MCP Peek is a desktop application designed for developers to inspect, run, and proxy servers that use the Model Context Protocol (MCP), an open standard that allows AI clients to connect to external tools and data. The app provides a graphical user interface for browsing and debugging MCP servers, allowing users to view every exposed tool, resource, template, and prompt along with token cost estimates. It operates by connecting directly to a server, bypassing any intermediate AI models, so developers see the real request, response, and timing for each call. The application is available for macOS (Apple Silicon and Intel), Windows, and Linux. Key features of MCP Peek include the ability to connect to any MCP server, either as a local process over STDIO or as a remote HTTP endpoint with authentication methods such as bearer tokens, OAuth, or custom headers. It offers a proxy mode that sits between an AI client and the server, capturing all traffic including the full request, response, timing, and tokens. The app also provides a topology view for visualizing server connections and allows users to flag tools, resources, or prompts for changes and export a clean Markdown brief for coding agents. All connections, secrets, and results remain local, with API keys stored in the operating system keychain and analytics turned off by default. Typical use cases involve debugging and building MCP servers, where a developer points an AI client like Claude or Cursor at MCP Peek to watch the signal move and inspect every call without lossy paraphrasing. The workflow includes connecting to any server, browsing its catalog, running individual tools by hand, capturing live traffic through the proxy, and exporting review briefs. The free version of the app allows inspection of a single server, while a one time payment of 19 dollars unlocks unlimited servers, the proxy feature, review brief export, and unlimited saved input presets with no subscription required. The app does not function as a production gateway but as a local debugging passthrough.