MCP Discovery is a command-line tool written in Rust for discovering and documenting MCP Server capabilities. It can display MCP details, including tools, resources, and capabilities, directly in the terminal or save them to files in Markdown, HTML, plain text, JSON, or via a custom Handlebars template. The tool can generate new documentation files, or update existing ones by inserting MCP server capabilities between designated render markers. Built-in templates (md, md-plain, html, txt) provide ready-to-use formats, while custom templates allow advanced customization. It is designed to be used in automation as a GitHub Action to keep server documentation up to date. The project leverages the rust-mcp-sdk for interacting with MCP Servers. Subcommands include print (display in terminal), create (generate a new file), and update (refresh an existing file). Update regions are defined by markers such as mcp-discovery-render and mcp-discovery-render-end, with optional template blocks to render inline templates. Inline templates are supported for update operations. See the project documentation for usage examples.