🔗 lc2mcp - Convert LangChain tools to FastMCP in one line

[xiaotonng]

Hi! 👋

I created lc2mcp - a lightweight adapter that converts LangChain tools to FastMCP tools in one line of code.

from langchain_core.tools import tool
from fastmcp import FastMCP
from lc2mcp import register_tools

@tool
def get_weather(city: str) -> str:
    """Get weather for a city."""
    return f"Sunny in {city}"

mcp = FastMCP("weather-server")
register_tools(mcp, [get_weather])  # That's it!

This unlocks 1000+ LangChain community tools (DuckDuckGo, Wikipedia, SQL, APIs...) for FastMCP users.

✨ Features

Feature	Description
🔄 Instant Conversion	One function call to convert any LangChain tool
📦 Ecosystem Access	Unlock 1000+ LangChain community tools
🔐 Context Injection	Pass auth, user info, and request context
📊 Progress & Logging	Full MCP progress notifications support
🏷️ Namespace Support	Prefix tool names and handle conflicts

📦 Installation

pip install lc2mcp

🔗 Links

• PyPI: https://pypi.org/project/lc2mcp/
• GitHub: https://github.com/xiaotonng/lc2mcp

Would love to hear your feedback! 🙏