feat(runtimes): mastra subagent delegation demo with SUBAGENT_* injection in the bridge - #958
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
… injection in the bridge Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…leted expanded body Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Fourth PR of the runtime-subagents arc (adapter #955, Strands #956, MAF #957).
weather_forecastersub-agent via Mastra 1.63.2'sagentsconfig (the sub-agents system; the deprecated AgentNetwork path untouched).deployments/ag-ui-mastra/subagent-emitter.mjsis a pure per-run injector in our hand-written bridge's translation loop:agent--prefixedTOOL_CALL_START→SUBAGENT_STARTED(subagentRunId<tid>-sub, parentToolCallId = the LLM tool-call id, stable across all frames); the matchingTOOL_CALL_RESULT→ one attributedTEXT_MESSAGEcarrying the child's final text +SUBAGENT_FINISHED(SUBAGENT_ERRORon failure-shaped results); pending delegations swept exactly once at run terminals.tool-outputchunks — 82 in the capture) but@ag-ui/mastradrops them (case "tool-output": break), and the bridge buffers the whole delegation burst until it resolves, so the card mounts effectively complete. All measured and documented incockpit/runtimes/mastra/angular/docs/wire-capture-subagents.md(spike capture, post-emitter capture, browser verification + screenshot).Testing
node --test— 8 new injector tests: exact ordering field-for-field, error-result shapes, passthrough, unmatched result, terminal sweep idempotence).🤖 Generated with Claude Code