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[ARTICLE · art-78240] src=asdecided.com ↗ pub= topic=developer-tools verified=true sentiment=· neutral

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

AsDecided now supports MCP 2026-07-28, delivering a new stateless lifecycle for current hosts while retaining compatibility with initialize-based clients through MCP 2025-11-25. The update includes server/discover, per-request protocol metadata, standard MCP HTTP routing headers, explicit result types, cache hints, and JSON Schema 2020-12-compatible tool schemas, governed internally via ADR-121.

read1 min views1 publishedJul 29, 2026
MCP 2026-07-28 support in 14hrs while retaining legacy compatability
Image: source

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.

source & further reading
asdecided.com — original article
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