async ({ code, filename: filename_or_path, desired_svelte_version }) => {
+			const content: {
+				issues: string[];
+				suggestions: string[];
+				require_another_tool_call_after_fixing: boolean;
+			} = { issues: [], suggestions: [], require_another_tool_call_after_fixing: false };
+			try {
+				// just in case the LLM sends a full path we extract the filename...it's not really needed
+				// but it's nice to have a filename in the errors
+
+				const filename = filename_or_path ? basename(filename_or_path) : 'Component.svelte';
+
+				add_compile_issues(content, code, +desired_svelte_version, filename);
+
+				add_autofixers_issues(content, code, +desired_svelte_version, filename);
+
+				await add_eslint_issues(content, code, +desired_svelte_version, filename);
+			} catch (e: unknown) {
+				const error = e as Error & { start?: { line: number; column: number } };
+				content.issues.push(
+					`${error.message} at line ${error.start?.line}, column ${error.start?.column}`,
+				);
+				if (error.message.includes('js_parse_error')) {
+					content.suggestions.push(
+						"The code can't be compiled because a Javascript parse error. In case you are using runes like this `$state variable_name = 3;` or `$derived variable_name = 3 * count` that's not how runes are used. You need to use them as function calls without importing them: `const variable_name = $state(3)` and `const variable_name = $derived(3 * count)`.",
+					);
+				}
+			}
+
+			if (content.issues.length > 0 || content.suggestions.length > 0) {
+				content.require_another_tool_call_after_fixing = true;
+			}
+
+			return {
+				content: [
+					{
+						type: 'text',
+						text: JSON.stringify(content),
+					},
+				],
+				structuredContent: content,
+			};
+		},
+	);
+}

packages/mcp-server/src/mcp/index.ts

@@ -0,0 +1,30 @@
+import { ValibotJsonSchemaAdapter } from '@tmcp/adapter-valibot';
+import { McpServer } from 'tmcp';
+import { setup_prompts, setup_resources, setup_tools } from './handlers/index.js';
+import type { LibSQLDatabase } from 'drizzle-orm/libsql';
+import type { Schema } from '@sveltejs/mcp-schema';
+
+export const server = new McpServer(
+	{
+		name: 'Svelte MCP',
+		version: '0.0.1',
+		description: 'The official Svelte MCP server implementation',
+	},
+	{
+		adapter: new ValibotJsonSchemaAdapter(),
+		capabilities: {
+			tools: {},
+			prompts: {},
+			resources: {},
+			completions: {},
+		},
+		instructions:
+			'This is the official Svelte MCP server. It MUST be used whenever svelte development is involved. It can provide official documentation, code examples and correct your code. After you correct the component call this tool again to confirm all the issues are fixed.',
+	},
+).withContext<{ db: LibSQLDatabase<Schema> }>();
+
+export type SvelteMcp = typeof server;
+
+setup_tools(server);
+setup_resources(server);
+setup_prompts(server);

packages/mcp-server/src/mcp/utils.ts

@@ -0,0 +1,56 @@
+import * as v from 'valibot';
+import { documentation_sections_schema } from '../lib/schemas.js';
+import summary_data from '../use_cases.json' with { type: 'json' };
+
+export async function fetch_with_timeout(
+	url: string,
+	timeout_ms: number = 10000,
+): Promise<Response> {
+	try {
+		const response = await fetch(url, { signal: AbortSignal.timeout(timeout_ms) });
+		return response;
+	} catch (error) {
+		if (error instanceof Error && error.name === 'AbortError') {
+			throw new Error(`Request timed out after ${timeout_ms}ms`);
+		}
+		throw error;
+	}
+}
+
+const summaries = (summary_data.summaries || {}) as Record<string, string>;
+
+export async function get_sections() {
+	const sections = await fetch_with_timeout(
+		'https://svelte.dev/docs/experimental/sections.json',
+	).then((res) => res.json());
+	const validated_sections = v.safeParse(documentation_sections_schema, sections);
+	if (!validated_sections.success) return [];
+
+	const mapped_sections = Object.entries(validated_sections.output).map(([, section]) => {
+		const original_slug = section.slug;
+		const cleaned_slug = original_slug.startsWith('docs/')
+			? original_slug.slice('docs/'.length)
+			: original_slug;
+
+		return {
+			title: section.metadata.title,
+			use_cases:
+				section.metadata.use_cases ??
+				summaries[original_slug] ??
+				summaries[cleaned_slug] ??
+				'use title and path to estimate use case',
+			slug: cleaned_slug,
+			// Use original slug in URL to ensure it still works
+			url: `https://svelte.dev/${original_slug}/llms.txt`,
+		};
+	});
+
+	return mapped_sections;
+}
+
+export async function format_sections_list() {
+	const sections = await get_sections();
+	return sections
+		.map((s) => `* title: ${s.title}, use_cases: ${s.use_cases}, path: ${s.slug}`)
+		.join('\n');
+}

packages/mcp-server/src/parse/parse.spec.ts

@@ -1,6 +1,6 @@
 import type { TSESTree } from '@typescript-eslint/types';
 import { describe, expect, it } from 'vitest';
-import { walk } from '$lib/index.js';
+import { walk } from '../mcp/autofixers/ast/walk.js';
 import { parse, type ParseResult } from './parse.js';
 
