feat(ag-ui): consume the protocol's SUBAGENT_* events and subagentRunId attribution - #955
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…on routing Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…nId-attributed content Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…ken map churn Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
First PR of the runtime-subagents arc (spec: docs/superpowers/specs/2026-09-01-runtime-subagents-design.md, plans on blove/runtime-subagents-arc).
SUBAGENT_STARTED/SUBAGENT_FINISHED/SUBAGENT_ERROR(@ag-ui/core0.0.59), normalized into the existingactivityType: 'subagent'ActivityEntry shape — thesubagents()projection needed zero changes.subagentRunId(TEXT_MESSAGE_*,TOOL_CALL_*) route into the child's card and never into the parent transcript — the same structural rule the LangGraph adapter applies to namespaced events. Events arriving before theirSUBAGENT_STARTEDcreate the entry (buffer-not-drop); a late STARTED regenerates the entry identity so cached projection wrappers pick up the real name/parentToolCallId.running(the run resumes with the same id; interrupts flow through the interrupt signal). Content-only updates flow through the entry's inner signal with no per-token map churn, matching the ACTIVITY_DELTA idiom.activityType: 'subagent'ACTIVITY path untouched (back-compat verified by the existing cockpit/ag-ui/subagents e2e).Per-runtime backend emitters (Strands, MAF, Mastra) land in follow-up PRs.
Testing
nx test ag-ui: 13 files / 241 tests green (10 new reducer specs incl. resume-cycle + buffer-not-drop generation change, 2 new projection tests, 1 transcript replay).nx lint ag-ui: 0 errors;nx build ag-ui: green.🤖 Generated with Claude Code