mcp-server-authoringlisted

# MCP Server Authoring Producer-side patterns for **building** a Python Model Context Protocol server with the official SDK's `FastMCP` (or the standalone `fastmcp` package). Applies to any Python MCP server you own — the guidance is portfolio-independent. For *consuming* / installing servers into a project, this is the wrong skill — see the table below. ## When to Use This Skill | Use this skill when... | Use a different skill when... | |------------------------|-------------------------------| | Building or scaffolding a new MCP server | Installing an existing server into `.mcp.json` → `agent-patterns-plugin:mcp-management` | | Adding a tool / resource / prompt to a server | Running MCP compliance checks on a project → `configure-plugin:configure-mcp` | | Wiring a server's tests, lint, release-please | An agent calls 50+ MCP tools and needs the code-execution pattern → `agent-patterns-plugin:mcp-code-execution` | | Choosing transport (stdio vs HTTP) for a server you own | Managing OAuth for a remote server you consume → `mcp-management` | ## The Build Path Build a server in this order. Each step's *why* is the load-bearing part — it is what lets you generalize past the example. ### Step 1 — Scaffold the project ```bash uv init --package my-server && cd my-server uv add "mcp[cli]" # bundled SDK; or `uv add fastmcp` for the standalone package uv add --group dev pytest ruff ty ``` **Why `uv init --package`**: it lays down a `src/` package + `pyproject.toml` w