 // ----------------------------------------------------------------------
@@ -57,8 +57,8 @@ function assert_svelte_file(result: ParseResult) {
 	const name_var = variable_declaration_from_id(result, declaration_id);
 	expect(Array.isArray(name_var.defs)).toBe(true);
 	expect(name_var.defs.length).toBeGreaterThan(0);
-	expect(name_var.defs[0].type).toBe('Variable');
-	expect(name_var.defs[0].name && name_var.defs[0].name.name).toBe('name');
+	expect(name_var.defs[0]?.type).toBe('Variable');
+	expect(name_var.defs[0]?.name && name_var.defs[0].name.name).toBe('name');
 
 	const references_to_name = all_references.filter((rf) => rf.resolved === name_var);
 	expect(references_to_name.length).toBeGreaterThan(0);
@@ -76,7 +76,7 @@ function assert_sveltejs_file(result: ParseResult) {
 	const v_var = variable_declaration_from_id(result, declaration_id);
 	expect(Array.isArray(v_var.defs)).toBe(true);
 	expect(v_var.defs.length).toBeGreaterThan(0);
-	expect(v_var.defs[0].type).toBeTruthy();
+	expect(v_var.defs[0]?.type).toBeTruthy();
 
 	const references_to_v = all_references.filter((rf) => rf.resolved === v_var);
 	expect(references_to_v.length).toBeGreaterThanOrEqual(2);

