Issue 21837: current-main runtime reproduction
Commit: 70e5e384dab96a1d1e4a253ee5a9415ed5d8ce30
Environment: Linux x86_64; real vp run dev web/server; Chromium browser 1280x800; isolated worktree home seeded with pruned real data.
Writer and checker: codex/gpt-6.1-sol, reasoningEffort=high, serviceTier=default.
Parent: codex/gpt-6-astra, medium; prompt entered through browser.
Steps: async writer retains ALPHA21837 and returns READY; exactly one queued follow-up sets BETA21837, launches async checker (sleep 40 then CHECK21837), returns INTERIM; writer automatically resumes and returns FINAL.

22:43:08 UTC read-only snapshot: original task completed READY; follow-up completed INTERIM; nested checker running.
Parent task_status while nested checker runs: completed/result_available, summary INTERIM, hasPendingChildRuns=false.
22:44:22 UTC final snapshot:
task node:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1 status=completed result=READY
task node:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Athread-send%3Aprobe21837-followup-1 status=completed result=INTERIM
task node:delegated-task:command%3Amcp%3Aecb355e7-4bdc-4f43-9476-5d0c17554760%3Adelegate-task%3Aprobe21837-nested-checker-1 status=completed result=CHECK21837
run run:thread:a9407133-8d3d-4331-861e-f02d915b88a1:ordinal:1 status=completed completedAt=2026-10-21T22:44:08.704Z delegatedTaskId=None
run run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:1 status=completed completedAt=2026-10-21T22:42:40.281Z delegatedTaskId=None
run run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:2 status=completed completedAt=2026-10-21T22:43:00.250Z delegatedTaskId=node:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Athread-send%3Aprobe21837-followup-1
run run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aecb355e7-4bdc-4f43-9476-5d0c17554760%253Adelegate-task%253Aprobe21837-nested-checker-1:ordinal:1 status=completed completedAt=2026-10-21T22:43:51.816Z delegatedTaskId=None
run run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:3 status=completed completedAt=2026-10-21T22:43:56.009Z delegatedTaskId=None

Parent-directed result transfers:
{"id": "context-transfer:type:subagent_result:source-thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:target-thread:a9407133-8d3d-4331-861e-f02d915b88a1:c31f8498-c6a4-41ec-a9c1-7c6547411c54", "type": "subagent_result", "sourceThreadId": "thread:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1", "targetThreadId": "a9407133-8d3d-4331-861e-f02d915b88a1", "sourcePoint": {"threadId": "thread:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1", "runId": "run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:1", "checkpointId": "checkpoint:scope:checkpoint-scope%3Athread%3Athread%253Adelegated-task%253Acommand%25253Amcp%25253Aabdec793-e0bd-47ce-a955-268ebe82f446%25253Adelegate-task%25253Aprobe21837-writer-1%3Aname%3Aroot:name:1", "turnItemId": "turn-item:provider:codex:native-item:msg_0419411eeb37437e016ad93fe0201081958697b947552f87ef", "providerThreadRef": {"driver": "codex", "nativeId": "01a160a1-73d3-7d30-8f9f-76941c4a8451", "strength": "strong"}, "providerTurnRef": {"driver": "codex", "nativeId": "01a160a1-7c03-7762-b43d-1d99a8bc4e56", "strength": "strong"}}, "basePoint": null, "sourceProviderInstanceId": "codex", "targetProviderInstanceId": "codex", "targetRunId": "run:thread:a9407133-8d3d-4331-861e-f02d915b88a1:ordinal:1", "status": "consumed", "resolution": null, "createdBy": "system", "error": null, "createdAt": "2026-10-21T22:42:41.369Z", "updatedAt": "2026-10-21T22:42:41.369Z", "consumedAt": "2026-10-21T22:42:41.369Z"}
{"id": "context-transfer:type:subagent_result:source-thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:target-thread:a9407133-8d3d-4331-861e-f02d915b88a1:1c75202a-f8e6-4769-87df-76019f5d2bac", "type": "subagent_result", "sourceThreadId": "thread:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1", "targetThreadId": "a9407133-8d3d-4331-861e-f02d915b88a1", "sourcePoint": {"threadId": "thread:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1", "runId": "run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:2", "checkpointId": "checkpoint:scope:checkpoint-scope%3Athread%3Athread%253Adelegated-task%253Acommand%25253Amcp%25253Aabdec793-e0bd-47ce-a955-268ebe82f446%25253Adelegate-task%25253Aprobe21837-writer-1%3Aname%3Aroot:name:2", "turnItemId": "turn-item:provider:codex:native-item:msg_0419411eeb37437e016ad93ff413fc8195971c86d87fc5ad26", "providerThreadRef": {"driver": "codex", "nativeId": "01a160a1-73d3-7d30-8f9f-76941c4a8451", "strength": "strong"}, "providerTurnRef": {"driver": "codex", "nativeId": "01a160a1-a071-78c2-9c08-e365fd4602e7", "strength": "strong"}}, "basePoint": null, "sourceProviderInstanceId": "codex", "targetProviderInstanceId": "codex", "targetRunId": "run:thread:a9407133-8d3d-4331-861e-f02d915b88a1:ordinal:1", "status": "consumed", "resolution": null, "createdBy": "system", "error": null, "createdAt": "2026-10-21T22:43:01.287Z", "updatedAt": "2026-10-21T22:43:01.287Z", "consumedAt": "2026-10-21T22:43:01.287Z"}

Writer run3 FINAL text (from read-only message projections):
{"createdBy": "agent", "creationSource": "provider", "id": "message:provider:codex:native-item:msg_0419411eeb37437e016ad9402badcc8195b12434389b3f40ea", "threadId": "thread:delegated-task:command%3Amcp%3Aabdec793-e0bd-47ce-a955-268ebe82f446%3Adelegate-task%3Aprobe21837-writer-1", "runId": "run:thread:thread%3Adelegated-task%3Acommand%253Amcp%253Aabdec793-e0bd-47ce-a955-268ebe82f446%253Adelegate-task%253Aprobe21837-writer-1:ordinal:3", "nodeId": "node:provider:codex:native-item:msg_0419411eeb37437e016ad9402badcc8195b12434389b3f40ea", "role": "assistant", "text": "FINAL BETA21837 CHECK21837", "attachments": [], "streaming": false, "createdAt": "2026-10-21T22:43:55.741Z", "updatedAt": "2026-10-21T22:43:55.911Z"}

Parent reported: automatic READY and INTERIM notifications only, no FINAL.
Final task_status: summary INTERIM; latestTerminalSummary FINAL BETA21837 CHECK21837.
Original READY result preserved. No source changes or synthetic projection writes used for this reproduction.