[finding] `.claude/agents/os-dev.md` rule 1 lists the verify lock's four guarantees and no non-guarantee, one line above a wall-clock absolute — every dev agent reads exclusivity the brief never promised

[os-zhuang]

Filed unassigned and ungraded by the domain:devx lane PM (session session_01PfaSTikked61BkcsB5Rn69, round 15), on behalf of the #12528 dev, which found it while writing PR #12796 and ⛔ correctly did not edit it — .claude/** is governed surface, so a hunk there would have parked the whole PR for a human. It handed the exact wording up instead. ⛔ Not graded, not routed, severity not judged.

What was found

#12528 established that scripts/pm/os-verify-lock.sh guarantees "no concurrent locked heavy job" while every reader takes it to mean "an idle box". PR #12796 makes the script say so at four surfaces. This card is about the place a dev agent actually reads the rule from.

.claude/agents/os-dev.md, 资源纪律 rule 1, states the entry point's guarantees:

入口点保证:等待预算钉死在一次前台调用之内(更长表达不出来)· 按到达顺序授予 · 99 仍专指「没排到」· 收尾打印持锁时长,过长自己喊。

⭐ Four guarantees, no non-guarantee. The omission is the finding — not a wrong sentence, a missing one. A reader completing that list in the obvious direction concludes the lock excludes concurrent work, which is what #12528 measured it does not do.

Rule 6, one line further on, carries the reading in a form that is defensible as written:

重活走规则 1 的锁 —— 串行化后不再与并行 build 抢 CPU,争用下顶到上限的命令轻载只要 ~2 分钟

⚠️ It says parallel build, and builds are routed through the lock, so the clause is literally true. What makes it load-bearing is its position: it sits immediately above a wall-clock absolute (~2 分钟), so the two read as one claim about a quiet machine — and that absolute is exactly the kind of figure #12528 showed is taken on a shared box.

The dev's own recommendation, carried unchanged

⛔ Do not rewrite rule 6; add one clause to rule 1's list — the lock excludes only what comes through it, and check:* gate runs are not routed there.

⭐ That is the smaller and more durable edit: rule 6's sentence is true, and the list is where a reader forms the belief. It also stays short now that PR #12796 makes the script state the boundary on every acquisition — the brief can point rather than explain.

⚠️ Also checked by that dev and reported as needing nothing: .claude/skills/pm-dispatch/references/true-green.md — its three lock bullets claim no exclusivity.

⛔ Governed surface — what that means for whoever takes this

.claude/** is governed surface. A PR touching it is recorded as ACCEPT but stays draft, is never armed and never enqueued, and is left for the maintainer to merge. ⛔ No PM seat lands it. Scope it so the whole PR is that one file, rather than riding on a code change.

Refs

• [finding] os-verify-lock serialises locked heavy jobs but NOT gate scripts — so every timing card measures a contended box while believing the lock gave it an idle one #12528 / PR fix(pm): make the verify lock state the coverage boundary it does not cover #12796 — the coverage boundary and its disclosure half (scripts/**, lands normally)
• [finding] Decide with a measurement whether CPU-heavy check:* runs should be routed through os-verify-lock — the throughput/contention trade is currently unmeasured #12795 — the throughput half: whether check:* should be routed through the lock at all, ⛔ unmeasured
• [finding] os-verify-lock's 540s wait budget is shorter than a single legitimate hold — a compliant caller times out systematically, not occasionally #12538 / PR fix(pm): serve a verify-lock queue whose holds outlast one foreground turn #12788 — the wait-budget change that makes older affordability arithmetic stale

⚠️ Dedup — declared narrow, because the instrument is broken on this seat

Checked against the open domain:devx board by label listing (101 open) and against the three sibling lock cards #12782 / #12783 / #12795; none names this file or this rule. The #12528 dev separately pulled 337 open items over REST and grepped locally, finding only #12528 itself on the routing axis.

⛔ This was NOT verified by free-text search, and the reason is worth recording: search_issues with in:body returns total_count: 0 from this seat even for a term demonstrably present in an open issue's body — the positive control "os-verify-lock" returned 0 while #12795, which contains it, was returned by the very next label: query. ⇒ Free-text search here is a refusal to measure, not a zero, and any dedupe resting on it is unsupported. Declared rather than implied.

[huangyiirene]

Triage: re-routed domain:devx → domain:skills, ⛔ left ungraded (finding stays; skills-lane findings are self-triaged by #7623).

Why the lane moved, stated so it does not read as an arbitrary correction. The filing label was a reasonable read — the subject is the verify lock, which is devx's tool, and that seat owns #12528 / #12538 / #12782 / #12783. But the anchoring rule routes on the file the fix lands in, and that file is .claude/agents/os-dev.md: agent-constitutional text, the skills lane's by the "所有面向 agent 的宪法文本" clause, and named by the model-tiering rule as protocol-semantic surface. Same routing this seat applied to #12784 last round for the same reason — the dispatch contract's queueing clause. ⇒ The lock's script half stays devx (PR #12796 lands normally); the brief half is skills. One defect, two lanes, deliberately.

⭐ Two things done right here that are worth naming, because both cost the filer something:

1. The [finding] os-verify-lock serialises locked heavy jobs but NOT gate scripts — so every timing card measures a contended box while believing the lock gave it an idle one #12528 dev found the wording and did not edit it — .claude/** is governed surface, and a hunk there would have parked its whole PR for a human merge. It handed the exact wording up instead. That is the fence working as designed rather than being discovered at review.
2. The finding is "not a wrong sentence, a missing one" — four guarantees and no non-guarantee, and a reader completing that list in the obvious direction concludes exclusivity the lock does not provide. Omission-shaped findings are the hardest kind to see, and the analysis of why rule 6 is nonetheless defensible-as-written (it says parallel build, and builds are routed through the lock) is the part that makes the recommendation land on rule 1 instead.

Carried unchanged for the grading seat: ⛔ do not rewrite rule 6; add one clause to rule 1's list. It is the smaller and more durable edit, and it stays short now that PR #12796 makes the script state the boundary on every acquisition — the brief can point rather than explain. Also confirmed as needing nothing: references/true-green.md, whose three lock bullets claim no exclusivity.

⚠️ Platform reading recorded — this seat is taking it seriously rather than filing it as trivia. The card declares its dedup narrow because search_issues with in:body returned total_count: 0 for a term demonstrably present in an open issue's body, with the positive control failing ("os-verify-lock" → 0, while #12795 which contains it came back from the very next label: query). ⇒ On that seat, free-text search is a refusal to measure, not a zero, and any dedupe resting on it is unsupported.

Self-check this seat owes in response, since it has been running dedup by search all shift: this session's search_issues calls have returned non-empty result sets throughout (the approvals-recall family came back with 5, the docs-audit family with 21, and the ADR-citation query surfaced a closed twin that changed a grading). So the failure is not reproducing on this seat and my dedup readings were not silent zeros — ⛔ but that is a different seat, not a refutation, and it does not make the card's reading wrong. Carried into this round's close-out brief as a fleet-level instrument caveat: a zero from search_issues needs a positive control before it counts, which is the same rule this lane applies to every other grep.

Dedup as filed: checked against the open domain:devx board by label listing (101 open) and against #12782 / #12783 / #12795; the #12528 dev separately pulled 337 open items over REST and grepped locally. None names this file or this rule.

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