fix(claude): adopt a quest branch at the remote tip that was inspected - #3421
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Handing the agent "the existing branch" names a branch, and a plain checkout of that name prefers a same-named local ref. When that ref sits at an older or divergent tip, the agent rebases the wrong history and the lease does not catch it: --force-with-lease asserts the remote ref's old value, not that the pushed history contains it, so the push succeeds and the remote-only commits are gone. The instruction written to stop work being lost was the one that lost it. Name the inspected SHA instead of the branch, and reset to it with git checkout -B before rebasing, so the adopted history is the one that was actually looked at. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| checkout picks, and the lease only asserts the remote's old value, not that | ||
| the pushed history contains it, so rebasing that local ref and pushing it | ||
| would drop the remote-only commits while the lease passes. The agent resets | ||
| to the inspected SHA (`git checkout -B <branch> <sha>`) before rebasing onto |
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When the same-named local branch is divergent because it contains unpushed real commits, this command resets its ref to the inspected remote SHA before preserving or reconciling those commits. Git 2.43's git checkout -h describes -B as “create/reset and checkout a branch,” so this fixes the remote-only data-loss case by introducing a local-only one, leaving the discarded commits reachable only through recovery mechanisms such as the reflog. Inspect the ancestry and back up or reconcile local-only commits before resetting to the remote tip. (Written by GPT-5.6 Sol)
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WalkthroughUpdated the spawn-quest instructions to reset existing branches to the inspected remote SHA before rebasing. Claim placeholder pushes now use a lease pinned to that SHA. Agent instructions include both requirements for adopting an existing branch. Merge Risk: 🟡 Moderate · up to The branch-adoption instructions can still overwrite concurrent quest-branch commits. The push command should explicitly pin the destination ref and inspected SHA before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.claude/skills/spawn-quest/SKILL.md:
- Line 45: Update the git push guidance near the fresh UUID lease placeholder to
require an explicit SHA-pinned --force-with-lease containing the destination
branch and expected SHA, alongside an explicit HEAD:refs/heads/<branch>
destination ref; do not instruct agents to use bare --force-with-lease.
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Two follow-ups on the adopt path, both variants of the bug being fixed rather than new ground. git checkout -B discards whatever the local ref had that the remote tip does not, so resetting to the inspected SHA fixes the remote-loss case by creating a local-loss one. Gate the reset on git merge-base --is-ancestor: when the local ref carries commits the remote does not, leave it alone and treat the quest as claimed, rather than choosing which side's work to destroy. The claim push said "--force-with-lease pinned to that SHA" in prose. A bare --force-with-lease takes its expected value from the remote-tracking ref, which the fetch at the top of triage has just updated, so it compares the ref against itself and asserts nothing. Write the push out in full, with an explicit destination refspec, so there is nothing to infer. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Both findings are correct and fixed in a4de123. Both are variants of the bug this PR set out to fix rather than new ground, which is the useful thing about them.
The lease was prose, and prose defaulted to the unsafe form. The text said "pushed under a lease pinned to that SHA", which reads like a guarantee but does not say how. A bare Taken together with the earlier rounds, every failure on this path came from naming an intent rather than the command that enforces it: "delete the ref", "the existing branch", "pinned to that SHA". The section now names SHAs and full commands throughout.
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| would drop the remote-only commits while the lease passes. | ||
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| The agent resets to that SHA with `git checkout -B <branch> <sha>` before | ||
| rebasing onto the base, and only when `git merge-base --is-ancestor <local> <sha>` holds. When it does not, the local ref carries commits the remote does |
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When stale real work exists only on the remote, the new ancestry guard runs with a nonexistent <local> ref, so git merge-base --is-ancestor exits 128 and the instructions incorrectly treat the quest as claimed. This prevents adopting the common remote-only stale branch even though git checkout -B <branch> <sha> would safely create it at the inspected tip; check whether refs/heads/<branch> exists first and apply the ancestry guard only when it does. (Written by GPT-5.6 Sol)
AGENTS.md reference: quest/AGENTS.md:L107-L108
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The ancestry guard assumed a local branch exists. When the stale branch only ever existed on the remote, which is the ordinary case, there is no refs/heads/<branch>, git merge-base --is-ancestor exits 128 rather than answering, and the rule that reads any failure as "leave it alone" takes the quest out of the pool. The guard added to make adoption safe made the common adoption impossible. Check the ref exists first. Absent, the reset creates it at the inspected tip and nothing can be lost. Present, the ancestry test decides, and a failure still means the local ref holds commits the remote does not. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Correct, fixed in 736b697. The guard I added to make adoption safe made the ordinary adoption impossible: a branch that only ever existed on the remote has no Stepping back, since this is the sixth round on the same fifteen lines and every one has been a correct finding. The sequence was: unconditional delete, then a leased delete that ignored the local ref, then adopt-by-name that resolved to the wrong tip, then a reset that discarded local commits, then a guard that mishandled a missing ref. Each fix introduced the next narrower version of the same bug, and each was prose describing git commands rather than the commands themselves, which is exactly where the ambiguity kept hiding. Worth saying plainly: the whole sequence traces to one rare case, adopting a stale branch that carries real work. The placeholder-only and genuinely-claimed cases have been stable since the first round. If review finds a seventh variant here, the better fix is to delete this case rather than patch it again, and have triage report a stale branch with real commits and take the quest out of the pool for a human to decide. The safe fallback already exists and costs only that someone looks at a rare branch by hand. I have flagged that to the repository owner as the call to make rather than making it unilaterally, since it is a capability reduction.
