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Commit87e0133

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MCP server to run Python code in a sandbox (pydantic#1140)
1 parent80d5c07 commit87e0133

22 files changed

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-6
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‎.github/workflows/ci.yml

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-name:Install dependencies
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run:uv sync --all-extras --all-packages --group lint
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-uses:actions/setup-node@v4
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-run:npm install
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working-directory:mcp-run-python
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-uses:pre-commit/action@v3.0.0
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with:
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extra_args:--all-files --verbose
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-run:uv run coverage report --fail-under 95
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-run:uv run diff-cover coverage.xml --fail-under 100
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test-mcp-run-python:
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runs-on:ubuntu-latest
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timeout-minutes:5
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env:
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UV_PYTHON:"3.12"
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steps:
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-uses:actions/checkout@v4
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-uses:astral-sh/setup-uv@v5
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with:
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enable-cache:true
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-uses:actions/setup-node@v4
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-run:npm install
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working-directory:mcp-run-python
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-run:npm run lint
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working-directory:mcp-run-python
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-run:npm run prepare
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working-directory:mcp-run-python
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-run:uv run --package mcp-run-python pytest mcp-run-python -v
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# check npx works
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-run:npx . warmup
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working-directory:mcp-run-python
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# https://github.com/marketplace/actions/alls-green#why used for branch protection checks
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check:
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if:always()
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needs:[lint, mypy, docs, test-live, test, coverage]
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needs:[lint, mypy, docs, test-live, test, coverage, test-mcp-run-python]
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runs-on:ubuntu-latest
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steps:

‎.pre-commit-config.yaml

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types:[python]
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language:system
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pass_filenames:false
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-id:lint-js
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name:Lint JS
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entry:make
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args:[lint-js]
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language:system
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types_or:[javascript, ts, json]
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files:'^mcp-run-python/'
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pass_filenames:false
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-id:typecheck
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name:Typecheck
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entry:make

‎Makefile

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uv run ruff format --check
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uv run ruff check
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.PHONY: lint-js
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lint-js:## Lint JS and TS code
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cd mcp-run-python&& npm run lint
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.PHONY: typecheck-pyright
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typecheck-pyright:
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@# PYRIGHT_PYTHON_IGNORE_WARNINGS avoids the overhead of making a request to github on every invocation
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@echo"building coverage html"
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@uv run coverage html
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.PHONY: test-mrp
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test-mrp:## Build and tests of mcp-run-python
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cd mcp-run-python&& npm run prepare
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uv run --package mcp-run-python pytest mcp-run-python -v
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.PHONY: update-examples
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update-examples:## Update documentation examples
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uv run -m pytest --update-examples tests/test_examples.py

‎mcp-run-python/.prettierignore

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node_modules/
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dist/

‎mcp-run-python/README.md

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#MCP Run Python
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[Model Context Protocol](https://modelcontextprotocol.io/) server to run Python code in a sandbox.
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The code is executed using[pyodide](https://pyodide.org) in node and is therefore isolated from
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the rest of the operating system.
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The server can be run with just npx thus:
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```bash
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npx @pydantic/mcp-run-python [stdio|sse]
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```
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where:
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-`stdio` runs the server with the[Stdio MCP transport](https://modelcontextprotocol.io/docs/concepts/transports#standard-input%2Foutput-stdio) — suitable for running the process as a subprocess locally
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- and`sse` runs the server with the[SSE MCP transport](https://modelcontextprotocol.io/docs/concepts/transports#server-sent-events-sse) — running the server as an HTTP server to connect locally or remotely

‎mcp-run-python/cli.js

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#!/usr/bin/env node
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const{ main}=require('./dist/index.js')
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main()

‎mcp-run-python/eslint.config.mjs

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importeslintfrom'@eslint/js'
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importtseslintfrom'typescript-eslint'
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exportdefaulttseslint.config(eslint.configs.recommended,tseslint.configs.recommended)

‎mcp-run-python/inline_python.js

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// build dist/prepareEnvCode.js from src/prepare_env.py
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constfs=require('fs')
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constpath=require('path')
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constsrc=path.resolve(__dirname,'src/prepare_env.py')
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constdst=path.resolve(__dirname,'dist/prepareEnvCode.js')
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constpythonCode=fs.readFileSync(src,'utf8').replace(/\\n/g,'\\\\n')
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constjsCode=`// DO NOT EDIT THIS FILE DIRECTLY, INSTEAD RUN "npm run build"
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.preparePythonCode = \`${pythonCode}\`
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`
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fs.writeFileSync(dst,jsCode,'utf8')

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