2.3.79 Satellite MCP Inspector

MCP Inspector

Handle: mcp-inspector
URL: http://localhost:34781

MCP Inspector is an interactive developer tool for testing and debugging Model Context Protocol (MCP) servers. It provides a web UI to connect to any MCP server, browse its tools and resources, and issue test calls.

---

Starting

# Start MCP Inspector
harbor up mcp-inspector

# Open in browser
harbor open mcp-inspector

MCP Inspector exposes two ports:

• 34781 — the web UI
• 34782 — the MCP proxy/client API

Usage

After starting the service, open the web UI at http://localhost:34781. From there you can:

• Connect to any MCP server running inside Harbor by entering its internal URL
• Browse available tools and resources
• Issue test calls and inspect responses

The proxy requires a per-boot session token. Grab the pre-authenticated URL (or the token itself) from the container logs and open it, adjusting the port to the Harbor-published one:

docker logs harbor.mcp-inspector 2>&1 | grep MCP_PROXY_AUTH_TOKEN

You can also launch MCP Inspector without a persistent container via the harbor mcp command:

# Run MCP Inspector as a one-shot tool (no persistent service)
harbor mcp inspector

Configuration

harbor config ls | grep HARBOR_MCP_INSPECTOR

# Port on the host where the MCP Inspector web UI is exposed
HARBOR_MCP_INSPECTOR_HOST_PORT         34781
# Port on the host where the MCP Inspector client API is exposed
HARBOR_MCP_INSPECTOR_CLIENT_HOST_PORT  34782

See Harbor's environment configuration guide to set arbitrary environment variables for the service.

Related Services

• MetaMCP — MCP aggregator and management server
• MCPO — OpenAPI-to-MCP proxy
• MCP Forge — visual MCP server builder