MCP Server Card

Discover A Server Card is a proposed static, discoverable document that describes an MCP server: what it is, who publishes it, and how to reach it, without requiring a client to first open an MCP session. The mechanism is defined in SEP-2127, a Model Context Protocol enhancement proposal opened 21 January 2026 and still being updated as of 3 September 2026, which recommends serving the card at a /server-card path relative to the server's own endpoint rather than at a single global well-known location such as /.well-known/mcp; an earlier well-known-path proposal (SEP-1649) was superseded. Static cards intentionally omit the live list of tools, prompts and resources, which a client still has to fetch at runtime. Server cards can be advertised to an ARD registry with the media type application/mcp-server-card+json. As of the SEP's own text, implementation is limited to experimental SDK work and a demo; mainstream client auto-discovery of server cards is not established. Used by: mcp, ard.