MCP Skills Support #3579

• As required by the Code of Conduct, the description, docs, and comments (words meant for humans) are written by a human, not by an LLM.

Overview

Should we add support for the MCP Skills extension? The extension was accepted in SEP-2640. Clients should be able to browse skills on external MCP servers and fetch files through the gateway as they need them.

What I'd Like To See

• Let clients discover Skills support, browse a server's catalog and look up a skill directly by URI.
• Pass through the server's pagination and metadata so clients can browse without downloading everything and verify files as they fetch them.
• Piggyback on existing MCP authentication until there's a use case for something more.
• Let users browse skills and inspect their metadata and files in the MCP Playground, with requests visible to operators alongside other MCP traffic.

Scope

This would be a read-only passthrough with no aggregation. Each server keeps its own catalog and files, and agentgateway forwards requests to the server the client selects.

Related Work

In #3094 and #2254, maintainers suggested keeping registry work in other projects.

This project uses the Rust MCP SDK, which also has Skills support in progress. We may be able to reuse that work.