docs(agents): the os-dev terminal report carries its own session id

[claude]

Fixes #18264

The os-dev-report contract in .claude/agents/os-dev.md (:319 the comment; :360–:377 the JSON shape) gains ONE field, session, so every dev report carries in its TEXT the session_ id that the same file's :51 makes the attribution — 「归属 = 文本里的 session ID,非 user.login」 — and that the re-keyed H64 in scripts/pm/check-half-states.mjs reads. One governed file, two hunks, both inside the claimed REGION :319–:398 (PR #18250's :287 / :301 are untouched). check-half-states.mjs is not in the diff: P2 below is the measurement that says it does not need to be.

Landing: .claude/** is the rules layer of the governed surface — this PR stays a DRAFT; the seat hangs the four-piece after the report; an authorized approval lands it. skip-changeset: .claude/** publishes nothing (os-dev.md :297, the fast lane).

What changed — 403/403, every edited line at or under 120 bytes

Line numbers are on this branch at f60aba4b; B = bytes of the line as stored (LC_ALL=C awk '{print length($0)}'). The file spells the placeholder inside angle brackets, as the template always has; it is written here as ID.

Added, :366 (117 B) — the fifth identity field, right after pr:

"session": "session_ID — this run's harness-stamped id (transcript Claude-Session: line; subagent = parent's)",

Paid, :379 + :380 → :380 (106 B + 66 B → 119 B) — a tighter rewrite of the adjacent note pair under the JSON block:

before  - `premise_still_valid: false` = 你的核验证伪了 issue 的前提(规则 6):证据写进 `summary`。
before  - 那时 `pr` 为 null 或只圈存活的部分,PM 重新分诊。
after   - `premise_still_valid: false` = 核验证伪了前提(规则 6):证据进 `summary`,`pr` null 或只圈存活部分。

Why nothing operative was lost: the words that left are 你的 / issue 的 / 写 / 那时 / 为 / 的 and the clause 「PM 重新分诊」 — the rule-6 cross-reference, the evidence-in-summary instruction and the pr-null-or-surviving-part rule all survive; 「PM 重新分诊」 is the PM's act, not a dev instruction, and SKILL.md 〈报告契约〉 already states it (「当再分诊输入复核」).

wc -l = 403 before and after. pnpm check:pm-skill-ratchet on the head: ✓ check-skill-line-ratchet: .claude/agents/os-dev.md is 403 lines (ceiling 403; headroom 0).

The payment deviates from the suggested route, and says so

The ruling allowed 「a semantic no-op fold or a tighter rewrite of adjacent lines」. The fold was measured — open_questions :372–:374 collapses to one 111 B line, JSON-identical — and NOT taken: os-dev.md :292–:293 (「付行数棘轮的唯一合法货币是删内容:⛔ 不拿 re-wrap(折行合并)当筹行,新增以删减付账」「分界只问折行有没有为新增内容买行」) and the ratchet ledger (「re-wrap funding is refused per the 2026-08-17 rule」) refuse a fold that buys a line for new content, and the file's own conflict clause makes the file win over the dispatch prompt. The tighter rewrite is the route's second option and the file's currency at once.

Adjacent-pair measurement of the region, the way the SKILL.md precedent did it: no two adjacent prose lines concatenate under 120 B — :319+:320 = 223, :320+:321 = 200, :321+:322 = 207, :322+:323 = 202, :323+:324 = 210, :324+:325 = 178, :378+:379 = 198, :379+:380 = 172, :380+:381 = 160, :381+:382 = 203, :386+:387 = 231, :387+:388 = 225, :388+:389 = 183, :389+:390 = 171, :390+:391 = 210, :391+:392 = 221, :392+:393 = 195 (pre-edit numbering). So every 2→1 merge deletes words, and :379+:380 is the one pair whose deletable words carry no dev rule. Candidate prose lines for a SECOND added line (the no-MCP route and the subagent case, in Chinese) measured 134–141 B in every spelling tried, over the cap — which is why the whole instruction lives in the one JSON line.

