docs-drift advisory is computed on the PR merge commit but never says which commit — a reader re-deriving in their own worktree gets a different list and reads the tool as lying

The Docs Drift Check advisory is computed against a tree the reader cannot identify from the comment, and the comment's own re-derivation instruction points at a different tree. A reader who follows that instruction can get a different list and conclude the tool emitted a wrong row.

Mechanism

.github/workflows/docs-drift-check.yml runs on pull_request, and actions/checkout@v7 checks out the merge commit for that event — base branch merged with the PR head. scripts/docs-audit/affected-docs.mjs then reads every page with readFileSync from that working tree (line 1849, docTexts) and emits a row only when a live regex matches that text.

So the advisory's page set is a fact about merge(base-at-run-time, head). Nothing in the posted comment names that commit. The comment closes by telling the reader:

Re-derive: node scripts/docs-audit/affected-docs.mjs --json origin/BASEREF

Run in a task worktree cut from an older main, that command reads a different content/docs tree. Any page that gained or lost an anchor token on main after the branch was cut produces a row the reader cannot reproduce — and the tool gives them no way to see that they are looking at a different tree.

Measured

On PR #9324 (origin/main, all numbers re-measured 2026-08-18):

tree	`viewName` in `content/docs/getting-started/build-with-claude-code.mdx`	row emitted?
PR head `4e5989b9a`	0	no
merged `a4c11ad48` (what CI read)	1	yes

The token was added to that page by 70775ccac (#9262, an unrelated docs commit) at 08:40Z; the PR branch was cut before that and the advisory ran at 13:51Z. Both runs are correct about their own tree. Re-running today's affected-docs.mjs on each tree reproduces exactly this split — the merged tree yields the seven-row advisory byte-for-byte, the head tree yields six rows with that one absent.

Cost

This is not hypothetical, and it is not cheap. The agent on #9190 read the advisory, grepped its own worktree, found nothing, and reported the row as false. That observation became #9331, filed as "the anchor set itself can go stale" — a defect class that does not exist in this tool, since the anchor set is derived fresh per run with no cache, index or snapshot anywhere. Confirming that took a full investigation round.

What would close it

State the commit the advisory was computed against, in the comment. affected-docs.mjs can emit it in its JSON (git rev-parse HEAD), and the workflow can render it beside the re-derivation command, so a reader who gets a different answer is told why instead of concluding the tool lied. That is the same "say what the run could not see" posture the file already takes everywhere else — this is one more thing the run knows and does not say.

Not claimed: that the row set is wrong. It is right for the tree it was computed on. What is missing is that the tree is unnamed.

Scope

Found while measuring #9331 and deliberately not fixed there: #9331's file surface is scripts/docs-audit/affected-docs.mjs and its self-test, and the rendering half of this lives in .github/workflows/docs-drift-check.yml. Filed unassigned for triage.

Related: #9331 (the card this falsified) · #9192 (the precision-first rework) · #9433 · #9503

Generated by Claude Code

Claim: PM loop round 7
Session: session_01XqDQYVU5smx29ts9pAErja · Branch: claude/issue-9519-advisory-names-its-tree · Worktree: objectstack-issue-9519 · Domain: domain:devx
File surface: .github/workflows/docs-drift-check.yml + scripts/docs-audit/affected-docs.mjs(仅新增 JSON 字段)+ 其自测 — stop on breach; explain in the report
Container & model: model=opus

面已实测空出:开着的 PR 中没有一个持有 docs-drift-check.yml;affected-docs.mjs 也已随 PR #9502(#9432)合并而释放。

本卡的两条测量我已独立复验

PR #9324 HEAD    4e5989b9a   viewName = 0   → 不出该行
merge commit     a4c11ad48   viewName = 1   → 出该行

以及 anchor 无缓存的机制:

affected-docs.mjs:1849  const docTexts = handwritten.map(doc => readFileSync(...));
affected-docs.mjs:1863  ... if (re.test(docTexts[i])) docs.push(i);

