feat(engine): name an earlier attempt's parked work in retry dev prompts (#777) - #833
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WalkthroughRollback records whether a dev session produced parked work. Retry prompts identify that work only when its ref resolves and matches the task’s baseline and run. The notice describes the ref and verification requirements. The change does not replay the work. ChangesRetry Preservation Notice
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Engine
participant RecoveryFlow
participant Git
Engine->>RecoveryFlow: Provide recorded dev-session status
RecoveryFlow->>Git: Resolve preserved ref and check baseline ancestry
Git-->>RecoveryFlow: Return ref and ancestry results
Engine->>RecoveryFlow: Request retry preservation notice
RecoveryFlow-->>Engine: Return notice when checks pass
Suggested reviewers: Merge Risk: 🟡 Moderate · up to After an interrupted development session, a retry may fail to identify saved work. Malformed saved state can also incorrectly identify work as belonging to an attempt. Resolve the interruption path before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 7 files. (1 skipped: 1 too large.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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A rolled-back attempt's work is parked on a recovery ref, but the retry prompt never mentioned it, so the next attempt rebuilt it from scratch. recovery_flow.retry_preserve_paragraph is the one builder, shared by the sprint, stories and sweep fresh-baseline dev legs via Engine._retry_preserve_notice. It is offered only when the ref carries this run's name (and, for a snapshot, this task's baseline), resolves to a commit through the verify chokepoint, and descends from and differs from the task baseline. It also needs the new StoryTask.preserve_from_attempt provenance: a rollback stamps it from whether a dev session of the current attempt was recorded, and a sweep divergent adoption clears it while keeping the ref. The wording says "earlier attempt", labels commits-only preservation, gives git log/diff commands built from verified values, and states the work is unverified with gates to pass fresh. Nothing is replayed, and no ref is cleared or deleted to suppress guidance.
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In `@src/bmad_loop/engine.py`:
- Line 884: Update the `dev_attempt_recorded` probe to use durable evidence that
the current attempt was launched, rather than requiring
`_current_dev_session_index` to find a completed `SessionRecord`. Ensure it
recognizes interrupted or aborted sessions so `retry_preserve_paragraph`
includes the notice after resume.
In `@src/bmad_loop/model.py`:
- Line 832: Update the `preserve_from_attempt` assignment in the model
deserialization flow to accept only a literal boolean true from stored data;
treat strings, numbers, and all other shapes as false.
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A session is recorded only once it returns, so a hard stop or host death mid-session left the restart arm parking that session's tree with no provenance, and the retry prompt dropped the pointer. A durable DEV_RUNNING (saved after the attempt bump, before launch) now counts as dispatch evidence alongside a recorded session.
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| ``attempt`` is bumped and before the launch, and a resolve re-drive's | ||
| reset runs from the ``PENDING`` that ``runs.rearm_escalation`` leaves | ||
| (under a bumped ``generation``, so no current-attempt record either).""" | ||
| return task.phase == Phase.DEV_RUNNING or self._current_dev_session_index(task) is not None |
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When the process exits after _dev_phase saves DEV_RUNNING but before adapter.run actually launches—such as during prompt construction, after a mutating pre-session hook, or on a transport startup error—this returns true even though no dev session was dispatched. If the pre-launch path left changes, recovery parks them with preserve_from_attempt=True, and the next prompt incorrectly tells the agent that an earlier attempt produced those changes. Use a durable marker written at the actual launch boundary rather than treating DEV_RUNNING, which is persisted before launch, as proof of dispatch.
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Not changing this; the window is real but the extra tracking isn't justified.
- Nothing gets parked unless something wrote to the tree before launch. A fresh-baseline leg enters
DEV_RUNNINGon a baseline tree. A failure beforeadapter.runleaves it clean, the rollback takes therollback-skipped-cleanreturn, andpreserve_from_attemptis stamped only on the dirty path. The other things that dirty the tree in that window are the fixable-repair tree and the intent-gap patch restore. Both hold work from an earlier dispatched attempt, so the attribution is still correct. - What's left is a pre-session hook that mutates the tree, followed by a crash before launch. Those hook changes are already credited to the attempt on the normal path, because a recorded session's parked tree includes whatever its pre-session hooks wrote. A launch marker would not separate hook bytes from session bytes, so it would not make the claim any more exact.
- The effect is limited to one informational paragraph. It still has to pass the ref-name, baseline, resolve and ancestry checks. It tells the session the work is unverified, has not been applied, and that every gate must pass fresh.
A durable launch marker would mean a new persisted field and a state save on every session launch, just to cover a hook-writes-then-crash window. Before 5dc5ca1, the hard-stop/crash-mid-session resume left the notice out, and that is a common path.
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Closes #777.
Summary
recovery_flow.retry_preserve_paragraphis the single builder for the notice. The sprint, stories and sweep fresh-baseline dev legs all use it throughEngine._retry_preserve_notice. The paragraph is offered only when all of these hold:StoryTask.preserve_from_attemptfield is set. A rollback sets it based on whether a dev session of the current attempt was recorded. A sweep divergent adoption clears it and keeps the ref.git log/git diffcommands built from verified values, and states that the work is unverified and must pass the gates fresh. Nothing is replayed, and no ref is cleared or deleted to suppress the notice.Notes for reviewers
is_ancestor: a ref that fails to resolve also fails the ancestry check. So the ablation for the resolve gate had to remove both checks. The test docstring says so.trunk checkclean across the stack.Stack
Part of a stack; merge bottom-up. This is layer 8 of 8 (top), on top of #832.
Stack order (bottom → top): #826 → #827 → #828 → #829 → #830 → #831 → #832 → #833.
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