packages/mcp-server/src/use_cases.json

@@ -0,0 +1,176 @@
+{
+	"generated_at": "2025-10-02T20:29:23.410Z",
+	"model": "claude-sonnet-4-5-20250929",
+	"total_sections": 167,
+	"successful_summaries": 167,
+	"failed_summaries": 0,
+	"summaries": {
+		"docs/cli/overview": "project setup, creating new svelte apps, scaffolding, cli tools, initializing projects",
+		"docs/cli/faq": "project setup, initializing new svelte projects, troubleshooting cli installation, package manager configuration",
+		"docs/cli/sv-create": "project setup, starting new sveltekit app, initializing project, creating from playground, choosing project template",
+		"docs/cli/sv-add": "project setup, adding features to existing projects, integrating tools, testing setup, styling setup, authentication, database setup, deployment adapters",
+		"docs/cli/sv-check": "code quality, ci/cd pipelines, error checking, typescript projects, pre-commit hooks, finding unused css, accessibility auditing, production builds",
+		"docs/cli/sv-migrate": "migration, upgrading svelte versions, upgrading sveltekit versions, modernizing codebase, svelte 3 to 4, svelte 4 to 5, sveltekit 1 to 2, adopting runes, refactoring deprecated apis",
+		"docs/cli/devtools-json": "development setup, chrome devtools integration, browser-based editing, local development workflow, debugging setup",
+		"docs/cli/drizzle": "database setup, sql queries, orm integration, data modeling, postgresql, mysql, sqlite, server-side data access, database migrations, type-safe queries",
+		"docs/cli/eslint": "code quality, linting, error detection, project setup, code standards, team collaboration, typescript projects",
+		"docs/cli/lucia": "authentication, login systems, user management, registration pages, session handling, auth setup",
+		"docs/cli/mdsvex": "blog, content sites, markdown rendering, documentation sites, technical writing, cms integration, article pages",
+		"docs/cli/paraglide": "internationalization, multi-language sites, i18n, translation, localization, language switching, global apps, multilingual content",
+		"docs/cli/playwright": "browser testing, e2e testing, integration testing, test automation, quality assurance, ci/cd pipelines, testing user flows",
+		"docs/cli/prettier": "code formatting, project setup, code style consistency, team collaboration, linting configuration",
+		"docs/cli/storybook": "component development, design systems, ui library, isolated component testing, documentation, visual testing, component showcase",
+		"docs/cli/sveltekit-adapter": "deployment, production builds, hosting setup, choosing deployment platform, configuring adapters, static site generation, node server, vercel, cloudflare, netlify",
+		"docs/cli/tailwind": "project setup, styling, css framework, rapid prototyping, utility-first css, design systems, responsive design, adding tailwind to svelte",
+		"docs/cli/vitest": "testing, unit tests, component testing, test setup, quality assurance, ci/cd pipelines, test-driven development",
+		"docs/kit/introduction": "learning sveltekit, project setup, understanding framework basics, choosing between svelte and sveltekit, getting started with full-stack apps",
+		"docs/kit/creating-a-project": "project setup, starting new sveltekit app, initial development environment, first-time sveltekit users, scaffolding projects",
+		"docs/kit/project-types": "deployment, project setup, choosing adapters, ssg, spa, ssr, serverless, mobile apps, desktop apps, pwa, offline apps, browser extensions, separate backend, docker containers",
+		"docs/kit/project-structure": "project setup, understanding file structure, organizing code, starting new project, learning sveltekit basics",
+		"docs/kit/web-standards": "always, any sveltekit project, data fetching, forms, api routes, server-side rendering, deployment to various platforms",
+		"docs/kit/routing": "routing, navigation, multi-page apps, project setup, file structure, api endpoints, data loading, layouts, error pages, always",
+		"docs/kit/load": "data fetching, api calls, database queries, dynamic routes, page initialization, loading states, authentication checks, ssr data, form data, content rendering",
+		"docs/kit/form-actions": "forms, user input, data submission, authentication, login systems, user registration, progressive enhancement, validation errors",
+		"docs/kit/page-options": "prerendering static sites, ssr configuration, spa setup, client-side rendering control, url trailing slash handling, adapter deployment config, build optimization",
+		"docs/kit/state-management": "sveltekit, server-side rendering, ssr, state management, authentication, data persistence, load functions, context api, navigation, component lifecycle",
+		"docs/kit/remote-functions": "data fetching, server-side logic, database queries, type-safe client-server communication, forms, user input, mutations, authentication, crud operations, optimistic updates",
+		"docs/kit/building-your-app": "production builds, deployment preparation, build process optimization, adapter configuration, preview before deployment",
+		"docs/kit/adapters": "deployment, production builds, hosting setup, choosing deployment platform, configuring adapters",
+		"docs/kit/adapter-auto": "deployment, production builds, hosting setup, choosing deployment platform, ci/cd configuration",
+		"docs/kit/adapter-node": "deployment, production builds, node.js hosting, custom server setup, environment configuration, reverse proxy setup, docker deployment, systemd services",
+		"docs/kit/adapter-static": "static site generation, ssg, prerendering, deployment, github pages, spa mode, blogs, documentation sites, marketing sites",
+		"docs/kit/single-page-apps": "spa mode, single-page apps, client-only rendering, static hosting, mobile app wrappers, no server-side logic, adapter-static setup, fallback pages",
+		"docs/kit/adapter-cloudflare": "deployment, cloudflare workers, cloudflare pages, hosting setup, production builds, serverless deployment, edge computing",
+		"docs/kit/adapter-cloudflare-workers": "deploying to cloudflare workers, cloudflare workers sites deployment, legacy cloudflare adapter, wrangler configuration, cloudflare platform bindings",
+		"docs/kit/adapter-netlify": "deployment, netlify hosting, production builds, serverless functions, edge functions, static site hosting",
+		"docs/kit/adapter-vercel": "deployment, vercel hosting, production builds, serverless functions, edge functions, isr, image optimization, environment variables",
+		"docs/kit/writing-adapters": "custom deployment, building adapters, unsupported platforms, adapter development, custom hosting environments",
+		"docs/kit/advanced-routing": "advanced routing, dynamic routes, file viewers, nested paths, custom 404 pages, url validation, route parameters, multi-level navigation",
