Current MCP,without breaking the old one.
AsDecided now supports MCP 2026-07-28. Current hosts get the new stateless lifecycle; initialize-based clients keep working.
What shipped
server/discoverand per-request protocol metadata- standard MCP HTTP routing headers and error responses
- explicit result types and cache hints
- JSON Schema 2020-12-compatible tool schemas
- frozen compatibility through MCP 2025-11-25
The change was governed inside AsDecided itself through ADR-121, a linked requirement, a wire-contract design, and executable verification paths.