fix(ag-ui): isolate child reasoning with real HTTP lifecycle coverage - #1161
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blove
enabled auto-merge (squash)
September 24, 2026 20:35
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Attributed AG-UI reasoning events currently enter the parent reducer, so a child can contaminate the parent transcript and replace its reasoning timer. Route child reasoning into the existing child message projection, preserving its answer and tool links. Reject inactive, foreign, settled and terminal-child events before changing ownership; reasoning END remains inert.
Retain seven real HTTP/SSE regressions through the locked HttpAgent and actual adapter: successful completion, incomplete stream closure, server error, physical stop/dispose cancellation, sequential run isolation, and parent/two-child reasoning. These verify terminal evidence and physical connection closure rather than treating a resolved SDK promise as success.
Validation:
Wire coverage uses distinct message IDs: the locked SDK rejects simultaneous same-ID reasoning across lanes before adapter reduction. Same-ID reducer/callback tests establish decoded-source isolation. This change adds no public API, dependency upgrade or release and does not claim neutral AG-UI package or production React UI parity.