MCP 2026-07-28 Specification (Stateless Core + Extensions)

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 Critical

Decision

Human editorial judgment · 2026-06-28

Proceed with caution

Why: Spec is officially final-dated and backed by the Linux Foundation/AAIF, but it is the biggest breaking revision yet and the stateless benefit has a documented streaming/subscription-state caveat, so adopt deliberately rather than racing the RC.
Next: Build a shadow branch targeting the RC: drop Mcp-Session-Id stickiness, add .well-known/oauth-protected-resource + per-request MCP-Protocol-Version, wire Mcp-Method routing, and run multi-instance round-robin tests before the 2026-07-28 cutover; keep current spec in prod until Tier-1 SDKs validate.

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.