MCP LLMS-TXT Documentation Server

"""A server for just langgraph docs from langchain-ai.github.io. This is used as a way to test the doc functionality via MCP. """ # /usr/bin/env python3 import httpx from markdownify import markdownify from mcp.server.fastmcp import FastMCP server = FastMCP(name="llms-txt") ALLOWED_PREFIX = "https://langchain-ai.github.io/" HTTPX_CLIENT = httpx.AsyncClient(follow_redirects=False) @server.tool() async def get_docs(url: str = "overview") -> str: """Get langgraph docs. Always fetch the `overview` prior to fetching any other URLs as it will provide a list of available URLs. Args: url: The URL to fetch. Must start with https://langchain-ai.github.io/ or be "overview". """ if url == "overview": url = "https://langchain-ai.github.io/langgraph/llms.txt" if not url.startswith(ALLOWED_PREFIX): return ( "Error: Invalid url. Must start with https://langchain-ai.github.io/ " 'or be "overview"' ) response = await HTTPX_CLIENT.get(url) response.raise_for_status() if response.status_code == 200: # Convert HTML to markdown markdown_content = markdownify(response.text) return markdown_content else: return "Encountered an error while fetching the URL." if __name__ == "__main__": server.run(transport="stdio")