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fastmcp

Build, test, and deploy Python MCP servers with FastMCP templates and CLI workflows.

Updated Sep 10, 2026
Search Tags:#deployment#python#cli#MCP#MCP server#FastMCP#api wrapper
One-click install
npx skills add https://github.com/loteiron/ZeusAgent --skill fastmcp-loteiron
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fastmcp
Source: https://github.com/loteiron/ZeusAgent/tree/main/optional-skills/mcp/fastmcp
Command: npx skills add https://github.com/loteiron/ZeusAgent --skill fastmcp-loteiron

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires fastmcp, httpx, and includes scripts (resource) and references (resource) components.

What problem does it solve? Writing an MCP server from scratch involves boilerplate, unclear tool design, and uncertain validation steps. This Skill provides ready-made FastMCP server templates, a scaffolding script, and a tested CLI workflow so you can go from idea to a validated, installable MCP server without guesswork. ## Core Features & Use Cases - Starter Templates: Three production-shaped templates covering the most common server types: REST API wrapper with auth headers, read-only SQLite database server, and text-file inspection server. - Scaffolding Script: scripts/scaffold_fastmcp.py copies a template and replaces the server name placeholder in one command. - CLI Validation Workflow: Step-by-step guidance for fastmcp inspect, fastmcp list, and fastmcp call to smoke-test every tool before integration, plus install commands for Claude Code, Claude Desktop, and Cursor. - Use Case: You need to expose your company's ticketing API to an AI agent. Scaffold the API wrapper template, implement two typed tools, validate them with fastmcp call, then install the server into your MCP client or deploy it as an HTTP endpoint. ## Quick Start Ask the agent to scaffold a new FastMCP server from the api_wrapper template named after your API and validate it with the FastMCP CLI.

Frequently Asked Questions about fastmcp

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

FAQPage Schema
How do I build an MCP server in Python with FastMCP?▼

Install fastmcp with pip, create a FastMCP instance, and define tools with the @mcp.tool decorator using typed parameters and docstrings. Scaffold from a starter template, then validate with fastmcp inspect and fastmcp call before integrating.

How to test a FastMCP server before installing it?▼

Run fastmcp inspect on your server file to verify it loads, then use fastmcp list to enumerate tools and fastmcp call to execute each tool with real arguments. Every new tool should pass at least one real call before integration.

Can I install a FastMCP server into Claude Desktop or Cursor?▼

Yes, FastMCP supports direct installation with commands like fastmcp install claude-desktop server.py and fastmcp install cursor server.py. Client installs run in isolated environments, so declare dependencies with flags like --with or editable installs.

Why does fastmcp inspect fail on my server file?▼

Inspection usually fails when the file has import-time side effects that crash, the FastMCP object name in the file:object spec is wrong, or optional template dependencies like httpx are missing. Fix imports and verify the object name first.

When should I use FastMCP versus connecting an existing MCP server?▼

Use FastMCP when you are building a new server in Python from scratch. If a server already exists and only needs to be connected to your agent, configure it directly in the client config instead of rebuilding it.

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