+		"docs/kit/hooks": "authentication, logging, error tracking, request interception, api proxying, custom routing, internationalization, database initialization, middleware logic, session management",
+		"docs/kit/errors": "error handling, custom error pages, 404 pages, api error responses, production error logging, error tracking, type-safe errors",
+		"docs/kit/link-options": "routing, navigation, multi-page apps, performance optimization, link preloading, forms with get method, search functionality, focus management, scroll behavior",
+		"docs/kit/service-workers": "offline support, pwa, caching strategies, performance optimization, precaching assets, network resilience, progressive web apps",
+		"docs/kit/server-only-modules": "api keys, environment variables, sensitive data protection, backend security, preventing data leaks, server-side code isolation",
+		"docs/kit/snapshots": "forms, user input, preserving form data, multi-step forms, navigation state, preventing data loss, textarea content, input fields, comment systems, surveys",
+		"docs/kit/shallow-routing": "modals, dialogs, image galleries, overlays, history-driven ui, mobile-friendly navigation, photo viewers, lightboxes, drawer menus",
+		"docs/kit/observability": "performance monitoring, debugging, observability, tracing requests, production diagnostics, analyzing slow requests, finding bottlenecks, monitoring server-side operations",
+		"docs/kit/packaging": "building component libraries, publishing npm packages, creating reusable svelte components, library development, package distribution",
+		"docs/kit/auth": "authentication, login systems, user management, session handling, jwt tokens, protected routes, user credentials, authorization checks",
+		"docs/kit/performance": "performance optimization, slow loading pages, production deployment, debugging performance issues, reducing bundle size, improving load times",
+		"docs/kit/icons": "icons, ui components, styling, css frameworks, tailwind, unocss, performance optimization, dependency management",
+		"docs/kit/images": "image optimization, responsive images, performance, hero images, product photos, galleries, cms integration, cdn setup, asset management",
+		"docs/kit/accessibility": "always, any sveltekit project, screen reader support, keyboard navigation, multi-page apps, client-side routing, internationalization, multilingual sites",
+		"docs/kit/seo": "seo optimization, search engine ranking, content sites, blogs, marketing sites, public-facing apps, sitemaps, amp pages, meta tags, performance optimization",
+		"docs/kit/faq": "troubleshooting package imports, library compatibility issues, client-side code execution, external api integration, middleware setup, database configuration, view transitions, yarn configuration",
+		"docs/kit/integrations": "project setup, css preprocessors, postcss, scss, sass, less, stylus, typescript setup, adding integrations, tailwind, testing, auth, linting, formatting",
+		"docs/kit/debugging": "debugging, breakpoints, development workflow, troubleshooting issues, vscode setup, ide configuration, inspecting code execution",
+		"docs/kit/migrating-to-sveltekit-2": "migration, upgrading from sveltekit 1 to 2, breaking changes, version updates",
+		"docs/kit/migrating": "migrating from sapper, upgrading legacy projects, sapper to sveltekit conversion, project modernization",
+		"docs/kit/additional-resources": "troubleshooting, getting help, finding examples, learning sveltekit, project templates, common issues, community support",
+		"docs/kit/glossary": "rendering strategies, performance optimization, deployment configuration, seo requirements, static sites, spas, server-side rendering, prerendering, edge deployment, pwa development",
+		"docs/kit/@sveltejs-kit": "forms, form actions, server-side validation, form submission, error handling, redirects, json responses, http errors, server utilities",
+		"docs/kit/@sveltejs-kit-hooks": "middleware, request processing, authentication chains, logging, multiple hooks, request/response transformation",
+		"docs/kit/@sveltejs-kit-node-polyfills": "node.js environments, custom servers, non-standard runtimes, ssr setup, web api compatibility, polyfill requirements",
+		"docs/kit/@sveltejs-kit-node": "node.js adapter, custom server setup, http integration, streaming files, node deployment, server-side rendering with node",
+		"docs/kit/@sveltejs-kit-vite": "project setup, vite configuration, initial sveltekit setup, build tooling",
+		"docs/kit/$app-environment": "always, conditional logic, client-side code, server-side code, build-time logic, prerendering, development vs production, environment detection",
+		"docs/kit/$app-forms": "forms, user input, data submission, progressive enhancement, custom form handling, form validation",
+		"docs/kit/$app-navigation": "routing, navigation, multi-page apps, programmatic navigation, data reloading, preloading, shallow routing, navigation lifecycle, scroll handling, view transitions",
+		"docs/kit/$app-paths": "static assets, images, fonts, public files, base path configuration, subdirectory deployment, cdn setup, asset urls, links, navigation",
+		"docs/kit/$app-server": "remote functions, server-side logic, data fetching, form handling, api endpoints, client-server communication, prerendering, file reading, batch queries",
+		"docs/kit/$app-state": "routing, navigation, multi-page apps, loading states, url parameters, form handling, error states, version updates, page metadata, shallow routing",
+		"docs/kit/$app-stores": "legacy projects, sveltekit pre-2.12, migration from stores to runes, maintaining older codebases, accessing page data, navigation state, app version updates",
+		"docs/kit/$app-types": "routing, navigation, type safety, route parameters, dynamic routes, link generation, pathname validation, multi-page apps",
+		"docs/kit/$env-dynamic-private": "api keys, secrets management, server-side config, environment variables, backend logic, deployment-specific settings, private data handling",
+		"docs/kit/$env-dynamic-public": "environment variables, client-side config, runtime configuration, public api keys, deployment-specific settings, multi-environment apps",
+		"docs/kit/$env-static-private": "server-side api keys, backend secrets, database credentials, private configuration, build-time optimization, server endpoints, authentication tokens",
+		"docs/kit/$env-static-public": "environment variables, public config, client-side data, api endpoints, build-time configuration, public constants",
+		"docs/kit/$lib": "project setup, component organization, importing shared components, reusable ui elements, code structure",
+		"docs/kit/$service-worker": "offline support, pwa, service workers, caching strategies, progressive web apps, offline-first apps",
+		"docs/kit/configuration": "project setup, configuration, adapters, deployment, build settings, environment variables, routing customization, prerendering, csp security, csrf protection, path configuration, typescript setup",
