pip install mcp

brew install node  # or: apt install nodejs

python server.py

{
  "mcpServers": {
    "code-executor": {
      "command": "python",
      "args": ["/path/to/code-executor-mcp/server.py"]
    }
  }
}

Tool: execute_code
Input: {"code": "import math\nprint(f'Pi = {math.pi:.10f}')\nprint(f'e = {math.e:.10f}')", "language": "python"}
Output: {"output": "Pi = 3.1415926536\ne = 2.7182818285\n", "exit_code": 0, "elapsed_seconds": 0.045}

Tool: run_command
Input: {"command": "ls -la /tmp | head -20"}
Output: {"output": "total 128\ndrwxrwxrwt ...", "exit_code": 0, "elapsed_seconds": 0.012}

Tool: run_tests
Input: {"test_command": "python -m pytest tests/ -v", "working_dir": "/path/to/project"}
Output: {"passed": true, "summary": "12 passed in 1.34s", "exit_code": 0}

Tool: run_command
Input: {"command": "rm -rf /"}
Output: {"error": "Command blocked by safety filter (matches: rm\\s+-rf\\s+/)"}