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feat: implement issue #1950 — [Phase 2] Add a workflow_dispatch runner for model-ab.sh plus a liveness/effort probe, so the Opus 5.5 non-regression A/B actually executes - #1952
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…r for model-ab.sh plus a liveness/effort probe, so the Opus 5.5 non-regression A/B actually executes
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CodeAnt Nitpicks1 code suggestion1. These end-to-end tests use a stub that ignores
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Code Review
This pull request introduces scripts/evals/model-ab-dispatch.sh, a testable wrapper script that manages input validation, run clamping, and retry logic for model evaluations, alongside a comprehensive BATS test suite in tests/test_model_ab_dispatch.bats. Feedback on these changes suggests validating that evals_dir is non-empty to prevent checking the root directory, avoiding command substitutions inside conditional lists under set -e to prevent swallowed failures, adding explicit error handling for mktemp in tests, and asserting specific non-zero exit codes in test assertions instead of generic non-zero checks.
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Fixed the failing Lint check (the |
Dev-Lead — review-changes (applied)Changes committed and pushed. |
…sert specific exit codes - scripts/evals/model-ab-dispatch.sh: Add validation that evals_dir is non-empty to prevent operations on root directory - tests/test_model_ab_dispatch.bats: Add error handling for mktemp failure in setup, and assert specific exit codes (1) instead of generic non-zero checks Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Use explicit set +e/set -e around command substitution assignment to safely capture exit code and prevent potential issues with set -e semantics in subshells under conditional contexts. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In @.github/workflows/model-ab.yml:
- Line 110: Add a validation-only step before the “Liveness & effort probe” in
the workflow that checks dispatch `sets` against the supported holdouts and
fails on unknown values. Reuse the existing validation logic used by the helper
so invalid inputs are rejected before either paid model call runs.
- Line 127: Handle failures from both extract_engine_text assignments in the
probe workflow: update the result_txt extraction from probe.json and effort_txt
extraction from effort.json to explicitly capture nonzero status and leave the
corresponding text empty. Preserve the existing checks so they record FAIL or
rejected-or-unsupported and continue writing the summary.
In @scripts/evals/model-ab-dispatch.sh:
- Line 127: Update the parsing of sets_raw in the model A/B dispatch flow so
every requested whitespace-delimited set is validated and scored; alternatively,
reject multiline input before running the A/B command. Do not allow read -ra to
silently process only the first line.
- Around line 143-160: Move retry handling from the whole-command loop in the
dispatcher to model-ab.sh so each unscored (model, set) arm retries
independently; remove the dispatcher retry loop and preserve the rule that
scored arms are never rerun.
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Run ID: 38cf8cdf-dbb2-4944-91d3-1aa7e75ba44d
📒 Files selected for processing (5)
.github/workflows/lint.yml.github/workflows/model-ab.ymldocs/agentic-interaction-model.mdscripts/evals/model-ab-dispatch.shtests/test_model_ab_dispatch.bats
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Fixed. The underlying divergence was real: |
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The unaddressed items above still need work. |
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Automated review — APPROVED ✓
Risk: MEDIUM
Reviewed commit: dbc9c88bad86952811c2fd073a1d99f5ceb9eb46
Cascade: triage → audit (triage: haiku 4.5 [sonnet 5.5, sonnet 5] → deep: opus 5.5 [opus 4.8, sonnet 5.5] + duck: gemini-3.8-flash [sonnet 5.5] → audit: opus 5.5 [opus 4.8, opus 4.7])
Summary
Both hard-stops are false positives. continue-on-error sits on a non-gating liveness/effort probe that is bounded by timeout --kill-after, while the A/B step's exit code still gates the job. The 'write-all' match is a comment above permissions: {}. The new workflow is workflow_dispatch-only and guarded to main. It checks out github.sha with persist-credentials: false, grants only contents: read, passes every input through env (no expression injection), and SHA-pins its actions. The shared engine.sh changes (kill-after, deferred stdout emit, mapping a 137 at full budget to 124) are reliability fixes covered by bats tests, with no security impact. CI is green and all 47 review threads are resolved.
