feat(integrations): add Devin for Terminal skills-based integration (#2364)

* feat(integrations): add Devin for Terminal skills-based integration

- Register DevinIntegration as a SkillsIntegration with .devin/skills/ layout
- Add catalog entry, docs row, and supported-agents listing
- Display /speckit-<command> hyphen syntax in init "Next Steps" panel
  (matches Claude/Cursor/Copilot skills mode, since Devin invokes skills
  by directory name)

Closes #2346

* fix(devin): implement -p non-interactive dispatch; clarify skills comment

Addresses Copilot review on PR #2364:

- Override build_exec_args() in DevinIntegration to emit
  'devin -p <prompt> [--model X]' for non-interactive text dispatch
  (verified Devin CLI supports -p / --print). Returns None when
  output_json=True since Devin has no structured-output flag, so
  CommandStep workflows that require JSON cleanly raise
  NotImplementedError instead of crashing on an unknown CLI flag.
  requires_cli=True is retained for tool detection.

- Extend the skills-integrations enumeration comment in
  specify_cli/__init__.py to include copilot and devin so the
  comment matches the code below it.

* fix(devin): always return exec args; document plain-text stdout

Addresses third Copilot review comment on PR #2364.

Returning None from build_exec_args() when output_json=True
incorrectly used the codebase's IDE-only sentinel: workflow
CommandStep checks 'impl.build_exec_args("test") is None' to
detect non-dispatchable integrations (test_workflows.py exercises
this with WindsurfIntegration). The previous implementation made
Devin appear non-dispatchable to all command steps even though it
runs fine via 'devin -p'.

Always return the args list. When output_json is requested, Devin
is still dispatched and returns plain-text stdout instead of
structured JSON; the docstring documents this explicitly.

* docs(devin): include claude in skills-integrations enumeration comment

Addresses Copilot review on PR #2364: the comment listing skills
integrations omitted Claude, which is also a SkillsIntegration
subclass. Updated to keep the comment accurate for future readers.

* test(devin): add build_exec_args regression tests; bump catalog updated_at

Addresses Copilot review on PR #2364, per @mnriem's request to
'address the Copilot feedback, especially the testing ask':

- tests/integrations/test_integration_devin.py: add TestDevinBuildExecArgs
  with three regression assertions:
    * build_exec_args returns args (not the None IDE-only sentinel)
    * --output-format is never emitted, regardless of output_json
    * --model flag is passed through correctly
- integrations/catalog.json: bump top-level updated_at to reflect the
  Devin entry addition so downstream catalog consumers can detect the
  change reliably.

src/specify_cli/__init__.py

@@ -1528,7 +1528,7 @@ def init(
         step_num = 2
 
     # Determine skill display mode for the next-steps panel.
-    # Skills integrations (codex, kimi, agy, trae, cursor-agent) should show skill invocation syntax.
+    # Skills integrations (codex, claude, kimi, agy, trae, cursor-agent, copilot, devin) should show skill invocation syntax.
     from .integrations.base import SkillsIntegration as _SkillsInt
     _is_skills_integration = isinstance(resolved_integration, _SkillsInt) or getattr(resolved_integration, "_skills_mode", False)
 
@@ -1539,7 +1539,8 @@ def init(
     trae_skill_mode = selected_ai == "trae"
     cursor_agent_skill_mode = selected_ai == "cursor-agent" and (ai_skills or _is_skills_integration)
     copilot_skill_mode = selected_ai == "copilot" and _is_skills_integration
-    native_skill_mode = codex_skill_mode or claude_skill_mode or kimi_skill_mode or agy_skill_mode or trae_skill_mode or cursor_agent_skill_mode or copilot_skill_mode
+    devin_skill_mode = selected_ai == "devin"
+    native_skill_mode = codex_skill_mode or claude_skill_mode or kimi_skill_mode or agy_skill_mode or trae_skill_mode or cursor_agent_skill_mode or copilot_skill_mode or devin_skill_mode
 
