Import #779: --ephemeral on task, for runs nothing should come back to

[Edo771977]

One new PR upstream, and this one is a feature rather than a fix.

354/354, full suite run twice. tsc clean.

What it does

executeTaskRun() hardcoded persistThread: true, so every task created a persistent Codex thread — including disposable, fire-and-forget work, which then filled Codex's Recent list with Codex Companion Task: … entries nobody would ever open. runAppServerTurn already took a per-call persistThread; this wires it to an opt-in flag. Omitting it changes nothing.

What makes it worth taking is that it follows through on the consequences: an ephemeral run carries an ephemeral bit on its job record, so findLatestResumableTaskJob never offers it as a --resume-last candidate, and /codex:status and /codex:result stop printing a codex resume <id> line for a thread that was never persisted.

Resolved on top of the import

• six union conflicts in codex-companion.mjs, where this fork's task already carries --sandbox, --read-root and --resume-thread that upstream's base does not
• their refusal covers --resume/--resume-last only. This fork has a third resume form, --resume-thread <id>, and an ephemeral thread is exactly as unresumable by id as by recency — so the check and its message cover it too, with a test of its own
• tests/runtime.test.mjs was an add/add conflict. Our file is kept whole and their six ephemeral tests appended from their own copy, rather than splicing two versions of one file together — that splice is how a test ends up wearing another test's body
• the flag is wired through /codex:rescue and its subagent. Without that it would exist only on the CLI: rescue.md enumerates the flags it forwards, so a user typing /codex:rescue --ephemeral … would have had it swallowed into the prompt text, and the README would have promised a flag that the command everyone actually types silently drops

Guide

The README documents the flag where the other routing flags live — what it does, that it is refused with all three resume forms, that an ephemeral run is never a --resume-last candidate, and that the default is unchanged — plus the row in the imports table. rescue.md's argument hint and the subagent's routing rules list it, and a command-contract test asserts both sides of that forwarding.

Sabotage matrix

sabotage	which tests fail
--ephemeral ignored (persistThread always true)	3, including "runs without persisting a Codex thread"
the --resume-thread refusal dropped	"task --ephemeral rejects --resume-thread"
ephemeral jobs offered to --resume-last again	"a completed ephemeral task cannot be picked up by a later --resume-last"

🤖 Generated with Claude Code

https://claude.ai/code/session_01UXfvnjSC72HsM6EEPVt2Tg

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