fastmcp

Create production-grade Python MCP servers with storage, middleware, and OAuth.

961|99|Updated Oct 20, 2025
One-click install
npx skills add https://github.com/jezweb/claude-skills --skill fastmcp
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: fastmcp
Source: https://github.com/jezweb/claude-skills/tree/main/skills/fastmcp
Command: npx skills add https://github.com/jezweb/claude-skills --skill fastmcp

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires fastmcp>=2.13.0, httpx, pydantic, py-key-value-aio, cryptography, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill eliminates the complexity and common errors when building Model Context Protocol servers, providing battle-tested patterns that save developers days of debugging and configuration work.

Core Features & Use Cases

  • Production-Ready Architecture: Complete server setup with storage backends, middleware, and authentication patterns.
  • Error Prevention: Prevents 25 common errors including circular imports, storage issues, and OAuth misconfigurations.
  • Use Case: Imagine you need to expose your company's internal API to Claude. Use this Skill to automatically generate a secure MCP server with OAuth authentication, connection pooling, and error handling.

Quick Start

Use the fastmcp skill to create an MCP server that wraps your existing API endpoints with proper authentication and rate limiting.

Token Efficiency

  • Without skill: ~50-70k tokens, 8-15 errors.
  • With skill: ~3-5k tokens, 0 errors.
  • Savings: 90-95% token reduction.

Frequently Asked Questions about fastmcp

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build a production-grade MCP server in Python?

Build production MCP servers using fastmcp with complete architecture including storage backends, middleware, OAuth authentication, and error prevention patterns. The skill provides battle-tested configurations that reduce development time from hours to minutes while eliminating 25 common errors like circular imports and misconfigured authentication.

Can I expose an internal API to Claude with OAuth authentication?

Yes. Use fastmcp to wrap existing API endpoints with secure OAuth authentication, connection pooling, and rate limiting. The skill automates server generation with token storage, middleware chains, and error handling built in, eliminating manual configuration work.

What storage backends does fastmcp support for MCP servers?

fastmcp supports memory, disk, and Redis storage backends configurable per-server. Choose the backend matching your deployment context—memory for development, disk for single-machine production, or Redis for distributed cloud environments with shared state.

How do I prevent common errors when deploying MCP servers to the cloud?

fastmcp prevents 25 deployment pitfalls including circular imports, storage misconfiguration, OAuth token leaks, and cloud-specific failures. Use module-level server exports, PyPI-only dependencies, and the skill's preventive middleware patterns to deploy reliably.

Does fastmcp integrate with OpenAPI definitions?

Yes. fastmcp integrates with OpenAPI to automatically expose tools, resources, and prompts to LLMs. Map existing OpenAPI specs directly into MCP servers without manual tool definition, reducing token usage and setup complexity.

What's the difference in development effort between building MCP servers manually versus using fastmcp?

Manual MCP development requires 50-70k tokens and produces 8-15 errors; fastmcp reduces this to 3-5k tokens with zero errors. The skill delivers 90-95% token savings and eliminates debugging cycles through production-ready patterns and validation.