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Nabeelshar

FastAPI MCP Server

by Nabeelshar
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FastAPI MCP Server

A Model Context Protocol (MCP) server that provides comprehensive tools for introspecting and working with FastAPI applications.

Features

🔧 Tools

  1. load_fastapi_app - Load a FastAPI application from a module path

  2. list_routes - List all routes with optional filtering

  3. get_route_details - Get comprehensive details about a specific route

  4. get_openapi_schema - Extract the OpenAPI schema

  5. list_models - List all Pydantic models used in the app

  6. get_model_schema - Get detailed schema for a specific model

  7. search_routes - Search routes by query and criteria

  8. analyze_dependencies - Analyze dependency injection usage

  9. get_route_source - View the source code of route handlers

Installation

pip install -e .

Usage

With Claude Desktop

Add to your claude_desktop_config.json:

{ "mcpServers": { "fastapi": { "command": "python", "args": [ "-m", "fastapi_mcp_server.server" ], "cwd": "/path/to/your/fastapi/project" } } }

Standalone

# From your FastAPI project directory python -m fastapi_mcp_server.server

Example Usage

1. Load Your FastAPI App

Tool: load_fastapi_app Arguments: {"app_path": "main:app"}

2. List All Routes

Tool: list_routes Arguments: {}

Or with filters:

Tool: list_routes Arguments: { "method_filter": "GET", "tag_filter": "users" }

3. Get Route Details

Tool: get_route_details Arguments: { "path": "/users/{user_id}", "method": "GET" }

4. Search for Routes

Tool: search_routes Arguments: { "query": "authentication", "has_auth": true }

5. View Route Source Code

Tool: get_route_source Arguments: { "path": "/users", "method": "POST" }

6. List All Models

Tool: list_models Arguments: {}

7. Get Model Schema

Tool: get_model_schema Arguments: {"model_name": "User"}

8. Get OpenAPI Schema

Tool: get_openapi_schema Arguments: {}

Or for specific paths:

Tool: get_openapi_schema Arguments: { "include_only": ["/users", "/users/{user_id}"] }

9. Analyze Dependencies

Tool: analyze_dependencies Arguments: {}

Example FastAPI App

See example_app.py for a sample FastAPI application to test with.

Use Cases

🔍 API Discovery

  • Quickly understand what endpoints exist

  • Find routes by functionality or path

  • Explore API structure

📚 Documentation Generation

  • Extract OpenAPI schemas

  • Get detailed parameter information

  • View model schemas with examples

🐛 Debugging

  • Inspect route configurations

  • View dependency injection hierarchy

  • Check parameter validations

🔨 Development

  • Generate client code from schemas

  • Understand existing APIs before modification

  • Find all routes using specific models

🧪 Testing

  • List all endpoints for test coverage

  • Get parameter requirements for test cases

  • Validate response models

Requirements

  • Python 3.10+

  • FastAPI 0.100.0+

  • MCP 1.0.0+

  • Pydantic 2.0.0+

Contributing

Contributions are welcome! This tool helps developers work more efficiently with FastAPI applications.

License

MIT License - feel free to use in your projects!

Author

Created as part of the FastAPI ecosystem to improve developer experience with AI-assisted development.

This server cannot be installed

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security - not tested
A
license - permissive license
-
quality - not tested

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