feat(bench): 3 QA cascade scenarios (#104)#127
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PR-C of the cascade expansion: three verdict-graded QA cascades. The agent
reasons about a HIDDEN dependency from its doc and ends with a VERDICT line;
graded deterministically by rubric (no code execution). Each drift is
detectable by surf (structural/literal, not an identifier swap).
- cascade-idempotency-window-qa (T2, payments) — IdempotencyStore.is_duplicate
body `key in self._processed` -> `return False` (dedup guard removed; a
retried payment can double-charge).
- cascade-ratelimit-burst-qa (T2, rate-limiting) — RatePolicy.admission_mode
"fixed_window" -> "token_bucket" (idle clients can now burst above the rate).
- cascade-session-expiry-tz-qa (T2, dates/tz) — is_expired threshold `> 7200`
(2h, local+grace) -> `> 3600` (1h, UTC); a 90-min session flips valid->expired.
Each: author.py seals a genuine "changed" divergence, the rubric encodes the
T1 truth as [correct] and the stale claim as [misled], and validate_scenario
proves polarity via .author/solution_{correct,stale}.txt.
Note: all three are single-anchor. A genuine T3 "multi-claim" scenario needs
author.py to seal more than the first anchor's hash (it currently seals only
the first) — deferred as a small tooling follow-up.
Verified offline: author.py seals all three, validate_scenario green, a mock
run is error-free, uv run pytest passes (38).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 14, 2026
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Summary
PR-C of the cascade-family expansion: 3 verdict-graded QA cascades. The agent reasons about a hidden dependency from its doc and ends with a
VERDICT:line, graded deterministically by rubric (no code execution). Branches offmain, independent of the TS PR (#126) — no stacking.cascade-idempotency-window-qais_duplicatebodykey in set→return False(dedup guard removed)cascade-ratelimit-burst-qaadmission_mode"fixed_window"→"token_bucket"(bursts now possible)cascade-session-expiry-tz-qais_expiredthreshold> 7200→> 3600(grace removed; 90-min session flips valid→expired)Each:
author.pyseals a genuine"changed"divergence, the rubric encodes the T1 truth as[correct]and the stale claim as[misled], andvalidate_scenarioproves polarity via.author/solution_{correct,stale}.txt.Verification (offline)
python tools/validate_scenario.py— all three green (rubric polarity).uv run pytest— 38 passed;cargo fmt --all --checkclean.Note: no T3 yet
All three are single-anchor (T2). A genuine T3 "multi-claim" scenario (a hub with several anchored claims, one drifted) needs
author.pyto seal every anchor's hash — it currently seals only the first. I deferred that as a small tooling follow-up rather than block this PR.Scope / phase-7 status
PR-C of Connorrmcd6/surface-bench#12. With #126 (TS) and this merged, the cascade family is 4 → 14 (10 py, 4 ts; 11 code, 3 qa). That frozen set unblocks the phase-8 pre-registration.
🤖 Generated with Claude Code