+		"docs/kit/cli": "project setup, typescript configuration, generated types, ./$types imports, initial project configuration",
+		"docs/kit/types": "typescript, type safety, route parameters, api endpoints, load functions, form actions, generated types, jsconfig setup",
+		"docs/svelte/overview": "always, any svelte project, getting started, learning svelte, introduction, project setup, understanding framework basics",
+		"docs/svelte/getting-started": "project setup, starting new svelte project, initial installation, choosing between sveltekit and vite, editor configuration",
+		"docs/svelte/svelte-files": "always, any svelte project, component creation, project setup, learning svelte basics",
+		"docs/svelte/svelte-js-files": "shared reactive state, reusable reactive logic, state management across components, global stores, custom reactive utilities",
+		"docs/svelte/what-are-runes": "always, any svelte 5 project, understanding core syntax, learning svelte 5, migration from svelte 4",
+		"docs/svelte/$state": "always, any svelte project, core reactivity, state management, counters, forms, todo apps, interactive ui, data updates, class-based components",
+		"docs/svelte/$derived": "always, any svelte project, computed values, reactive calculations, derived data, transforming state, dependent values",
+		"docs/svelte/$effect": "canvas drawing, third-party library integration, dom manipulation, side effects, intervals, timers, network requests, analytics tracking",
+		"docs/svelte/$props": "always, any svelte project, passing data to components, component communication, reusable components, component props",
+		"docs/svelte/$bindable": "forms, user input, two-way data binding, custom input components, parent-child communication, reusable form fields",
+		"docs/svelte/$inspect": "debugging, development, tracking state changes, reactive state monitoring, troubleshooting reactivity issues",
+		"docs/svelte/$host": "custom elements, web components, dispatching custom events, component library, framework-agnostic components",
+		"docs/svelte/basic-markup": "always, any svelte project, basic markup, html templating, component structure, attributes, events, props, text rendering",
+		"docs/svelte/if": "always, conditional rendering, showing/hiding content, dynamic ui, user permissions, loading states, error handling, form validation",
+		"docs/svelte/each": "always, lists, arrays, iteration, product listings, todos, tables, grids, dynamic content, shopping carts, user lists, comments, feeds",
+		"docs/svelte/key": "animations, transitions, component reinitialization, forcing component remount, value-based ui updates, resetting component state",
+		"docs/svelte/await": "async data fetching, api calls, loading states, promises, error handling, lazy loading components, dynamic imports",
+		"docs/svelte/snippet": "reusable markup, component composition, passing content to components, table rows, list items, conditional rendering, reducing duplication",
+		"docs/svelte/@render": "reusable ui patterns, component composition, conditional rendering, fallback content, layout components, slot alternatives, template reuse",
+		"docs/svelte/@html": "rendering html strings, cms content, rich text editors, markdown to html, blog posts, wysiwyg output, sanitized html injection, dynamic html content",
+		"docs/svelte/@attach": "tooltips, popovers, dom manipulation, third-party libraries, canvas drawing, element lifecycle, interactive ui, custom directives, wrapper components",
+		"docs/svelte/@const": "computed values in loops, derived calculations in blocks, local variables in each iterations, complex list rendering",
+		"docs/svelte/@debug": "debugging, development, troubleshooting, tracking state changes, monitoring variables, reactive data inspection",
+		"docs/svelte/bind": "forms, user input, two-way data binding, interactive ui, media players, file uploads, checkboxes, radio buttons, select dropdowns, contenteditable, dimension tracking",
+		"docs/svelte/use": "custom directives, dom manipulation, third-party library integration, tooltips, click outside, gestures, focus management, element lifecycle hooks",
+		"docs/svelte/transition": "animations, interactive ui, modals, dropdowns, notifications, conditional content, show/hide elements, smooth state changes",
+		"docs/svelte/in-and-out": "animation, transitions, interactive ui, conditional rendering, independent enter/exit effects, modals, tooltips, notifications",
+		"docs/svelte/animate": "sortable lists, drag and drop, reorderable items, todo lists, kanban boards, playlist editors, priority queues, animated list reordering",
+		"docs/svelte/style": "dynamic styling, conditional styles, theming, dark mode, responsive design, interactive ui, component styling",
+		"docs/svelte/class": "always, conditional styling, dynamic classes, tailwind css, component styling, reusable components, responsive design",
+		"docs/svelte/await-expressions": "async data fetching, loading states, server-side rendering, awaiting promises in components, async validation, concurrent data loading",
+		"docs/svelte/scoped-styles": "always, styling components, scoped css, component-specific styles, preventing style conflicts, animations, keyframes",
+		"docs/svelte/global-styles": "global styles, third-party libraries, css resets, animations, styling body/html, overriding component styles, shared keyframes, base styles",
+		"docs/svelte/custom-properties": "theming, custom styling, reusable components, design systems, dynamic colors, component libraries, ui customization",
+		"docs/svelte/nested-style-elements": "component styling, scoped styles, dynamic styles, conditional styling, nested style tags, custom styling logic",
+		"docs/svelte/svelte-boundary": "error handling, async data loading, loading states, error recovery, flaky components, error reporting, resilient ui",
+		"docs/svelte/svelte-window": "keyboard shortcuts, scroll tracking, window resize handling, responsive layouts, online/offline detection, viewport dimensions, global event listeners",
+		"docs/svelte/svelte-document": "document events, visibility tracking, fullscreen detection, pointer lock, focus management, document-level interactions",
+		"docs/svelte/svelte-body": "mouse tracking, hover effects, cursor interactions, global body events, drag and drop, custom cursors, interactive backgrounds, body-level actions",
+		"docs/svelte/svelte-head": "seo optimization, page titles, meta tags, social media sharing, dynamic head content, multi-page apps, blog posts, product pages",
+		"docs/svelte/svelte-element": "dynamic content, cms integration, user-generated content, configurable ui, runtime element selection, flexible components",
+		"docs/svelte/svelte-options": "migration, custom elements, web components, legacy mode compatibility, runes mode setup, svg components, mathml components, css injection control",
