Python Runner MCP Server

Python Runner MCP Server

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A Python code execution server based on the FastMCP framework, designed specifically for data science and machine learning workflows.

🚀 Features

• Safe Python Code Execution: Execute Python code in isolated namespaces
• Rich Data Science Libraries: Pre-installed with commonly used data science and machine learning packages
• Real-time Output Capture: Capture standard output, error output, and return values
• MCP Protocol Support: Fully compatible with Model Context Protocol
• Easy to Use: Provides a simple and clean API interface

⚡ Quick Start (Recommended)

Use uvx to run the server directly without installation: [TODO ..... ]

# Run directly (no pre-installation required)
uvx python-runner

Configure in Claude Desktop

Add the following configuration to your Claude Desktop config file:

{
  "mcpServers": {
    "python-runner": {
      "command": "uvx",
      "args": ["python-runner"]
    }
  }
}

Config file locations:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Debug and Test

# Use MCP Inspector to debug the server
npx @modelcontextprotocol/inspector uvx python-runner

📦 Pre-installed Libraries

This project comes pre-installed with the following commonly used data science and machine learning libraries:

• Data Processing: numpy, pandas, scipy
• Machine Learning: scikit-learn
• Data Visualization: matplotlib, seaborn, plotly
• Scientific Computing: sympy
• Image Processing: pillow
• Network Analysis: networkx
• Interactive Development: jupyter
• HTTP Requests: requests

🛠️ Manual Installation (For Development)

Prerequisites

• Python 3.12 or higher
• uv package manager (recommended) or pip

Install with uv (Recommended)

# Clone the repository
git clone <repository-url>
cd python_runner

# Install dependencies
uv sync

Install with pip

# Clone the repository
git clone <repository-url>
cd python_runner

# Create virtual environment
python -m venv venv
source venv/bin/activate  # Windows: venv\Scripts\activate

# Install dependencies
pip install -e .

🚀 Usage

Using with Claude Desktop

After configuration, you can directly use Python code execution functionality in Claude Desktop:

Please help me execute this Python code:

import pandas as pd
import numpy as np

# Create sample data
data = pd.DataFrame({
    'sales': [100, 150, 200, 120, 180],
    'profit': [20, 30, 50, 25, 40]
})

print("Sales data statistics:")
print(data.describe())

Running as Standalone MCP Server

# Using uvx (recommended)
uvx python-runner

# Or run locally
python main.py

Direct API Call

from main import execute_python

# Execute simple Python code
result = execute_python("""
print("Hello, World!")
x = 1 + 2
print(f"Result: {x}")
""")

print(result)
# Output:
# {
#     'output': 'Hello, World!\nResult: 3\n',
#     'error': '',
#     'success': True
# }

Data Science Examples

# Data analysis example
code = """
import pandas as pd
import numpy as np

# Create sample data
data = pd.DataFrame({
    'x': np.random.randn(100),
    'y': np.random.randn(100)
})

print(f"Data shape: {data.shape}")
print(f"Statistical summary:\n{data.describe()}")
"""

result = execute_python(code)
print(result['output'])

# Machine learning example
code = """
from sklearn.datasets import make_classification
from sklearn.model_selection import train_test_split
from sklearn.ensemble import RandomForestClassifier
from sklearn.metrics import accuracy_score

# Generate sample data
X, y = make_classification(n_samples=1000, n_features=20, random_state=42)
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)

# Train model
clf = RandomForestClassifier(random_state=42)
clf.fit(X_train, y_train)

# Predict and evaluate
y_pred = clf.predict(X_test)
accuracy = accuracy_score(y_test, y_pred)
print(f"Model accuracy: {accuracy:.4f}")
"""

result = execute_python(code)
print(result['output'])

📋 API Reference

execute_python(code: str) -> dict

Execute Python code and return the result.

Parameters:

• code (str): Python code string to execute

Returns:

• dict: Dictionary containing the following keys:
  • output (str): Standard output content
  • error (str): Error message (if any)
  • success (bool): Whether execution was successful

🔒 Security

• Code executes in isolated namespaces
• Captures and redirects standard output and error output
• Provides detailed error tracking information

⚠️ Warning: This tool executes arbitrary Python code. Please ensure you use it in a trusted environment.

🤝 Contributing

Issues and Pull Requests are welcome!

1. Fork this repository
2. Create a feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• FastMCP - Excellent MCP framework
• All maintainers of the pre-installed open-source data science libraries

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Made with ❤️ for the data science community