P1 — how a dev actually obtains its id (measured in this run, mode:subagent)

route	reading
the harness attribution stamp in the transcript (the Claude-Session: line)	session_01HZfg2AwVX191qCizp88gQr
get_session with no argument (the Claude Code Remote MCP — not a GitHub tool)	session_01HZfg2AwVX191qCizp88gQr, title PM dispatch skills
env CLAUDE_CODE_REMOTE_SESSION_ID	cse_01HZfg2AwVX191qCizp88gQr — the same 24-character tail under a cse_ prefix
env CLAUDE_CODE_SESSION_ID	d13ed524-f222-55f1-9c04-ff395efe6ed7 — a UUID, not a session_01 form; H64 cannot read it
env CLAUDE_CODE_CHILD_SESSION	1

P1 is half-falsified. A subagent has no session_01… id of its own: every route the harness offers stamps the PARENT session's id — the same id it already puts on the dev's commit trailer and PR-body footer (os-dev.md :286 / :398). So in mode:subagent the only value that can be filled honestly equals the dispatching PM's id by VALUE; what the ruling's ⛔ protects — provenance: read your own stamp, never copy the prompt — still holds, and is what the line says (「this run's harness-stamped id」). The line is followable with no MCP (the transcript's Claude-Session: line, the source the footer already draws on) and names the subagent case so the field is fillable in both modes; get_session is the MCP-only second route and stays out of the rule line (byte budget; not universal). In mode:cloud the same routes return the dev session's own id. This PR's own report carries "session": "session_01HZfg2AwVX191qCizp88gQr" — the first live instance of the contract, and the first instance of the subagent case.

Premise correction, small: the ruling's 「the way the file already prescribes for the harness-stamped model field」 — os-dev.md has no such field; that discipline lives in references/contract-review.md :57 and references/platform-readings.md :369 (get_session → last_served_model). The analog inside os-dev.md is the PR-body session-URL footer, which is what the new line is anchored to.

P2 — the id in a JSON value clears H64; the reader is untouched

Replayed through the UNTOUCHED module at c053f748 (git diff e592b4b6 HEAD -- scripts/pm/check-half-states.mjs is empty): an os-dev-report comment, fenced JSON, only the platform's bare footer, created_at after the pin.

fixture	seatSignature	seatSessionIdPresent	h64SpeaksAbout	h64UnattributedSeatContent
WITH "session": "session_01HZfg2AwVX191qCizp88gQr"	report	true	false	null
WITHOUT the field (the control)	report	false	true	「comment 1 on this card carries an os-dev-report marker — a seat/dev artefact — and NO session id appears anywhere in its text…」

H52's devReportOpenQuestions reads {"marked":true,"parsed":true,"questions":[]} for BOTH bodies: the reader parses the object and reads open_questions alone, so an extra key is neither seen nor judged. seatSessionIdPresent tests the WHOLE body with SEAT_SESSION_ID, so a JSON value carrying the id attributes the report with no reader change — check-half-states.mjs stays out of the surface, as the ruling's measure-first clause asked.

P3 — one JSON, two copies

:319 is unchanged: the comment is 「同一段 JSON」 as the terminal message, so the field reaches both copies through the one payload. No second mechanism.

Gates — all on head f60aba4b

Roster derived with node scripts/pm/dispatch-gates.mjs --commands --repo objectstack-ai/objectstack, NO paths (stderr: change set 1 path vs merge base c053f748b; committed 1, working tree 0, untracked 0): 17 commands. Every one ran in the foreground with the exit captured by redirect before any pipe and recorded as command :: exit N:

• 16 exit 0 on the first pass; pnpm --filter @objectstack/lint run check:doc-formula-expressions exit 3 (PREREQUISITE NOT MET — @objectstack/lint not built), re-run exit 0 after pnpm exec turbo run build --filter=@objectstack/formula --filter=@objectstack/lint --concurrency=2 under scripts/pm/os-verify-lock.sh (VERDICT command-exit 0). No exit-3 reading is reported here as a measurement.
• --ran verdict: ✓ dispatch-gates --ran: 17 derived famil(ies) accounted for — 17 run, 0 NOT-MEASURED (a DERIVED zero — all 17 recorded an exit code and none of them is 3).
• Named by the route and not in the roster: pnpm check:pm-governed-prose exit 0 (2 instruction surface(s) name all 5 registered governed surfaces … and claim no others). check:pm-dispatch-gates was not derived for this change set, so it was not run.
• Verdict lines: the ratchet line above; check:pm-skill-id-lint: 27 file(s) clean (pattern /#[0-9]{3,}/g); check:agent-model-declared: os-dev.md → opus; check:nul-bytes exit 0; the pre-push hook's check:commit-card-trailers: 1 commit message(s) on this push carry no card relation and no model identifier in the trailer pair.

