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MCP Inspector

@modelcontextprotocol

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MCP Inspector について

Visual testing tool for MCP servers

基本情報

カテゴリ

開発者ツール

ライセンス

NOASSERTION

ランタイム

node

トランスポート

stdio

公開者

modelcontextprotocol

設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "inspector": {
      "command": "npx",
      "args": [
        "@modelcontextprotocol/inspector"
      ]
    }
  }
}

ツール

ツールは検出されませんでした

ツールは README から自動的に抽出されます。メンテナーは ## Tools という見出しの下に記載することで、このタブに反映できます。

概要

What is MCP Inspector?

MCP Inspector is a developer tool for testing and debugging MCP servers. It consists of a React-based web UI (MCPI) that connects to MCP servers via a Node.js proxy (MCPP) supporting stdio, SSE, and streamable-http transports. It is intended for developers building or debugging MCP server implementations.

How to use MCP Inspector?

Run npx @modelcontextprotocol/inspector to start the UI at http://localhost:6274. To inspect a server from its repository, use npx @modelcontextprotocol/inspector node build/index.js with optional arguments and -e flags for environment variables. A Docker image is also available. Ports can be customized via CLIENT_PORT and SERVER_PORT environment variables.

Key features of MCP Inspector

  • Interactive web UI for testing MCP servers
  • Supports stdio, SSE, and streamable-http transports
  • Bearer token authentication with session tokens
  • Export server launch configurations as mcp.json
  • Real-time adjustable timeout settings
  • Persists configuration across sessions

Use cases of MCP Inspector

  • Debugging MCP server implementations during development
  • Testing server tools and resources interactively
  • Validating server configuration for different transport protocols
  • Exporting server configurations for use in clients like Cursor or Claude Code

FAQ from MCP Inspector

Is MCP Inspector a network proxy for intercepting traffic?

No, it functions as both an MCP client and an HTTP server, enabling browser-based interaction with MCP servers via different transport protocols.

What are the runtime requirements?

Node.js version ^22.7.5 is required.

How does authentication work?

The proxy requires a session token (randomly generated) sent as a Bearer token in the Authorization header. The token is shown in the console and can be pre-filled in the UI.

Can I expose the inspector to other devices?

By default it binds only to localhost. Binding to all interfaces (HOST=0.0.0.0) is possible but dangerous because the proxy can spawn local processes.

What transport protocols does the inspector support?

It supports stdio, SSE (Server-Sent Events), and streamable-http transports.

コメント

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