# MCP 2026-07-28 support in 14hrs while retaining legacy compatability

> Source: <https://asdecided.com/changelog/v0.25.0>
> Published: 2026-07-29 07:28:29+00:00

# 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/discover`

and 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.