Findings
- minor: {"severity":"minor","category":"secret-exposure","message":"CLAUDE_CODE_OAUTH_TOKEN is set in job-level env, so the SHA-pinned first-party actions and the npm install of @anthropic-ai/claude-code can all see it. This matches the existing skill-eval-report.yml pattern. Scoping it to the probe and A/B steps would be better hygiene, but it does not block.","file":".github/workflows/model-ab.yml","line":108}
- minor: {"severity":"minor","category":"input-validation","message":"Set names are not restricted by charset. A
../xset resolves outside evals/ when the path holds a holdout/cases.jsonl, a prompt, and a scorer. Only maintainers with write access can dispatch, and only from main, so they already control the code. Consider adding a^[A-Za-z0-9_-]+$allowlist as defense in depth.","file":"scripts/evals/model-ab-dispatch.sh","line":null} - info: {"severity":"info","category":"critical-path","message":"The run_triage change is on the shared org-wide triage path. It now redirects to the token sidecar instead of
| tee, drops a retried attempt's stdout, and maps a 137 at or past TRIAGE_TIMEOUT_SEC to the non-retryable 124. Stderr still flows, so rate-limit detection is preserved, and bats tests cover the change. This is a behavior change, not a security issue.","file":"scripts/engine.sh","line":1410} - info: {"severity":"info","category":"eval-integrity","message":"run-eval.sh now lets a quality miss take precedence over infra, and treats a judge invocation failure as infra. Both close false-accept paths in the non-regression gate, so they strengthen it.","file":"scripts/evals/run-eval.sh","line":319}
- info: {"severity":"info","category":"model-pins","message":"The hard-coded claude-opus-5-5 and claude-opus-4-8 defaults carry model-pin-ok annotations that cite #1950, #1978 and #1979, and the check-model-pins check passes. An A/B comparison needs specific model versions to be meaningful.","file":".github/workflows/model-ab.yml","line":33}
Reviewed by the PR-review cascade (triage: haiku 4.5 [sonnet 5.5, sonnet 5] → deep: opus 5.5 [opus 4.8, sonnet 5.5] + duck: gemini-3.8-flash [sonnet 5.5] → audit: opus 5.5 [opus 4.8, opus 4.7]). Reply if you need a human review.
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pr-review approved on PARTIAL advisory evidence: 6/7 required advisory bots reported before the gate's head-age-timeout fallback proceeded. Recorded for the miss-rate metric (#1596). |
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Automated review — APPROVED ✓
Risk: MEDIUM
Reviewed commit: dbc9c88bad86952811c2fd073a1d99f5ceb9eb46
Cascade: triage → audit (triage: haiku 4.5 [sonnet 5.5, sonnet 5] → deep: opus 5.5 [opus 4.8, sonnet 5.5] + duck: gemini-3.8-flash [sonnet 5.5] → audit: opus 5.5 [opus 4.8, opus 4.7])
Summary
Both deterministic hard-stops are false positives. continue-on-error applies only to the token-spending liveness/effort probe, which AGENTS.md #1776 says should fail open with a warning, and the A/B step still propagates its exit code as the job verdict. The 'write-all' match is in a comment that explains why permissions: {} is set at the top level; the job only gets contents: read. The new workflow runs only on workflow_dispatch, refuses any ref but main, checks out github.sha with persist-credentials:false, passes all inputs through env vars (no expression injection), and uses action SHAs I verified against the GitHub API and the existing org pins. The engine.sh and run-eval.sh changes don't weaken any gate. A judge failure now exits 2, which gate.sh and score-gate.sh both treat as a hard failure. The only residual issue is minor hardening: the OAuth token is set in job-level env.
