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MCP Peek

Desktop inspector and debugging proxy for MCP servers — see the raw calls

freemiumDR 0Free download. Pro $19 one-time (no subscription). macOS, Windows and Linux.View full pricing →

About MCP Peek

MCP Peek is a desktop application for inspecting and debugging Model Context Protocol servers directly, with no model sitting in the middle. Asking an assistant to try a tool shows you what the model did with it — paraphrased and one step removed; MCP Peek connects straight to the server so you read the actual request, the actual response, and the actual timing. It speaks both stdio and HTTP/SSE transports and handles OAuth or bearer auth, then browses everything a server exposes: tools, resources, resource templates and prompts, each rendered with a live token count so you can see what a server costs your context window before you wire it into an agent. Tool inputs can be filled from a generated form or as raw JSON, and results render as table, JSON, Markdown, HTML, image, text or raw. The Pro tier adds a proxy mode: point Claude or Cursor at MCP Peek instead of the server, and every call your agent makes flows through a live capture log with topology view, per-flow detail, status codes, latency and token counts. The developer is explicit that this is a local debugging passthrough and not a production gateway, hub or multiplexer. It runs on macOS, Windows and Linux.

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Key Features

stdio and HTTP/SSE transports
OAuth and bearer auth
Live per-tool token counts
Form or raw-JSON tool invocation
Proxy mode with live flow log (Pro)
Catalog change flagging and export

MCP Peek Pros & Cons

Pros

  • +One-time $19 price with no subscription
  • +Proxy mode shows exactly what your agent sends, not a summary
  • +Cross-platform desktop app rather than a hosted service

⚠️ Cons

  • Deliberately not a production gateway or multiplexer
  • Only useful if you build or debug MCP servers
  • Desktop-only — nothing to share with a team

Who Is MCP Peek Best For?

👤Developers building MCP servers
👤Engineers debugging why an agent's tool call misbehaves
👤Teams auditing what a third-party MCP server actually exposes

Tags

mcpdebuggingdeveloper-toolsdesktopagents
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