real dev verification, 2026-10-30 UTC
browser: repo playwright 1.60.0, /usr/bin/google-chrome, actual web composer
provider: codex gpt-6.1-sol, local proxy; no mocks, seeds, or fixtures
baseline github/main: c6ef3b46ebed34fbefa1706674fe5748254cee18
pr head: b305e57a09eaad572e0f6bd0a48b7251370696f7

main
{"at":"2026-10-30T21:43:46.172Z","tool":"t3-code.delegate_task","status":"completed","mode":"async","target":{"providerInstanceId":"codex","model":"gpt-6.1-sol"},"title":"identify one documented user feature","result":"running"}
{"kind":"subagent","status":"completed","startedAt":"2026-10-30T21:43:46.227Z","completedAt":"2026-10-30T21:44:26.195Z"}

pr
{"at":"2026-10-30T21:46:44.710Z","tool":"t3-code.delegate_task","status":"completed","mode":"async","target":{"providerInstanceId":"codex","model":"gpt-6.1-sol"},"title":"identify one documented user feature","result":"running"}
{"at":"2026-10-30T21:47:42.545Z","tool":"t3-code.delegate_task","status":"completed","mode":"async","target":{"providerInstanceId":"codex","model":"gpt-6.1-sol"},"title":"review orchestration-v2 architecture","result":"running"}
{"at":"2026-10-30T21:48:06.554Z","tool":"t3-code.task_cancel","status":"completed","result":"cancel_requested"}
{"at":"2026-10-30T21:48:06.656Z","command":"/bin/bash -lc 'git branch --show-current'","exitCode":0,"output":""}
{"kind":"subagent","status":"completed","startedAt":"2026-10-30T21:46:44.731Z","completedAt":"2026-10-30T21:46:56.905Z"}
{"kind":"subagent","status":"interrupted","startedAt":"2026-10-30T21:47:42.562Z","completedAt":"2026-10-30T21:48:06.688Z"}

observed in UI: both refs show child lineage, completed result, and parent automatic follow-up.
pr neighbor checks: explicit delegate_task honored; task_cancel terminalized child as interrupted; ordinary git command completed without another delegate or top-level thread.
blacksmith: vp test run apps/server/src/provider/CodexDeveloperInstructions.test.ts: 6 tests passed.
not reproduced: original Claude background Agent error. Codex main already used delegate_task. Claude catalog reports unauthenticated.
native desktop/mobile and non-Codex providers not exercised. No code changes.