AI agent skill
MCP Builder
Design and implement Model Context Protocol servers so an agent can call external tools with typed schemas instead of stuffing API docs into a skill.
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When to use this skill
Use MCP Builder when the agent must call a live system (GitHub, Stripe, a database, a browser) with authentication and up-to-date schemas. Skills hold procedural knowledge; MCP servers hold tools.
When not to use it
If the workflow is "remember how we write release notes", that is a skill, not MCP. Do not wrap a static style guide in a server.
How to install
- Personal install: create ~/.claude/skills/mcp-builder/SKILL.md (and any bundled scripts) so Claude Code, Claude Desktop, and compatible agents can load it in every project.
- Project install: commit the same folder at .claude/skills/mcp-builder/ so teammates get the skill with the repo.
- Restart the agent session after copying files so it re-scans the skills directory, then ask for the task in words that match the skill description.
What this skill does
MCP servers expose tools an agent can invoke. This skill walks through schemas, error handling, and the boundary between a SKILL.md (instructions) and a server (side effects).
Prefer a skill when the knowledge is stable. Prefer MCP when the data changes or the action must actually run.
Intended uses
- Stand up a typed MCP server for an internal API
- Decide skill vs MCP vs plugin for a new workflow
- Review tool schemas before shipping to a team
Related skills
Related skills in this directory, for comparison before you install another skill.
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Skill Creator
Scaffold a new AI agent skill from a plain-language job description: folder, SKILL.md frontmatter, trigger description, and a first draft of the instructions.
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Up-to-date Claude API reference for model IDs, tool use, MCP, prompt caching, streaming, and SDK patterns so an agent stops guessing against stale docs.
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Give an agent a headed or headless browser CLI to open pages, snapshot the DOM, and click through flows without a separate MCP server.
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