Implement SEP-1649: MCP Server Cards (.well-known Discovery)

[felixweinberger]

This is a tracking issue for implementation of SEP-1649.

Summary

This SEP introduces a standardized mechanism for MCP servers to advertise their capabilities and identity through .well-known URLs following established internet standards for service discovery. The Rust SDK needs to implement support for publishing capability documents at standardized .well-known paths describing available tools, resources, and prompts, enable clients to fetch these documents via HTTP without establishing a full MCP session, and provide utilities for both server-side capability document generation and client-side capability document fetching and parsing to enable better server discovery and selection UX.

Related Issues & PRs

• Implementation PRs: n/a
• Related PRs: n/a
• Related Issues: n/a

[tanish111]

@jokemanfire @alexhancock can i take this one?

[alexhancock]

@tanish111 Yeah go for it

[tanish111]

@alexhancock the SEP is still under review I am not sure I should work on it or wait for it to be accepted?