Model Context Protocol (2026 revision)

A dated reading of what is claimed, reported, and independently verified in the current evidence.

Current reading

The readiness gap, in one scan

AI-assisted assembly · derived results

Evidence strength Strong

Decision

Human editorial judgment · 2026-06-28

Proceed with caution

Why: The direction (stateless, scalable, hardened OAuth, formal deprecation with 12-month windows) is mature and aligned with how we already run MCP, but the RC carries real breaking changes (session removal, error-code change, mandatory headers, Tasks redesign) and is not yet final — adopt the patterns, defer the version pin.
Next: Audit our MCP servers for reliance on the initialize handshake, Mcp-Session-Id, the -32002 error code, and Roots/Sampling/Logging; design new servers stateless-first now (read protocol version/capabilities from _meta, emit Mcp-Method/Mcp-Name) but pin to the 2025-11-25 spec for production until the 2026-07-28 final ships and Tier-1 SDKs validate. Re-test after the ten-week window.

Constraints

No named blocker is present in the current public projection.

Evidence summary

AI-assisted assembly

Counts and dates only. Raw signals, private excerpts, trust records, and internal corpus material are not published here.

Publication record

Initial public reading

This is the initial public reading. No earlier readiness change is recorded.