Findings
- MINOR: CLAUDE_CODE_OAUTH_TOKEN is set in job-level env, so the npm install step (third-party install scripts) and the cache/upload actions can see it. This is identical to the existing wiring in skill-eval-report.yml:103 and runs only on maintainer-dispatched main. Recommended hardening, not blocking: move the token to step-level env on the probe and A/B steps only. (
.github/workflows/model-ab.yml:89) - INFO: continue-on-error: true is on the 'Liveness & effort probe' step only. That step is an indeterminate liveness probe, which AGENTS.md (#1776) explicitly requires to fail open with ::warning::. Each probe call is bounded by timeout --kill-after, so it cannot starve the A/B step. The A/B step has no continue-on-error and runs
exit "$rc", so the verdict gate is not masked. (.github/workflows/model-ab.yml:208) - INFO: The 'write-all' match is in a YAML comment. The effective config is top-level
permissions: {}plus job-levelcontents: read, with no write scopes and no id-token. Checkout uses persist-credentials: false. (.github/workflows/model-ab.yml:51) - INFO: Trigger is workflow_dispatch only (no pull_request_target, no pull_request, no schedule). Every dispatch input (candidate, incumbent, sets, runs) and github.ref goes through env: and is quoted in shell. The claude_code_version step output is used only in a cache key and in env. All four action SHAs (checkout 3d3c42e5, setup-node 82076278, cache 55cc8345, upload-artifact 043fb46d) resolve via the GitHub API and match the pins used elsewhere in the repo. (
.github/workflows/model-ab.yml) - INFO: model-ab-dispatch.sh validates offline before anything paid runs. It rejects commas/whitespace in model ids, identical arms, multiline or duplicate sets, more than 8 sets, unknown or non-triage sets, and missing fixtures. It clamps runs to 1..3 with an overflow guard and builds the command as an array. Set names are not restricted to a charset, so '..' style paths only get existence checks. The impact is negligible because only maintainers with write access can dispatch. (
scripts/evals/model-ab-dispatch.sh) - INFO: In engine.sh, every engine CLI call now runs under
timeout --kill-after. run_triage's claude path redirects to a sidecar file instead of piping through| tee, which preserves _CLAUDE_CHAIN_MODEL_USED, and it drops output from retried attempts. A 137 exit at or past budget is rewritten to 124 (non-retryable). None of this touches secret handling or auth. One side effect: production triage output is no longer streamed live, only emitted after completion. bats coverage was added and passes. (scripts/engine.sh) - INFO: In run-eval.sh, a judge invocation failure now classes as infra (exit 2) instead of scoring 0. gate.sh and score-gate.sh both treat rc>=2 as a hard failure, so an eval gate cannot be passed by making the judge fail. The rewritten exit-code block is logically equivalent to the old code, despite its comment describing a precedence change. (
scripts/evals/run-eval.sh:427) - INFO: The
# model-pin-ok: <reason>annotations follow the AGENTS.md model-pin standard, which allows a concrete id where one is genuinely required. An A/B between two specific model versions qualifies. The annotation trailing the prose comment on line 9 is cosmetic. (.github/workflows/model-ab.yml:9)
Reviewed by the PR-review cascade (triage: haiku 4.5 [sonnet 5.5, sonnet 5] → deep: opus 5.5 [opus 4.8, sonnet 5.5] + duck: gemini-3.8-flash [sonnet 5.5] → audit: opus 5.5 [opus 4.8, opus 4.7]). Reply if you need a human review.
2 participants
Problem
[Phase 2] Add a workflow_dispatch runner for model-ab.sh plus a liveness/effort probe, so the Opus 5.5 non-regression A/B actually executes
From the issue: As a review-engine maintainer, I want a manually dispatched workflow that runs
scripts/evals/model-ab.shand a liveclaude-opus-5-5liveness/effort probe in CI, so that the epic's non-regression metric (model-ab.sh claude-opus-5-5 claude-opus-4-8exits 0) and #1897's live ACs produce real evidence before the deep tier is promoted pastnext.Risk
Medium — changes GitHub Actions workflow behavior, which is exercised only post-merge; verify via the affected workflow runs.
Test plan
Tests added/updated:
tests/test_model_ab_dispatch.bats. Verification:bash scripts/dev-lead-lint.sh(shellcheck --severity=warning) ran pre-commit; the bats suite runs in CI.Rollback
Revert this PR. No non-revertible side effects (no tags, migrations, or external state).
Monitoring
Watch the affected workflow run(s) in the Actions tab and this PR's Lint check for regressions.
Closes #1950
Summary by CodeRabbit