+		"docs/svelte/stores": "shared state, cross-component data, reactive values, async data streams, manual control over updates, rxjs integration, extracting logic",
+		"docs/svelte/context": "shared state, avoiding prop drilling, component communication, theme providers, user context, authentication state, configuration sharing, deeply nested components",
+		"docs/svelte/lifecycle-hooks": "component initialization, cleanup tasks, timers, subscriptions, dom measurements, chat windows, autoscroll features, migration from svelte 4",
+		"docs/svelte/imperative-component-api": "project setup, client-side rendering, server-side rendering, ssr, hydration, testing, programmatic component creation, tooltips, dynamic mounting",
+		"docs/svelte/testing": "testing, quality assurance, unit tests, integration tests, component tests, e2e tests, vitest setup, playwright setup, test automation",
+		"docs/svelte/typescript": "typescript setup, type safety, component props typing, generic components, wrapper components, dom type augmentation, project configuration",
+		"docs/svelte/custom-elements": "web components, custom elements, component library, design system, framework-agnostic components, embedding svelte in non-svelte apps, shadow dom",
+		"docs/svelte/v4-migration-guide": "upgrading svelte 3 to 4, version migration, updating dependencies, breaking changes, legacy project maintenance",
+		"docs/svelte/v5-migration-guide": "migrating from svelte 4 to 5, upgrading projects, learning svelte 5 syntax changes, runes migration, event handler updates",
+		"docs/svelte/faq": "getting started, learning svelte, beginner setup, project initialization, vs code setup, formatting, testing, routing, mobile apps, troubleshooting, community support",
+		"docs/svelte/svelte": "migration from svelte 4 to 5, upgrading legacy code, component lifecycle hooks, context api, mounting components, event dispatchers, typescript component types",
+		"docs/svelte/svelte-action": "typescript types, actions, use directive, dom manipulation, element lifecycle, custom behaviors, third-party library integration",
+		"docs/svelte/svelte-animate": "animated lists, sortable items, drag and drop, reordering elements, todo lists, kanban boards, playlist management, smooth position transitions",
+		"docs/svelte/svelte-attachments": "library development, component libraries, programmatic element manipulation, migrating from actions to attachments, spreading props onto elements",
+		"docs/svelte/svelte-compiler": "build tools, custom compilers, ast manipulation, preprocessors, code transformation, migration scripts, syntax analysis, bundler plugins, dev tools",
+		"docs/svelte/svelte-easing": "animations, transitions, custom easing, smooth motion, interactive ui, modals, dropdowns, carousels, page transitions, scroll effects",
+		"docs/svelte/svelte-events": "window events, document events, global event listeners, event delegation, programmatic event handling, cleanup functions, media queries",
+		"docs/svelte/svelte-legacy": "migration from svelte 4 to svelte 5, upgrading legacy code, event modifiers, class components, imperative component instantiation",
+		"docs/svelte/svelte-motion": "animation, smooth transitions, interactive ui, sliders, counters, physics-based motion, drag gestures, accessibility, reduced motion",
+		"docs/svelte/svelte-reactivity-window": "responsive design, viewport tracking, scroll effects, window resize handling, online/offline detection, zoom level tracking",
+		"docs/svelte/svelte-reactivity": "reactive data structures, state management with maps/sets, game boards, selection tracking, url manipulation, query params, real-time clocks, media queries, responsive design",
+		"docs/svelte/svelte-server": "server-side rendering, ssr, static site generation, seo optimization, initial page load, pre-rendering, node.js server, custom server setup",
+		"docs/svelte/svelte-store": "state management, shared data, reactive stores, cross-component communication, global state, computed values, data synchronization, legacy svelte projects",
+		"docs/svelte/svelte-transition": "animations, transitions, interactive ui, modals, dropdowns, tooltips, notifications, svg animations, list animations, page transitions",
+		"docs/svelte/compiler-errors": "animation, transitions, keyed each blocks, list animations",
+		"docs/svelte/compiler-warnings": "accessibility, a11y compliance, wcag standards, screen readers, keyboard navigation, aria attributes, semantic html, interactive elements",
+		"docs/svelte/runtime-errors": "debugging errors, error handling, troubleshooting runtime issues, migration to svelte 5, component binding, effects and reactivity",
+		"docs/svelte/runtime-warnings": "debugging state proxies, console logging reactive values, inspecting state changes, development troubleshooting",
+		"docs/svelte/legacy-overview": "migrating from svelte 3/4 to svelte 5, maintaining legacy components, understanding deprecated features, gradual upgrade process",
+		"docs/svelte/legacy-let": "migration, legacy svelte projects, upgrading from svelte 4, understanding old reactivity, maintaining existing code, learning runes differences",
+		"docs/svelte/legacy-reactive-assignments": "legacy mode, migration from svelte 4, reactive statements, computed values, derived state, side effects",
+		"docs/svelte/legacy-export-let": "legacy mode, migration from svelte 4, maintaining older projects, component props without runes, exporting component methods, renaming reserved word props",
+		"docs/svelte/legacy-$$props-and-$$restProps": "legacy mode migration, component wrappers, prop forwarding, button components, reusable ui components, spreading props to child elements",
+		"docs/svelte/legacy-on": "legacy mode, event handling, button clicks, forms, user interactions, component communication, event forwarding, event modifiers",
+		"docs/svelte/legacy-slots": "legacy mode, migrating from svelte 4, component composition, reusable components, passing content to components, modals, layouts, wrappers",
+		"docs/svelte/legacy-$$slots": "legacy mode, conditional slot rendering, optional content sections, checking if slots provided, migrating from legacy to runes",
+		"docs/svelte/legacy-svelte-fragment": "named slots, component composition, layout systems, avoiding wrapper divs, legacy svelte projects, slot content organization",
+		"docs/svelte/legacy-svelte-component": "dynamic components, component switching, conditional rendering, legacy mode migration, tabbed interfaces, multi-step forms",
+		"docs/svelte/legacy-svelte-self": "recursive components, tree structures, nested menus, file explorers, comment threads, hierarchical data",
+		"docs/svelte/legacy-component-api": "migration from svelte 3/4 to 5, legacy component api, maintaining old projects, understanding deprecated patterns"
+	}
+}

