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Health check endpoint

When you use the SSE (-t sse) or streamable HTTP (-t streamable-http) transport, the MCP server exposes a health check at /healthz. Load balancers, monitoring, and orchestration can use it to verify that the server is running and accepting connections.

What you’ll achieve

You can probe readiness from scripts or upstream checks when the server uses an HTTP transport.

Before you begin

  • The server running with -t sse or -t streamable-http (not stdio).

Send a health check request

Endpoint: GET /healthz

Response:

  • Status code: 200 OK
  • Body: ok

Examples:

Bash 
# For streamable HTTP or SSE transport with default listen address (localhost:8000)
curl http://localhost:8000/healthz

# With custom address
curl http://localhost:9090/healthz

Note: The health check endpoint is only available when using SSE or streamable HTTP transports. It is not available with the stdio transport (-t stdio), because stdio does not start an HTTP server.

Next steps