Reusable worker sessions: close_agent / resume_agent (CL-6943) - #618
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Worker sessions from spawn_agent no longer tear down on a clean completion — they stay open and retained until close_agent runs. close_agent(target) permanently closes a session (descendants first, bounded by a ~30s deadline per session so a wedged descendant cannot hang the call); resume_agent(id) reopens a retained, completed session. A new AgentLifecycleStatus enum (pending_init/running/interrupted/ completed/shutdown/not_found) tracks this independent of the existing TUI display status, and a retained session is exempt from the finished-session display cap until it is actually closed. interrupt_agent and followup_task are a separate, later change.
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) Worker sessions from spawn_agent no longer tear down on a clean completion — they stay open and retained until close_agent runs. close_agent(target) permanently closes a session (descendants first, bounded by a ~30s deadline per session so a wedged descendant cannot hang the call); resume_agent(id) reopens a retained, completed session. A new AgentLifecycleStatus enum (pending_init/running/interrupted/ completed/shutdown/not_found) tracks this independent of the existing TUI display status, and a retained session is exempt from the finished-session display cap until it is actually closed. interrupt_agent and followup_task are a separate, later change.
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) Worker sessions from spawn_agent no longer tear down on a clean completion — they stay open and retained until close_agent runs. close_agent(target) permanently closes a session (descendants first, bounded by a ~30s deadline per session so a wedged descendant cannot hang the call); resume_agent(id) reopens a retained, completed session. A new AgentLifecycleStatus enum (pending_init/running/interrupted/ completed/shutdown/not_found) tracks this independent of the existing TUI display status, and a retained session is exempt from the finished-session display cap until it is actually closed. interrupt_agent and followup_task are a separate, later change.
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Summary
close_agent(target): permanently closes a session, descendants closed first, each bounded by a ~30s cleanup deadline so a wedged descendant cannot hang the call.resume_agent(id): reopens a retained, completed session so it is addressable again (no prompt argument — actually pushing new input isinterrupt_agent/followup_task, a separate later change).AgentLifecycleStatus(pending_init | running | interrupted | completed | shutdown | not_found), tracked alongside the existing TUI display status onSubAgentSession.DEFAULT_MAX_COMPLETED = 20) untilclose_agentactually shuts it down.Out of scope (separate lane):
interrupt_agent,followup_task.close_agent/resume_agentwere already reserved inFLEET_VERBS/gated viaassertTierMayMountFleetVerb; leaves cannot mount either.Teardown notes
close()in the vendored agent package setsclosed = truebefore teardown completes and releases its lock last — a failed/wedged close can leave a workdir lock held. Bounding the cleanup deadline here does not fix that (known issue, CL-6984); it only stops a wedged descendant from hanging the caller'sclose_agentcall.Test plan
bun test src/subagent/session-store.test.ts src/subagent/lifecycle-tools.test.ts src/subagent/authority.test.ts src/subagent/agent-fleet.test.ts src/subagent/run-authority.test.tsbun run check(lint/typecheck/build/test) — full suite green except one pre-existing timing-flaky test (tool execution watchdog > stale resume after a forced ceiling resume does not unfreeze a newer pause), unrelated to this change and passes on its own in isolation.scripts/verify-corbits-only-scope.sh