docs: document the trigger skills installer (replaces agent rules)

[ericallam]

Summary

Updates the AI-tooling docs for the new trigger skills installer that shipped in #3868. The Skills page now documents trigger skills (skills bundled with the CLI, version-matched to your SDK) and the four bundled skills: authoring-tasks, realtime-and-frontend, authoring-chat-agent, chat-agent-advanced. The old Agent Rules page becomes a short "rules are now skills" redirect (kept because existing redirects and the CLI link point at it), and the Building with AI overview collapses the three-way Skills/Rules/MCP comparison into Skills vs MCP.

Hold until the v4.5 CLI release ships, since trigger skills is not on npm until then.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

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Run ID: eb0b5c8b-ec28-404d-8e3d-8a66a9da9cbc

📥 Commits

Reviewing files that changed from the base of the PR and between 5117982 and afa3b53.

📒 Files selected for processing (2)

• docs/building-with-ai.mdx
• docs/skills.mdx

✅ Files skipped from review due to trivial changes (1)

• docs/building-with-ai.mdx

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/skills.mdx

📜 Recent review details

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: Mintlify Deployment
• GitHub Check: Analyze (javascript-typescript)

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Walkthrough

This PR updates documentation across three files to align with a new installation mechanism for Trigger.dev agent skills. The primary change introduces npx trigger.dev@latest skills as the unified CLI command for installing agent skills into native AI tool directories. The skills.mdx page is comprehensively rewritten with new sections on supported assistants, version pinning behavior, and updated capability coverage. The building-with-ai.mdx and mcp-agent-rules.mdx files are updated to reference the new installation flow, with mcp-agent-rules.mdx condensed significantly to focus on the transition narrative.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change—documenting the new trigger skills installer and its role in replacing agent rules.
Description check	✅ Passed	The description provides a clear summary of changes and context, though it lacks required checklist items and testing documentation sections from the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/trigger-skills-command

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Project	Status	Preview	Updated (UTC)
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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🚩 mcp-introduction.mdx still links to Agent Rules with outdated description

The file docs/mcp-introduction.mdx:385 still contains a Card linking to /mcp-agent-rules with the old description "Install comprehensive rule sets directly into your AI client." While the link itself still works (the page exists as a deprecation notice), the card description is now misleading since agent rules have been replaced by skills. This PR didn't update that file. It's a minor consistency gap — not a bug since the page still exists and serves as a redirect.

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