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mcp-server-builder

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Use to build, wire up, or debug an MCP (Model Context Protocol) server that gives Claude access to an internal API, database, or SaaS tool. Trigger when the user wants Claude to connect to their own system, asks for an MCP server, needs custom tools for Claude Code or the Claude app, or an existing server's tools are not showing up.

mcp-server-builder/SKILL.md

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# MCP Server Builder

An MCP server is how Claude reaches a system it does not otherwise know about — your database, your internal API, your ops tooling. The protocol is small. Almost every real problem is a design problem: which tools to expose and what they return.

## Decide the Shape First

**Local (stdio)** — runs on the user's machine, launched by the client, credentials from the local environment. Right for developer tooling and anything touching localhost or a local database. Only that machine gets it.

**Remote (HTTP)** — deployed once, reached by URL, OAuth for identity. Right when a team needs it, or when the data lives in a service rather than on a laptop. Everyone gets updates the moment you deploy.

Build remote when more than one person will use it. Retrofitting local-only to multi-user later means redoing auth from scratch.

## Tool Design — the part that matters
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