# A2UI Protocol <span class="version-badge stable">v0.9.1 — Current</span>

> Version 0.9.1 is the current production release. For the legacy version, see [v0.8 (Legacy)](v0.8-a2ui.md).

> NOTE: Living Document
>
> This specification is automatically included from `specification/v0_9_1/docs/a2ui_protocol.md`. Any updates to the specification will automatically appear here.

For more information, see the following related documentation:

- [v0.9 Protocol Specification](v0.9-a2ui.md) (Previous Stable).
- [Evolution Guide: v0.9 → v0.9.1](v0.9.1-evolution-guide.md).

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