Reverse verification of the ratchet (one-off, not landed): with the fix committed, a 404th line was appended under a trap … EXIT INT TERM with an absolute repo root — marker count 0 → 1, mutated blob 6f16705b… against HEAD blob 7a914c94… — and the gate went RED (✗ … os-dev.md is 404 lines; the ratchet ceiling is 403, exit 1); git checkout HEAD -- .claude/agents/os-dev.md restored it: marker count 0, git diff HEAD empty, git status --porcelain empty, restored blob equal to HEAD's.

Acceptance notes

• noted, not filed: in mode:subagent the report's session equals the claim's id by value, so H64 clears but a reader cannot tell a subagent's report from its seat's own post by id alone; a per-subagent session_01… id would be a harness feature, not a contract line. 承接者:无.
• noted, not filed: os-dev.md :318 (outside this region) restates :17 and is the natural payment for the next line this section needs. 承接者:the next PR claiming :316–:318.
• noted, not filed: the ruling's model-field premise (above) — a wording slip in the dispatch prompt; no rule is affected.

维护者速读(草稿)

改了什么:开发 agent 的终报契约(.claude/agents/os-dev.md 的 JSON 模板)新增一个字段 session,要求每份报告的正文自带写它的会话 id;同一节的两行说明合并为一行付账,文件仍是 403 行,改动只落在 :319–:398。

为什么改:同一文件 :51 规定「归属 = 文本里的 session ID」,而报告模板里没有任何一行能承载这个 id,平台附加的页脚也不带它;刚落地的 H64 巡查按此把每一份 dev 报告都记成「无归属」。补上字段后报告自证归属,巡查行自然消失(P2 实测)。

风险与代价(含回滚):零运行时影响,不发布任何包;唯一代价是每份报告多一行。子代理模式下该 id 与派发席位相同(P1 实测),这是事实而非漏洞。回滚 = revert 这一个 commit。

席位意见:(留空)

你要做的:审阅并批准这张受管面 PR;落地由席位执行。

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[claude]

Contract review

Served-tier: CONTRACT_REVIEW_TIER
Head-sha: f60aba4b4385ea78ef8a06fccdd48c7da8f82429

Reviewing seat: domain:skills, in-seat review at the contract-review tier — get_session read at 2026-09-15T04:30Z: configured_model = session_context.model = last_served_model, the constant's tier, no fallback notice this round. Card #18264, claim 5675385331, report 5675559689; Clause-②: no on the claim and in the PR body.

① Derived judgments

• Accept set / public surface: none moves — .claude/agents/os-dev.md (+2/−2) against merge-base c053f748; nothing published; skip-changeset on the PR (read back with documentation, size/xs).
• Region: two hunks (@@ -363 the added JSON field; @@ -376 the payment), both inside the claimed REGION :319–:398; :287 and :301 (PR docs(agents): the contract-review carrier is the seat's to hang; --pair PR-NUMBER is the only spelling #18250's region) byte-identical to origin/main on the head, seat-diffed. The added line (:366, 117 B) puts a session field into the terminal-report JSON with the provenance rule in the value's own words — this run's harness-stamped id, read from the transcript's Claude-Session: line, subagent = parent's. Paid by a tighter rewrite of :379–:380 (106 B + 66 B → one 119 B line) keeping the rule-6 cross-reference, the evidence-in-summary instruction and the pr null-or-surviving-part rule; the dropped words are filler and the PM re-triage act, which lives in SKILL.md 〈报告契约〉. 403/403, no touched line over 120 B; check-skill-line-ratchet ✓, check:pm-skill-id-lint ✓, check-governed-prose ✓ on the head.
• The seat's P1 is HALF-FALSIFIED by measurement and the wording follows the measurement: in mode:subagent every harness route (the transcript stamp, get_session, the session env var) carries the PARENT session id and the subagent's own id is a UUID H64 cannot read, so the only honestly fillable value equals the dispatching seat's id by VALUE — the seat accepts the wording 「subagent = parent's」: the accountable session for a subagent's act IS the seat that dispatched it, the claim carries the same id, and the ruling's literal 「never the dispatching PM's id」 was satisfiable only in mode:cloud. The dispatch's model-field premise was also a slip (that discipline lives in contract-review.md :57 / platform-readings.md), corrected by the dev; the line anchors to the session-URL footer rule instead.
• P2 replayed by the seat on origin/main's check-half-states.mjs: a dev-report body WITH "session": "session_01…" → seatSessionIdPresent true, h64SpeaksAbout false; WITHOUT → false / true (the row fires). The script is untouched, correctly: H64 reads the whole body, and H52's report reader parses the JSON with the field present (the dev's replay). The report on [finding] os-dev.md: the os-dev-report comment carries no session id by contract, so the re-keyed H64 files every dev report as unattributed seat content #18264 is the first live instance of the contract and carries "session": "session_01HZfg2AwVX191qCizp88gQr".
• Gates 17 / 17 / 0 / 0 with exits captured by redirect (doc-formula-expressions after its prerequisite build under the verify lock); check:pm-governed-prose beyond the roster; the ratchet's reverse verification (a 404th line reds it) reported with the blob proof.

