agents-mcp

# MCP (Model Context Protocol) Use this skill to decide whether MCP is the right abstraction, configure existing servers in Claude Code or Codex, or build a narrow custom server when repeated agent workflows justify it. Protocol baseline: `https://modelcontextprotocol.io/specification/2025-11-25` (stable). The **2026-07-28 spec finalizes on 2026-07-28** (`blog.modelcontextprotocol.io/posts/2026-07-28-release-candidate`) — as of this writing that is under three weeks out; treat any new MCP work started now as needing a post-launch compatibility pass, not as a distant future concern. The RC is a fundamental redesign, not an increment: the protocol becomes stateless (the `initialize`/`notifications/initialized` handshake and `Mcp-Session-Id` header are removed, replaced by per-request `_meta` fields and a mandatory `server/discover` RPC), Roots/Sampling/Logging are deprecated outright (not just folded into MRTR — migrate to tool-parameter directories, direct provider API calls, and stderr/OTel logging respectively), and Elicitation moves to the Multi Round-Trip Requests (MRTR) pattern. TypeScript SDK v2 (beta as of 2026-07) targets this spec and ships stable alongside it; v1.x stays the supported production lane for at least 6 months after v2 stabilizes. Build to the stable `2025-11-25` spec today; plan a scoped migration window once `2026-07-28` finalizes rather than pre-adopting RC shapes in production. Governance (factor into vendor-trust judgment, not just the tech): Anth...