⇒ 卡片的机制描述成立,不需要重新推导前提。这是本轮少数几张「前提已被上一位 dev 端到端测过」的卡。

Generated by Claude Code

fix(ci): docs-drift advisory names the tree it was computed on (#9519)

os-dev-report

{
  "issue": 9519,
  "status": "done",
  "branch": "claude/issue-9519-advisory-names-its-tree",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/9524",
  "premise_still_valid": true,
  "summary": "affected-docs.mjs now emits computedOn = { head, headParents, diffBase, dirty }, and docs-drift-check.yml renders it as a collapsed 'Which tree this was computed on' section beside the re-derivation commands, which are pinned to diffBase instead of origin/BASEREF. Three design points were settled by measurement rather than by the card's suggestion: (1) `git rev-parse HEAD` alone is NOT enough — refs/pull/N/merge is ephemeral, so headParents is emitted as the durable handle; measured on a live refs/pull/9459/merge that parent 1 is the base and parent 2 is the PR head, and because that ordering is GitHub's convention rather than git's, the renderer CHECKS it against context.payload.pull_request.head.sha and leaves the pair unlabelled when the payload cannot confirm it. (2) The row set depends on TWO commits: diffBase publishes the three-dot merge-base the mapper had already resolved, not sinceRef re-read at emit time — re-resolving origin/main would have reproduced the same moving-name trap one field down. (3) dirty is the field's own correctness guard: the tool reads the working tree, so with uncommitted changes present the sha does not identify what was read, and a sha that misidentifies the tree is worse than no sha. PM assumption 'purely additive' — CONFIRMED, nothing on the derivation path was touched. NOTE for the record, not a defect: the card cites a4c11ad48 as 'the merge commit CI read', but that commit has exactly ONE parent — it is the squash-merge on main, not the ephemeral refs/pull/9324/merge. The mechanism the card describes is unaffected and the split it measured is real; this is why the merge-ref shape was measured directly here rather than inferred from that sha. Deliberately left narrow: the non-JSON path-list mode still does not state the tree — the card's ask and file surface were the JSON plus its rendering.",
  "tests": "All at final commit 3254f8147 (git rev-parse --short HEAD), working tree clean, in a dedicated worktree.\n\nADDITIVITY (the PM's assumption, checked not asserted): ran the pre-change mapper (git show origin/main:...) and the patched one on three refs, full-JSON diff each time. origin/main~5 base=541b new=775b; origin/main~30 base=25571b new=25805b; origin/main~120 base=77414b new=77648b (107 editable rows, 421 anchors). In all three the ONLY diff hunk is '3a4,11 > \"computedOn\": {...}'. docs / releaseOwnedDocs / anchors / detail / packageMentionDocs / changedPackages / anchorlessChanges and every summary string byte-identical.\n\nREPRODUCTION PROOF (the actual goal — the reader can reproduce): git worktree add --detach at real merge commit e2634384281134eae5ba291bb196c626727a2b21 (refs/pull/9459/merge). CI-style run `--json origin/main` -> 13 docs, 6 anchors. The command this PR now emits, `--json 097fe96e1228f7da71f87e8f5ed95ae2739b53f1`, from a clone whose origin/main sits well past that merge base -> 'docs identical true / releaseOwnedDocs identical true / anchors identical true / detail identical true / packageMentionDocs identical true / changedPackages identical true / anchorlessChanges identical true'.\n\nRENDERING — SIMULATED, NEVER SEEN LIVE. A pull_request run cannot be triggered from here; the comment on PR #9524 will be the first real render. Method: the `Comment on PR` step's script was EXTRACTED FROM THE YAML with a python yaml parser and executed under stubbed require/github/context/core, so the shipped source ran rather than a retyped copy. Seven inputs: (A) real refs/pull/9459/merge 13 rows -> section rendered, both parents labelled; (B) capped 107 rows -> rendered, capped re-derivation pinned to diffBase; (C) anchors but zero pages -> rendered; (D) no anchors at all -> NOT rendered (no opinion to disagree with; every byte here is relayed per #9037); (E) computedOn absent -> loud one-line warning, never silence; (F) dirty:true -> uncommitted-changes warning beside the sha; (G) single-parent HEAD with no payload match -> parents left unlabelled, no guessed base/head. TWO RENDERING DEFECTS WERE FOUND AND FIXED THIS WAY: branch C said 'Every page above was read from ...' with no pages above (now 'This run read content/docs from ...'), and branch E's closing blockquote pointed at a section that branch does not render.\n\nSELF-TEST 220 -> 233: '✓ affected-docs self-test: 233 cases pass.' (12 shape cases on the pure shaper computedOnFrom + 1 presence pin that scans the emitter source). REVERSE VERIFICATION, run from the COMMITTED state, restored with `git checkout HEAD -- <path>` and porcelain confirmed clean each time; predicted direction red, observed red in all three: (1) delete `computedOn: computedOnIdentity(),` from the emitter -> '✗ self-test \"the emitted JSON actually carries `computedOn`\" ... expected emit=true, got false', failed (1 case) — and critically the 12 shape pins stayed GREEN, which is exactly why the presence pin exists; (2) collapse a failed dirty probe to false -> '✗ ... \"could not tell\" is not \"checked, clean\" ... expected null, got false'; (3) slice(0,1) the parents -> '✗ a merge commit keeps BOTH parents, in order ... got [\"097fe96e...\"]'. Back to 233 green after restore.\n\nSCOPE RULING #5 PROVED, not eyeballed: from the '── Delivery, and ONLY delivery, tolerates platform weather (#9373)' comment (old line 199 / new line 302) to EOF, `diff` of origin/main against this branch is EMPTY. The 503/5xx tolerance logic is byte-identical.\n\nGATES: derived from the ACTUAL changed paths with `node scripts/pm/dispatch-gates.mjs .github/workflows/docs-drift-check.yml scripts/docs-audit/affected-docs.mjs` (7 families), run after the final commit, all green: check:docs-audit-scope (22 + 233 cases, 179 docs in sync, 9 release-owned read-only), check:node-version (28 setup-node steps / 25 workflows), check:required-contexts, check:shard-attestation (92 assertions), check:workflow-status-functions (34 assertions, 25 workflows, 44 jobs), node scripts/docs-audit/check-affected-docs.mjs (233 cases), plus check:nul-bytes (any-edit family the path derivation did NOT name — 75 assertions, 6141 files, no raw control bytes). Also scanned the two edited files directly with `grep -naP '[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]'` -> clean. YAML re-parsed with python yaml.safe_load after every edit.\n\nLABEL: skip-changeset applied via the true-append REST path (POST /issues/9524/labels with $GH_TOKEN) — no read-union fallback was needed. READ BACK from GET /pulls/9524: labels ['size/m', 'skip-changeset'] (the bot's size label and mine both present), draft=True, base=main, head_sha=3254f8147, body first line 'Fixes #9519', footer intact in session-URL form.",
  "open_questions": [],
  "out_of_scope_findings": []
}

