MCP Js vs MCP Safe Local Python Executor

In-depth architectural comparison of the MCP Js and MCP Safe Local Python Executor MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose MCP Js when:

• You need dedicated capabilities in the Code Execution domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: API Key required (Free / Open Source).
• You have access to required keys: MCP_V8_CONFIG.
• Primary tools included: run_js, get_execution, get_execution_output.

Explore MCP Js Details

Choose MCP Safe Local Python Executor when:

• You need dedicated capabilities in the Code Execution domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Exposes a run_python MCP tool, Uses Smolagents LocalPythonExecutor, Runs locally over stdio with uv.

Feature & Specification Comparison

Specification	MCP Js r33drichards Code Execution	MCP Safe Local Python Executor maxim-saplin Code Execution
Summary	A Javascript code execution sandbox that uses v8 to isolate code to run AI generated javascript locally without fear. Supports heap snapshotting for persistent sessions.	Safe Python interpreter based on HF Smolagents LocalPythonExecutor
Category & Scope	Code Execution

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "r33drichards-mcp-js": {
      "url": "http://localhost:8080/mcp"
    }
  }
}

{
  "mcpServers": {
    "maxim-saplin-mcp-safe-local-python-executor": {
      "command": "uvx",
      "args": [
        "maxim-saplin-mcp-safe-local-python-executor"
      ]
    }
  }
}

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