     if codex_skill_mode and not ai_skills:
         # Integration path installed skills; show the helpful notice
@@ -1551,6 +1552,9 @@ def init(
     if cursor_agent_skill_mode and not ai_skills:
         steps_lines.append(f"{step_num}. Start Cursor Agent in this project directory; spec-kit skills were installed to [cyan].cursor/skills[/cyan]")
         step_num += 1
+    if devin_skill_mode:
+        steps_lines.append(f"{step_num}. Start Devin in this project directory; spec-kit skills were installed to [cyan].devin/skills[/cyan]")
+        step_num += 1
     usage_label = "skills" if native_skill_mode else "slash commands"
 
     def _display_cmd(name: str) -> str:
@@ -1560,7 +1564,7 @@ def init(
             return f"/speckit-{name}"
         if kimi_skill_mode:
             return f"/skill:speckit-{name}"
-        if cursor_agent_skill_mode or copilot_skill_mode:
+        if cursor_agent_skill_mode or copilot_skill_mode or devin_skill_mode:
             return f"/speckit-{name}"
         return f"/speckit.{name}"
 

src/specify_cli/integrations/__init__.py

@@ -56,6 +56,7 @@ def _register_builtins() -> None:
     from .codex import CodexIntegration
     from .copilot import CopilotIntegration
     from .cursor_agent import CursorAgentIntegration
+    from .devin import DevinIntegration
     from .forge import ForgeIntegration
     from .gemini import GeminiIntegration
     from .generic import GenericIntegration
@@ -86,6 +87,7 @@ def _register_builtins() -> None:
     _register(CodexIntegration())
     _register(CopilotIntegration())
     _register(CursorAgentIntegration())
+    _register(DevinIntegration())
     _register(ForgeIntegration())
     _register(GeminiIntegration())
     _register(GenericIntegration())

src/specify_cli/integrations/devin/__init__.py

@@ -0,0 +1,65 @@
+"""Devin for Terminal integration — skills-based agent.
+
+Devin uses the ``.devin/skills/speckit-<name>/SKILL.md`` layout and
+reads project context from ``AGENTS.md`` at the repo root. The CLI
+binary is ``devin`` and skills are invoked via ``/<name>`` inside an
+interactive ``devin`` session.
+
+See: https://cli.devin.ai/docs/extensibility/skills/overview
+"""
+
+from __future__ import annotations
+
+from ..base import IntegrationOption, SkillsIntegration
+
+
+class DevinIntegration(SkillsIntegration):
+    """Integration for Cognition AI's Devin for Terminal."""
+
+    key = "devin"
+    config = {
+        "name": "Devin for Terminal",
+        "folder": ".devin/",
+        "commands_subdir": "skills",
+        "install_url": "https://cli.devin.ai/docs",
+        "requires_cli": True,
+    }
+    registrar_config = {
+        "dir": ".devin/skills",
+        "format": "markdown",
+        "args": "$ARGUMENTS",
+        "extension": "/SKILL.md",
+    }
+    context_file = "AGENTS.md"
+
+    def build_exec_args(
+        self,
+        prompt: str,
+        *,
+        model: str | None = None,
+        output_json: bool = True,
+    ) -> list[str] | None:
+        """Build non-interactive CLI args for Devin for Terminal.
+
+        Devin supports ``devin -p <prompt>`` for single-turn execution
+        and ``--model`` for model selection, but its CLI has no flag
+        for structured JSON output. When ``output_json`` is requested,
+        Devin is still dispatched normally and returns plain-text
+        stdout instead of structured JSON. ``requires_cli=True`` is
+        kept on the integration for tool detection.
+        """
+        args = [self.key, "-p", prompt]
+        if model:
+            args.extend(["--model", model])
+        return args
+
+    @classmethod
+    def options(cls) -> list[IntegrationOption]:
+        return [
+            IntegrationOption(
+                "--skills",
+                is_flag=True,
+                default=True,
+                help="Install as agent skills (default for Devin)",
+            ),
+        ]