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fix(runner): a compaction outage is not a driver bug - #6735
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`loop_failure_kind_name` mapped every `LoopFailureKind` to its run-failure category except one: `CompactionUnavailable` fell through the `_ => "driver_bug"` backstop. The category string `"compaction_unavailable"` already existed in `ALL_RUN_FAILURE_CATEGORIES` and already had its own user-facing summary — the only thing missing was the arm producing it. Consequences of landing on `driver_bug` instead: - `compaction_unavailable` IS auto-retriable (`retry_disposition::is_auto_retriable_category`); `driver_bug` is NOT. A run that would have re-driven itself from its checkpoint died instead. - The user was told "The agent runtime reported an internal error. Retry the run, and contact support if it happens again." for a transient resource condition — reporting our own code as broken when it was not. - Failure metrics counted a resource outage as a driver defect. The wildcard itself is forced, not a choice: `LoopFailureKind` is `#[non_exhaustive]`, so this downstream crate cannot match exhaustively and the compiler cannot flag a variant that falls through. That is exactly why this sat undetected. `every_loop_failure_kind_maps_to_its_own_category` is the substitute for the missing compile-time check. It asserts against each kind's OWN `as_str()` rather than a second hand-written list of category literals, so the test cannot drift into the same duplication it exists to police — the driver's match is already a re-implementation of `as_str()`, and this is the copy that drifted. Red-verified: removing the new arm fails with left: "driver_bug" right: "compaction_unavailable" Verified: cargo test -p ironclaw_runner --lib --no-fail-fast — 356 passed, 0 failed; clippy --all-targets --all-features -D warnings clean. Found while auditing #6284 item 7's catch-all cleanup. Note for that item: its other claim — that `failure_lane()` is "vacuous" because it ignores its `category` argument — does not hold. The lane (re-drivable vs terminal) depends only on checkpoint presence; the category is used by `retry_disposition` for the auto-vs-user-initiated decision, and the unused parameter is a documented seam for a future mid-run safety-abort category. No fix needed there. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe runner now maps ChangesFailure category mapping
Estimated code review effort: 2 (Simple) | ~10 minutes Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 1
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@crates/ironclaw_runner/src/text_loop_driver.rs`:
- Around line 274-337: Add caller-level regression coverage for the production
retry-decision path handling CompactionUnavailable, driving the real caller
rather than only loop_failure_kind_name. Assert that the resulting category is
compaction_unavailable and is recognized as auto-retriable, while preserving the
existing mapping unit tests.
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crates/ironclaw_runner/src/text_loop_driver.rs
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❌ IronLoop Review: reviewer
Review at a glance
| Verdict | Blocking | Notes | Inline | Head |
|---|---|---|---|---|
| ❌ Changes requested | 1 | 0 | 1 | 324771addaf9 |
Head: 324771addaf994ed8f6e39b994e5373f75ef3dc5
Next: Fix the blocking findings, push the PR branch, then re-run this reviewer.
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Status: Current
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Summary
The new arm is not on a production compaction-failure path, so this PR does not change the reported runtime behavior.
Findings
Blocking: 1 / Notes: 0
Blocking findings
1. ❌ [MEDIUM] Compaction mapping change is unreachable in production
Location: crates/ironclaw_runner/src/text_loop_driver.rs:261
loop_failure_kind_name is only called with fixed non-compaction variants in this text-only driver; no production source constructs or passes CompactionUnavailable to it. The planned loop path instead carries a LoopExit::Failed, whose failure category already comes directly from LoopFailureKind::as_str() in ironclaw_turns. The compaction matrix also models this error as a best-effort path that completes rather than failing the run. Consequently this arm and its direct unit test cannot change an observed compaction outage from driver_bug to compaction_unavailable. Trace and fix the actual producer/runner path, with an end-to-end regression test, or remove/retarget this no-op change.
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| LoopFailureKind::PolicyDenied => "policy_denied", | ||
| // LoopFailureKind is `#[non_exhaustive]`; fail closed if a new variant | ||
| // lands in `ironclaw_turns` ahead of this matcher being updated. | ||
| LoopFailureKind::CompactionUnavailable => "compaction_unavailable", |
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This mapping is not reached by a production compaction failure: the text-only driver calls this helper only with fixed non-compaction variants, while the planned-loop LoopExit::Failed path already uses LoopFailureKind::as_str(). Please trace and test the actual failing path; this arm alone cannot change the reported runtime category.
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You are right, and this PR's premise is wrong. Retracting the claim.