packages/mcp-stdio/CHANGELOG.md

@@ -0,0 +1,55 @@
+# @sveltejs/mcp
+
+## 0.1.3
+
+### Patch Changes
+
+- fix: use DNS to publish MCP ([#59](https://github.com/sveltejs/mcp/pull/59))
+
+## 0.1.2
+
+### Patch Changes
+
+- fix: publish to MCP registry (I really hope this time for real) ([`ef5241c`](https://github.com/sveltejs/mcp/commit/ef5241cbc204ad8bb84bde27db7c9d0a08280245))
+
+## 0.1.1
+
+### Patch Changes
+
+- feat: publish mcp to registry (maybe for real this time) ([`132943d`](https://github.com/sveltejs/mcp/commit/132943db3b04dbbd322d08926c0880c990a61f5f))
+
+## 0.1.0
+
+### Minor Changes
+
+- feat: publish to registry ([#45](https://github.com/sveltejs/mcp/pull/45))
+
+### Patch Changes
+
+- feat: add autofixer to tell the LLM to check if some function called in effect is assigning state #26 ([`73d7625`](https://github.com/sveltejs/mcp/commit/73d7625b3ca6a812ba91883ea668d80ff1e7c703))
+
+- feat: add bind:this -> attachment and action -> attachment autofixer #20 ([`73d7625`](https://github.com/sveltejs/mcp/commit/73d7625b3ca6a812ba91883ea668d80ff1e7c703))
+
+## 0.0.4
+
+### Patch Changes
+
+- fix: allow TS `.svelte.ts` modules ([#49](https://github.com/sveltejs/mcp/pull/49))
+
+## 0.0.3
+
+### Patch Changes
+
+- fix: check effect.pre in assign-in-effect ([#41](https://github.com/sveltejs/mcp/pull/41))
+
+- feat: `use_cases` documentation metadata ([#29](https://github.com/sveltejs/mcp/pull/29))
+
+- fix: change title names to allow for claude code to use the prompt ([`725f785`](https://github.com/sveltejs/mcp/commit/725f785766d04e9ed810a7c3f6bcfdb2e2b8234c))
+
+- fix: enable doc tools ([`cb316c5`](https://github.com/sveltejs/mcp/commit/cb316c5b3ebc712946969d2d57236d159e796d58))
+
+## 0.0.2
+
+### Patch Changes
+
+- feat: latest version ([#25](https://github.com/sveltejs/mcp/pull/25))

packages/mcp-stdio/README.md

@@ -0,0 +1,16 @@
+# @sveltejs/mcp
+
+The CLI version of the Svelte MCP.
+
+You can run it directly with
+
+```bash
+npx @sveltejs/mcp
+```
+
+or install it and then run it
+
+```bash
+pnpm i @sveltejs/mcp
+pnpm svelte-mcp
+```

packages/mcp-stdio/checksums/registry_1.2.3_checksums.txt

@@ -0,0 +1,25 @@
+4e7c92f289d903d4649c59f82df6e7b014caebb49d8b5c1d2466667fd6caf68c  mcp-publisher_1.2.3_darwin_amd64.tar.gz
+09637600871bec7cce25e098d6ce23b7c7577a8e537f618d24a5630d2d782afa  mcp-publisher_1.2.3_darwin_amd64.tar.gz.sbom.json
+9ac90d3182bae9af4b48fb3cd19c3cade3e52c8ea25d7aa14327326a209bcf71  mcp-publisher_1.2.3_darwin_arm64.tar.gz
+0b2cedf3f42c5a7b33bdd3f72ce7f4c938ff4fe2aca5cabd60094dc4b855c1f6  mcp-publisher_1.2.3_darwin_arm64.tar.gz.sbom.json
+868a54268f21580ec97ec9dfc4fc3442a7f69c241ee7c745c7032f2e43cdf47b  mcp-publisher_1.2.3_linux_amd64.tar.gz
+a7bce190ea1c1b5682d1b5069b20dd9c67f3688e02dbc93e7273e942097dac4d  mcp-publisher_1.2.3_linux_amd64.tar.gz.sbom.json
+319cdefb4c4f19fa35eeb0337e30be3169dbf3107a8c160651691a6342a6783b  mcp-publisher_1.2.3_linux_arm64.tar.gz
+bc9309ab843531e811990dcf637b9912c470fc38eddc13a5af0512fcef498944  mcp-publisher_1.2.3_linux_arm64.tar.gz.sbom.json
+298026e0252547046f50dcb7817239d44107f5a3ae64f4e43b6a31d0c5b89f9b  mcp-publisher_1.2.3_windows_amd64.tar.gz
+971b835ce4df2b37ddcf8591d4400dc94d1e3f730b181b325c905261b75b9e6e  mcp-publisher_1.2.3_windows_amd64.tar.gz.sbom.json
+64da67b451d0fba12f15f7b0f6ab8d71c718bb2263f90f198ff1fe15a5ff2024  mcp-publisher_1.2.3_windows_arm64.tar.gz
+f591b2153f1277cb67817763a23de9e77188fa94b893fac00e91d13160d696e3  mcp-publisher_1.2.3_windows_arm64.tar.gz.sbom.json
+265377b343500898e3c3fea798926ff2695fe7500c1225c8a97f390a5892d849  registry-1.2.3.tar.gz
+a9c03a84d2e30176d6ed7b493e7e3a8a05d446f1611a35bad6007fbe3ba80657  registry_1.2.3_darwin_amd64.tar.gz
+4db4e8a0b1f3d0ca193e5356fef89b74c0666cdf56d6f3c8fc2d0aba1cac3b55  registry_1.2.3_darwin_amd64.tar.gz.sbom.json
+2933a11990db16035e4896f394ada389166046911e6868f79b84636048dfe6fb  registry_1.2.3_darwin_arm64.tar.gz
+edd36e62f4b1c5b857da1862f20cbcf6dd3dfd9717888c08bd5c25740d8b11f6  registry_1.2.3_darwin_arm64.tar.gz.sbom.json
+59bdd9977795891220e6fdb8f79dd7d14f48166362e94699bee59e745f7c7df6  registry_1.2.3_linux_amd64.tar.gz
+7f7efb180aa312f674377e32a92ac3600e50c62e37d697d2d16acfe60227a2fd  registry_1.2.3_linux_amd64.tar.gz.sbom.json
+7fef1088a664850dd75e54a699fce6a5fb32e8ebbdc0d2869b6b34945727ba9c  registry_1.2.3_linux_arm64.tar.gz
+ca0488e5cbb04c8ee515e1b80e08b755a55d6af1784368a2f55e429137359a25  registry_1.2.3_linux_arm64.tar.gz.sbom.json
+5bc29310aacc08437dcc973cfc1e1129f7065d2050396012f5ed98c4eb0ea75b  registry_1.2.3_windows_amd64.tar.gz
+e918c604f23e6d33f9952f18eddf0e50e50d7ce3e87ca5258bf78f4f1da243ab  registry_1.2.3_windows_amd64.tar.gz.sbom.json
+394cad1e6f5e37a583defdd522edbff854de5035d6e025a195664db31b58c0c0  registry_1.2.3_windows_arm64.tar.gz
+c93df66f3257ba4b9c29f7bfded4cf04d712ec220b044ddfa019da3e4bd6475f  registry_1.2.3_windows_arm64.tar.gz.sbom.json

