MCP Spec-Revision Compliance Scorer & Stateless Migration Advisor

The MCP spec is date-versioned and the 2026-07-28 release candidate is the largest, most breaking revision since launch — it removes the initialize handshake and protocol sessions entirely. Pick a target revision, answer a short capability questionnaire for a rubric compliance score, then run the migration advisor to see exactly what breaks on the way to the stateless core.

⚠ The 2026-07-28 revision is a release candidate (final ships 2026-07-28), not settled law — build against it cautiously. Rules here reflect the published changelogs. Re-verify against modelcontextprotocol.io.

MCP 2025-11-25 2026-07-28 RC Zero PII Client-Side · No Network

Scope & reliance — 🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only. A rubric over your self-reported posture, not an automated inspection of a live server. Deterministic · zero PII · CC BY 4.0.

▸ Score against a target revision

Target revision

▸ What breaks moving to the 2026-07-28 stateless core

Answer for your current server. The advisor flags every breaking change you will hit and the recommended replacement.