Generated by Claude Code

✅ ACCEPT — PR #9524

PR 9524  head=3254f8147  draft=True  base=main  files=2  +228/-4
labels: ['ci/cd','size/m','skip-changeset']
body first line: 'Fixes #9519'
files: ['.github/workflows/docs-drift-check.yml', 'scripts/docs-audit/affected-docs.mjs']
gates(按名取最新): names=21  pending=['Lint & Repo Gates','TypeScript Type Check']  non-green=none

0. ⛔ 先更正我自己的一处错误断言

dev 在报告里标出:卡片(以及我)引用的 a4c11ad48 被称为「CI 读的那个 merge commit」,但它只有一个父提交。我自己核了:

a4c11ad48  parents=1  parent: 326f5de23
4e5989b9a  parents=1  parent: 739fe5b79

⇒ 它不是 refs/pull/9324/merge,是 main 上的 squash-merge。 我在 #9331 的验收评论里、以及本卡的认领评论里,两次把这个 sha 断言为「merge commit」并说自己复验过。那个措辞是错的。

⚠️ 但要说清楚什么没有变:两个 sha 是两棵不同的树,viewName 计数 0 vs 1 的分裂是真的,#9331 的结论(advisory 没说谎、reporter 也没说谎、他们在读不同的树)完全不受影响。错的只是我给其中一棵树贴的标签。

⭐ 而 dev 的处理方式正是该有的:没有从那个 sha 推断 merge-ref 的形状,而是直接去量了一个活的 refs/pull/9459/merge —— 那个确实有两个父。⇒ 机制成立,只是不能用那个 sha 当证据。从一个承载不了该结论的读数上下结论,这次是我。

1. 三个设计点都由测量定,不是照卡片写

(1) 只打印 git rev-parse HEAD 不够 —— 我在派发里提出这个疑虑,实测坐实:refs/pull/N/merge 是短命的,读者日后 checkout 不到。⇒ 改为发布 headParents 作为耐久句柄。

⭐ 而且父序没有被当成常识:在活的 merge ref 上量到 parent 1 = base、parent 2 = head,但因为那是 GitHub 的约定而非 git 的,渲染器会拿 context.payload.pull_request.head.sha 核对一遍,核不上就不给这对父提交贴标签。⇒ 宁可不标,也不猜。

(2) 行集依赖两个 commit,不是一个 —— 发布的是 mapper 已经解析出的三点 merge-base diffBase,而不是在输出时重新读 sinceRef。⭐ 理由很关键:重新解析 origin/main 会把同一个「移动的名字」陷阱在低一层原样复制一遍。

(3) dirty 是这个字段自己的正确性守卫 —— 工具读的是工作树,所以有未提交改动时那个 sha 并不标识被读到的东西,而一个指错树的 sha 比没有 sha 更糟。

