feat(ag-ui): preserve streamed messages through snapshot reconciliation - #1166
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blove
enabled auto-merge (squash)
September 24, 2026 23:24
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AG-UI's private runtime can own protocol data but cannot yet accumulate streaming messages and reconcile an authoritative snapshot without losing omitted reasoning or corrected message fields.
Add two pure, private transformations: six normalized text/reasoning events build owned message records, and snapshots replace matching IDs while preserving established positions and event-only reasoning/activity when their role is omitted. Changed records capture complete portable data; unchanged records retain references. Metadata-only chunks are applied, incoming metadata is owned before the SDK's shallow merge, and invalid or duplicate targets fail atomically. A removed open target cannot silently receive later content or turn a callback failure into success.
Validation:
Snapshot replacement preserves retained positions rather than promising backend reorder; an empty snapshot preserves event-only roles. This does not expose a public session, implement tool execution or establish full AG-UI/React parity. Caller admission, child routing, state and other protocol families remain separate work. No dependency, public export, argument-schema, release or publication changes.