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langchain-mcp-tools-py-usage

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Created 1/14/2025byhideya

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langchainmcpmcp-clientmodelcontextprotocolpythontool-calling

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Python

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Simple MCP Client Using LangChain / Python License: MIT

This simple Model Context Protocol (MCP) client demonstrates the use of MCP server tools by LangChain ReAct Agent.

It leverages a utility function convert_mcp_to_langchain_tools() from langchain_mcp_tools.
This function handles parallel initialization of specified multiple MCP servers and converts their available tools into a list of LangChain-compatible tools (List[BaseTool]).

Anthropic's claude-3-5-sonnet-latest is used as the LLM. For convenience, code for OpenAI's gpt-4o is also included and commented out.

A bit more realistic (conversational) MCP Client is available here

A typescript equivalent of this MCP client is available here

Prerequisites

  • Python 3.11+
  • [optional] uv (uvx) installed to run Python package-based MCP servers
  • [optional] npm 7+ (npx) to run Node.js package-based MCP servers
  • API key from Anthropic (or OpenAI)

Usage

  1. Install dependencies:

    make install

  2. Setup API key:

    cp .env.template .env
    • Update .env as needed.
    • .gitignore is configured to ignore .env to prevent accidental commits of the credentials.

  3. Run the app:

make start

It takes a while on the first run.

Last updated: 4/12/2025

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hideya

hideya
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