feat(core): subagent registry + useSubagent hook#5873
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Track subagent lifecycle (SUBAGENT_STARTED/FINISHED/ERROR) per owning agent
in a new SubagentRegistry delegate on CopilotKitCore, exposed via
getSubagents(agentId) and an onSubagentsChanged subscription. Add a
useSubagent({ subagentId | subagentName, agentId? }) hook to resolve a
message's subagentId to a name, description, and running status, warning
once (dev) when a subagentName is ambiguous.
Requires @ag-ui/client + @ag-ui/core >= 0.0.58; bumps the pins accordingly.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Draft. Adds subagent lifecycle tracking to CopilotKit core and a
useSubagenthook.SubagentRegistrydelegate onCopilotKitCore— tracksSUBAGENT_STARTED/FINISHED/ERRORper owning agent (modeled onSuggestionEngine; owns its own per-agentagent.subscribelikeStateManager). Exposed viagetSubagents(agentId)+ anonSubagentsChangedsubscription.useSubagent({ subagentId | subagentName, agentId? })(react-core v2) — resolves a message'ssubagentIdto a friendlyname,description, and runningstatus. Warns once (dev) when asubagentNameis ambiguous.Dependency: consumed via pkg.pr.new (no @Ag-ui release needed)
Requires the AG-UI subagent event schemas +
AgentSubscribercallbacks from ag-ui PR ag-ui-protocol/ag-ui#2137. Rather than wait for a published@ag-ui0.0.58, the feature packages point@ag-ui/client/@ag-ui/coreat that PR's pkg.pr.new preview (https://pkg.pr.new/ag-ui-protocol/ag-ui/@ag-ui/*@2137).@copilotkit/corebuilds against it anduse-subagent.tsxtypechecks clean.Reviewer notes:
.npmrcsetsblock-exotic-subdeps=false— required because pkg.pr.new packages carry url inter-deps (@ag-ui/client → @ag-ui/encoder). Flag if a different consumption path is preferred.@ag-ui0.0.58 to resolve to the same preview — pre-existing migration state on the branch, not introduced here.@ag-uipublishes.🤖 Generated with Claude Code