2. 「纯增量」我要求验证而非声称,验了

三个 ref 上跑改动前后的 mapper 做全 JSON diff:

origin/main~5    base=541b    new=775b
origin/main~30   base=25571b  new=25805b
origin/main~120  base=77414b  new=77648b   (107 行 / 421 anchors)

三次唯一的 diff hunk 都是 3a4,11 > "computedOn": {...}。docs / anchors / detail / packageMentionDocs / changedPackages / anchorlessChanges 以及每一条 summary 字符串逐字节相同。⇒ 行集未动,裁决 4 遵守。

3. ⭐ 真正证明了目标 —— 读者能复现

不是「打印了一个 sha」,而是证明照着新指令跑能得到同一份清单:

在真实 merge commit e26343842(refs/pull/9459/merge)上建 detached worktree,CI 式跑法得 13 docs / 6 anchors;然后从一个 origin/main 已经远远超前的克隆里,跑本 PR 现在会输出的那条命令:

docs identical true / releaseOwnedDocs identical true / anchors identical true
detail identical true / packageMentionDocs identical true
changedPackages identical true / anchorlessChanges identical true

⇒ 我在派发里说「让读者能复现才是目标,打印 sha 只是手段」。这就是那个目标被直接测出来了。

4. 渲染:明说没见过实况,并用从 YAML 里抽出来的真源码模拟

我要求「说清楚你怎么验的,别暗示见过实况」。做到了,而且方法比我预期的严:用 python yaml parser 把 Comment on PR 步骤的 script 从 YAML 里抽出来、在打桩的 require/github/context/core 下执行 ⇒ 跑的是将要发布的源码,不是重打一遍的副本。

七个输入分支,其中三个尤其对:

(D) 完全没有 anchor ⇒ 不渲染(没有意见就没有可反对的东西);
(E) computedOn 缺失 ⇒ 一行响亮警告,绝不静默;
(G) 单父 HEAD 且 payload 对不上 ⇒ 父提交不贴标签,不猜 base/head。

⭐ 这个方法当场抓到两个渲染缺陷:分支 C 在没有任何页面时仍说 "Every page above was read from …";分支 E 的收尾引用指向一个该分支根本不渲染的小节。⇒ 模拟不是走过场。

5. 反向验证三条,而且第一条解释了自己为何存在

自测 220 → 233。三次消融全部按预测转红:

删掉 computedOn: computedOnIdentity(), ⇒ presence pin 红,而 12 条 shape pin 全绿 —— ⭐ 这正是 presence pin 存在的理由:只钉形状的话,字段整个消失也测不出来;
把失败的 dirty 探测折叠成 false ⇒ 红,"could not tell" is not "checked, clean";
slice(0,1) 砍掉一个父 ⇒ 红。

裁决 5(不碰 #9373 的 5xx 容错)是证明的不是目测的:从那条 ── Delivery, and ONLY delivery… 注释到 EOF,与 origin/main 的 diff 为空。

6. 边界

非 JSON 的路径列表模式仍然不说明树 —— 明确记为「故意留窄」,因为卡片的诉求和文件面是 JSON 那一半。⇒ 不是遗漏,是划界。

Verdict: ACCEPT. 门禁收敛后武装。

Generated by Claude Code

fix(ci): docs-drift advisory names the tree it was computed on (objec…

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docs-drift advisory is computed on the PR merge commit but never says which commit — a reader re-deriving in their own worktree gets a different list and reads the tool as lying #9519

Mechanism

Measured

Cost

What would close it

Scope

本卡的两条测量我已独立复验

✅ ACCEPT — PR #9524

0. ⛔ 先更正我自己的一处错误断言

1. 三个设计点都由测量定,不是照卡片写

2. 「纯增量」我要求验证而非声称,验了

3. ⭐ 真正证明了目标 —— 读者能复现

4. 渲染:明说没见过实况,并用从 YAML 里抽出来的真源码模拟

5. 反向验证三条,而且第一条解释了自己为何存在

6. 边界

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docs-drift advisory is computed on the PR merge commit but never says which commit — a reader re-deriving in their own worktree gets a different list and reads the tool as lying #9519

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os-steve commented on Aug 18, 2026

本卡的两条测量我已独立复验

os-steve commented on Aug 18, 2026

os-steve commented on Aug 18, 2026

✅ ACCEPT — PR #9524

0. ⛔ 先更正我自己的一处错误断言

1. 三个设计点都由测量定,不是照卡片写

2. 「纯增量」我要求验证而非声称,验了

3. ⭐ 真正证明了目标 —— 读者能复现

4. 渲染:明说没见过实况,并用从 YAML 里抽出来的真源码模拟

5. 反向验证三条,而且第一条解释了自己为何存在

6. 边界

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