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| continue, reset to the SHA triage inspected, rebase onto the base, and claim | ||
| it with the same explicit lease (`--force-with-lease=<branch>:<sha>`, pushing | ||
| `HEAD:refs/heads/<branch>`), so a second adopter loses the race rather than |
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When adopting a remote-only quest whose selected base is dev, git checkout -B <branch> <sha> creates the local branch without an upstream, and the explicit push on lines 99-101 does not configure one. Git 2.43's git push -h identifies only -u/--set-upstream as setting the upstream. Consequently, the prescribed just check and just test fall back to origin/main, pulling every dev-only change into their scope and potentially making the agent run or fail unrelated checks. Explicitly run git branch --set-upstream-to=origin/<base> after the reset, as required by the repository workflow, without changing the lease-protected push. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L233-L239
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git checkout -B leaves the branch without an upstream, and pushing an explicit refspec does not add one, so an adopted branch had none. The diff-aware just check and just test read the base from the upstream and fall back to origin/main without one, which on a dev-based quest pulls every dev-only commit into scope: the agent then lints and compiles work it did not touch, and reads any failure there as its own. The fresh-cut path already pointed the upstream at the base. The adopt path now does too. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Correct, fixed in bac8db7. Worth noting this one is not another variant of the adopt-tip case that has been cycling. It sits in the Spawning instructions, and it is the failure the repository's own Workflow section warns about. I hit it myself earlier in this session on a dev-based branch, which is a fair indication of how easy it is to miss: the fresh-cut path already said to point the upstream at the base, and the adopt path was added later without carrying that over.
(written by Claude Opus 5) |
* docs(quest): settle scope narrowing in place, and mark pre-media sidecar placement (moq-dev#3427) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> * fix(moq-video): pick the V4L2 mode nearest the requested resolution (moq-dev#3355) Co-authored-by: Luke Curley <kixelated@gmail.com> Co-authored-by: Codex <codex@openai.com> * feat(moq-video): add the Android MediaCodec encoder and decoder (moq-dev#3354) Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-authored-by: Luke Curley <kixelated@gmail.com> * docs(quest): import the post-grooming issues as quests (moq-dev#3431) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> * docs(quest): apply the Codex findings on the issue import (moq-dev#3432) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> * fix(claude): adopt a quest branch at the remote tip that was inspected (moq-dev#3421) Co-authored-by: Claude Opus 5 <noreply@anthropic.com> * docs(quest): record four findings from the m1 quest wave (moq-dev#3424) Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> * docs: reorganize the site around what a reader can do (moq-dev#3426) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> * chore: ignore Claude Code's scratch directories (moq-dev#3428) Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> * chore(moq-audio,moq-cli): assert publish_capture stays Send off macOS (moq-dev#3433) Co-authored-by: Claude Opus 5 <noreply@anthropic.com> * docs: correct claims found during merge review (moq-dev#3435) Co-authored-by: GPT-5 <noreply@openai.com> * docs(quest): import the open issues that had no quest, and gate the dev merge (moq-dev#3434) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> * docs(moq-audio): scope the local-task guidance to macOS (moq-dev#3436) Co-authored-by: Claude Opus 5 <noreply@anthropic.com> * docs: track deferred review findings (moq-dev#3438) Co-authored-by: GPT-5 <noreply@openai.com> * chore: remove redundant packaging work and plan relay ownership fixes (moq-dev#3440) Co-authored-by: GPT-6 <noreply@openai.com> * perf(net): avoid redundant chunk copies and plan performance investigations (moq-dev#3443) Co-authored-by: GPT-6 <noreply@openai.com> * fix(transcode): follow a source resolution change with the ladder (moq-dev#3381) Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: GPT-5 <noreply@openai.com> * feat(watch): share one AudioContext across audio decoders Spatial playback needs every remote in the same Web Audio graph. Injected contexts are never closed. Co-Authored-By: Cursor Grok 4.6 <noreply@cursor.com> Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: Luke Curley <kixelated@gmail.com> Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> Co-authored-by: Franz Heinzmann <frando@unbiskant.org> Co-authored-by: Codex <codex@openai.com> Co-authored-by: GPT-5 <noreply@openai.com> Co-authored-by: Cursor Grok 4.6 <noreply@cursor.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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What
Follow-up to #3409, which merged before this finding was addressed. It is the one genuinely dangerous bug in this series, so it should not sit on
mainunfixed.#3409 taught the skill to adopt a stale branch that carries real work: hand the agent "the existing branch" to continue rather than cutting a fresh one over it. Naming a branch is the bug. A plain checkout of that name prefers a same-named local ref, and when that ref sits at an older or divergent tip the agent rebases the wrong history.
The lease does not catch it.
--force-with-lease=<branch>:<sha>asserts the remote ref's old value, not that the pushed history contains it, so the push succeeds and the remote-only commits are gone. The instruction written to stop someone's work being lost is the one that loses it, and it does so silently, on the path specifically meant to preserve abandoned work.Instead
Name the inspected SHA, not the branch, and reset to it explicitly with
git checkout -B <branch> <sha>before rebasing onto the base. The adopted history is then the history that was actually looked at, and the lease pinned to that same SHA still decides the race between two adopters.Checks
just checkexits 0. One Markdown file under.claude/, so no Rust, JS, Python, or quest validation is in scope.🤖 Generated with Claude Code
(Written by Claude Opus 5)