langchain-mcp-tools-py-usage

Name: langchain-mcp-tools-py-usage
Author: hideya

by hideya 7 stars hideya/langchain-mcp-tools-py-usage

Simple MCP Client Using LangChain / Python

View on GitHub

READMEmain

MCP Tools Usage From LangChain / Example in Python

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]).

OpenAI's gpt-5.4-mini is used as the LLM. For convenience, code for Anthropic's, Google GenAI's and xAI's LLMs are 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
LLM API keys from OpenAI, Anthropic, Google GenAI, and/or xAI as needed

Usage

Install dependencies:
```
make install
```
Setup API key:
```
cp .env.template .env
```
- Update .env as needed.
- .gitignore is configured to ignore .env to prevent accidental commits of the credentials.
Run the app:
```
make start
```
It takes a while on the first run.

License

MIT

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