MCP Inspector changeddocs/2026-07-28/tools/inspector

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55The [MCP Inspector](https://github.com/modelcontextprotocol/inspector) is the reference developer tool for testing and debugging [MCP servers](/docs/2026-07-28/learn/server-concepts). It ships as a single package, `@modelcontextprotocol/inspector`, providing **three clients behind one binary**:

7| Client | Invocation | What it's for |

8| ------- | ------------------------------------------- | --------------------------------------------------------------------------------- |

9| **Web** | `npx @modelcontextprotocol/inspector` | A full graphical inspector in the browser. The default, and the richest surface. |

7| Client | Invocation | What it's for |

8| - | - | - |

9| **Web** | `npx @modelcontextprotocol/inspector` | A full graphical inspector in the browser. The default, and the richest surface. |

1010| **CLI** | `npx @modelcontextprotocol/inspector --cli` | A scriptable, machine-readable client for CI, shell pipelines, and coding agents. |

11| **TUI** | `npx @modelcontextprotocol/inspector --tui` | An interactive terminal UI, for when a browser isn't available or wanted. |

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1313All three are built on the same shared core, so a connection behaves identically across them: the same transports, the same configuration files, the same OAuth state on disk, and the same [protocol-era](/docs/2026-07-28/tools/inspector/protocol-eras) negotiation (legacy vs. modern 2026-07-28).

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