ezmcp

Easy-to-use MCP server framework specialized for SSE.

Overview

ezmcp is a lightweight framework that makes it easy to create MCP-compatible servers using a FastAPI-like syntax. It provides a simple decorator-based API for defining tools that can be called by MCP clients.

Features

• FastAPI-style decorator API for defining MCP tools
• Automatic parameter validation and type conversion
• Automatic generation of tool schemas from function signatures
• Built-in support for SSE transport
• FastAPI-style middleware support
• Easy integration with existing Starlette applications
• Interactive documentation page for exploring and testing tools

!docs_image

Installation

pip install ezmcp

Quick Start

from ezmcp import ezmcp, TextContent

# Create an ezmcp application
app = ezmcp("my-app")

# Define a tool
@app.tool(description="Echo a message back to the user")
async def echo(message: str):
    """Echo a message back to the user."""
    return [TextContent(type="text", text=f"Echo: {message}")]

# Run the application
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8000)

Once the server is running, you can:

• Access the interactive documentation at http://localhost:8000/docs
• Connect to the SSE endpoint at http://localhost:8000/sse

Middleware

ezmcp supports middleware similar to FastAPI, allowing you to add behavior that is applied across your entire application.

from starlette.requests import Request

from ezmcp import TextContent, ezmcp

app = ezmcp("my-app")

@app.middleware
async def process_time_middleware(request: Request, call_next):
    """Add a header with the processing time."""
    import time
    start_time = time.perf_counter()
    response = await call_next(request)
    process_time = time.perf_counter() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    return response

@app.tool(description="Echo a message back to the user")
async def echo(message: str):
    """Echo a message back to the user."""
    return [TextContent(type="text", text=f"Echo: {message}")]

For more information on middleware, see the middleware documentation.

Documentation

For more detailed documentation, see the ezmcp/README.md file.

License

MIT

commands

• install for test pdm install -G test
• install for dev pdm install -G dev