I traced it after your comment:
loop_failure_kind_namehas 8 call sites, every one passing a hardcoded literal (InvalidModelOutput×2,DriverBug×2,TranscriptWriteFailed,ModelError×2,CheckpointRejected). No call site passes a dynamicLoopFailureKind, soCompactionUnavailablecannot reach the function at all.- The real path is the planned loop's
LoopExit::Failed, which usesLoopFailureKind::as_str()directly — andas_str()already mapsCompactionUnavailable → "compaction_unavailable". The existing assertion atplanned_driver.rs:1000(failed.reason_kind.as_str() == "checkpoint_unavailable") confirms that shape.
So the user-facing consequence I asserted in the PR body — a compaction outage reporting as driver_bug, losing auto-retry, and telling the user to contact support — does not occur. The retry-lane and summary differences between the two categories are real, but nothing routes a compaction failure through the arm I added.
What I actually did was find a gap in a mapping table and assert a downstream consequence without tracing whether production reaches it. That is precisely what .claude/rules/discovery-claims.md exists to prevent, and your second comment is the trace I should have run first.
Two things follow, and I would rather you pick than have me guess:
- Close this PR. The fix is a no-op and the body makes a false claim. Cleanest option.
- Keep a reduced version, retitled to what it actually is: the
_ => "driver_bug"wildcard is a latent hazard if a future caller ever passes a dynamic kind, andevery_loop_failure_kind_maps_to_its_own_categorywould catch that the moment it happened. That is defensible as defense-in-depth, but it is a maintenance guard, not a bug fix, and the PR must say so.
Your first comment (3659481551) stands either way and is the same lesson: my tests only exercised the helper, never the caller, so they could not have revealed that the caller never passes this variant. Caller-level coverage would have failed to construct the scenario at all, which is the signal I missed.
I have corrected the claim on #6284 as well.
🤖 Addressed by Claude Code
Coverage ratchetReborn integration-tier coverageLine coverage (Reborn crates): 85.54% — 307679 / 359687 lines Per-crate breakdown (60 crates, lowest-covered first)
This table itself is informational and never gates the PR on its own — not the percentage, not the per-crate holes, not the 0-coverage callout. A separate coverage ratchet (dry-run until enforce=true; see tests/integration/coverage-floor.toml) can fail the build on specific configured floors. Exemptions (3 entry/entries excluded from the accounting above)
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🚅 Deployed to the ironclaw-pr-6735 environment in ironclaw-ci-preview
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Closing: the premise does not hold.
The category difference I cited was real ( Thanks to the reviewer for pushing on it rather than accepting the fix — the second comment asked for the caller-path trace, and running that trace is what showed there is no caller path. Retraction and full trace: #6735 (comment) Not reopening as a maintenance guard for now — a completeness test whose scenario cannot be constructed in production is weak coverage, and item 7's catch-alls are either forced by |
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What
loop_failure_kind_namemapped everyLoopFailureKindto its run-failure category except one:CompactionUnavailablefell through the_ => "driver_bug"backstop.The category
"compaction_unavailable"already existed inALL_RUN_FAILURE_CATEGORIESwith its own user-facing summary. The only thing missing was the arm producing it.Why it matters
compaction_unavailable(correct)driver_bug(what happened)So a transient resource condition that should have re-driven itself from its checkpoint instead killed the run and told the user to report a bug in our code that had not occurred.
Why the compiler could not catch it
LoopFailureKindis#[non_exhaustive], so this downstream crate cannot match exhaustively — the wildcard is forced, not chosen. That is precisely why the variant sat there undetected.every_loop_failure_kind_maps_to_its_own_categoryis the substitute for the missing compile-time check. It asserts against each kind's ownas_str()rather than a second hand-written list of category literals, so the test cannot drift into the same duplication it polices — the driver's match is already a re-implementation ofas_str(), and it is the copy that drifted.Adding a variant in
ironclaw_turnsstill requires updating both the matcher and the list in this test. The compiler will not say so; this test will.Validation
left: "driver_bug"/right: "compaction_unavailable"cargo test -p ironclaw_runner --lib --no-fail-fast— 356 passed, 0 failedcargo clippy -p ironclaw_runner --all-targets --all-features -- -D warnings— cleanCorrection to #6284 item 7
Found while auditing that item's catch-all cleanup. Its other claim does not hold, and I would rather say so than leave it as work someone picks up:
failure_laneis correct. The lane it returns is binary — re-drivable from a checkpoint, or terminal-with-an-explanation — and that genuinely depends only on checkpoint presence. The category is used, byretry_disposition, for the finer auto-vs-user-initiated decision. The unused parameter is a documented seam for a future mid-run safety-abort category mapping toFailureLane::Security.Two implementations do compute the lane by separate paths (
failure_laneandRetryDisposition::failure_lane), kept in agreement bydisposition_is_consistent_with_failure_lane. That is worth collapsing eventually, but delegating would move the documentedSecurityseam intoretry_disposition, where it does not belong — so not in this PR.Independent of #6684 and #6697 (different crate, different concern).
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