packages/mcp-stdio/package.json

@@ -0,0 +1,45 @@
+{
+	"name": "@sveltejs/mcp",
+	"version": "0.1.3",
+	"type": "module",
+	"license": "MIT",
+	"mcpName": "io.github.sveltejs/svelte",
+	"homepage": "https://github.com/sveltejs/mcp#readme",
+	"bugs": {
+		"url": "https://github.com/sveltejs/mcp/issues"
+	},
+	"bin": {
+		"svelte-mcp": "./dist/index.js"
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/sveltejs/mcp.git",
+		"path": "packages/mcp-stdio"
+	},
+	"files": [
+		"dist"
+	],
+	"publishConfig": {
+		"access": "public"
+	},
+	"scripts": {
+		"build": "tsdown && publint",
+		"dev": "tsdown --watch",
+		"test": "vitest",
+		"check": "tsc --noEmit",
+		"check:publint": "publint --strict",
+		"update:version": "node scripts/update-version.ts"
+	},
+	"devDependencies": {
+		"@sveltejs/mcp-server": "workspace:^",
+		"@tmcp/transport-stdio": "^0.3.1",
+		"@types/node": "^22.15.17",
+		"publint": "^0.3.13",
+		"tsdown": "^0.15.0",
+		"typescript": "^5.8.3",
+		"vitest": "^3.1.3"
+	},
+	"dependencies": {
+		"eslint": "^9.36.0"
+	}
+}

packages/mcp-stdio/scripts/update-version.ts

@@ -0,0 +1,14 @@
+import { readFile, writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+const package_json_string = await readFile(resolve('./package.json'), 'utf-8');
+const package_json = JSON.parse(package_json_string);
+
+const server_json_path = resolve('./server.json');
+const server_json_string = await readFile(server_json_path, 'utf-8');
+const server_json = JSON.parse(server_json_string);
+
+server_json.version = package_json.version;
+server_json.packages[0].version = package_json.version;
+
+await writeFile(server_json_path, JSON.stringify(server_json, null, '\t') + '\n', 'utf-8');

packages/mcp-stdio/server.json

@@ -0,0 +1,30 @@
+{
+	"$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
+	"name": "dev.svelte/mcp",
+	"description": "The official Svelte MCP server providing docs and autofixing tools for Svelte development",
+	"repository": {
+		"id": "1054419133",
+		"url": "https://github.com/sveltejs/mcp",
+		"subfolder": "packages/mcp-stdio",
+		"source": "github"
+	},
+	"version": "0.1.3",
+	"websiteUrl": "https://svelte.dev/docs/mcp/overview",
+	"packages": [
+		{
+			"registryType": "npm",
+			"identifier": "@sveltejs/mcp",
+			"version": "0.1.3",
+			"runtimeHint": "npx",
+			"transport": {
+				"type": "stdio"
+			}
+		}
+	],
+	"remotes": [
+		{
+			"url": "https://mcp.svelte.dev/mcp",
+			"type": "streamable-http"
+		}
+	]
+}

packages/mcp-stdio/src/index.ts

@@ -0,0 +1,7 @@
+#! /usr/bin/env node
+import { server } from '@sveltejs/mcp-server';
+import { StdioTransport } from '@tmcp/transport-stdio';
+
+const transport = new StdioTransport(server);
+
+transport.listen();

packages/mcp-stdio/tsconfig.json

@@ -0,0 +1,5 @@
+{
+	"extends": "../../tsconfig.json",
+	"include": ["src"],
+	"exclude": ["node_modules", "dist"]
+}