MCP Run Python

Model Context Protocol server to run Python code in a sandbox.

The code is executed using Pyodide in Deno and is therefore isolated from the rest of the operating system.

See

The server can be run with deno installed using:

where:

• -N -R=node_modules -W=node_modules (alias of --allow-net --allow-read=node_modules --allow-write=node_modules) allows network access and read+write access to ./node_modules. These are required so pyodide can download and cache the Python standard library and packages

• --node-modules-dir=auto tells deno to use a local node_modules directory

• stdio runs the server with the Stdio MCP transport — suitable for running the process as a subprocess locally

• sse runs the server with the SSE MCP transport — running the server as an HTTP server to connect locally or remotely

• warmup will run a minimal Python script to download and cache the Python standard library. This is also useful to check the server is running correctly.

Here's an example of using @pydantic/mcp-run-python with PydanticAI: