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You can connect to the MCPs running inside the sandbox both from outside and inside the sandbox.

From outside the sandbox

To connect to the MCPs running inside the sandbox, use the sandbox.getMcpUrl() in JavaScript and sandbox.get_mcp_url() in Python.

From inside the sandbox

If you need to access the MCP gateway from within the sandbox itself, it’s available at:
You’ll need to include the Authorization header with the MCP token when making requests from inside the sandbox. How that is added depends on the MCP client you use:

Claude

OpenAI Agents

Official MCP client

This list is not exhaustive. You can find more examples in the E2B Cookbook.

Debugging with MCP Inspector

The MCP Inspector is a useful tool for debugging and testing your MCP server setup. Get the command to run:
Run the command in your terminal. This will open a web interface where you can:
  • Browse available tools
  • Test tool calls with different parameters
  • Inspect request/response payloads
  • Debug connection issues