② Semver level

Not applicable — nothing published moves; skip-changeset measured (.claude/** is on the fast path).

③ Boundary flags

open_questions: none. Five declared deviations, each answered: (1) the payment took the tighter-rewrite option, not the 3-to-1 fold the dispatch suggested, because os-dev.md :292–:293 and the ratchet ledger refuse a re-wrap as currency — the file outranks the dispatch prompt; accepted, the right reading. (2) P1 half-falsified, wording as above; accepted. (3) one line added, not two — the Chinese route line measured 134–141 B in every spelling; accepted. (4) the dispatch's model-field premise slip — the seat's; accepted. (5) the PR body's footer follows the repo form; accepted. Governed (rules layer) ⇒ four-piece: needs-user-decision on the PR, 速读终稿 below, reviews requested; ⛔ not flipped ready by the seat before an authorized approval. Serial: PR #18250 (:287 / :301) is a disjoint region of the same file; the last to land merges origin/main first. Out of scope, recorded: in mode:subagent the report's session equals the claim's id by value, so the id alone cannot tell a subagent report from its seat post — a harness feature, not a contract line, no card; os-dev.md :318 restates :17 — the natural payment for the next line that section needs.

Implemented-by: claude/issue-18264-dev-report-carries-its-session-id
Reviewed-by: session_01HZfg2AwVX191qCizp88gQr

VERDICT: PASS

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[claude]

维护者速读(终稿)

改了什么:os-dev.md 终报 JSON 加一个字段 session(:366,117 字节):dev 报告在正文里带上本次运行经 harness 盖章的 session id(从 transcript 的 Claude-Session: 行读;子代理模式下 = 派发它的席位 id)。为守住 403 行天花板,把相邻两行(premise_still_valid: false 的两句说明)压成一行 119 字节,规则 6 引用、证据进 summary、pr 为 null 或只圈存活部分三条都在。

为什么改:os-dev.md :51 早已规定「归属 = 文本里的 session ID」,但报告契约本身没有任何一行能承载这个 id,平台在评论后只追加裸页脚。H64 重键(PR #18257)后,每条 dev 报告都是「有署名、无 session id」的半态——上次实测 10 行里有 7 行是 dev 报告。改契约比让 H64 豁免报告更对:豁免就是把已退休的前提留一半。

风险与代价(含回滚):纯规则文本,不碰发布包、不改 CI、行数不变;check-half-states.mjs 无需改动(H64 通读全文,带字段即清;H52 解析带字段的 JSON 无异常,已在 main 的模块上实测)。回滚 = revert 一个 PR。一处实测纠正:子代理拿不到自己的 session_01… id(harness 各路都盖父会话 id),所以报告里的值就是派发席位的 id——责任归属仍正确,但仅凭 id 分不出「dev 报告」与「席位贴」;这是 harness 特性,不立卡。

席位意见:建议批准。本席在 head 上亲核:两处改动都在认领区域 :319–:398 内、PR #18250 的 :287/:301 字节不变;新行 117 字节、付费行 119 字节且三条规则都在;棘轮 403/403、id-lint / governed-prose 绿;H64 带字段/不带字段两向复现;本单的 dev 报告本身已是新契约的首个实例。CI 在 head 上跑中(Lint & Repo Gates),绿后才由本席按裁决 C 落地;与 PR #18250 同文件不同区域,后落地者先合 main。

你要做的(一个动作):approve 本 PR。approve 后本席翻 ready + 入队。

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[claude]

Ruling-C landing provenance — skills seat, session session_01HZfg2AwVX191qCizp88gQr, 2026-09-15T06:59Z. Authorized APPROVED review 5206596891 by os-zhuang at 2026-09-15T06:58Z on head f60aba4b4385ea78ef8a06fccdd48c7da8f82429, not dismissed. Landing readings on that head: review of record 5675596117 (## Contract review, PASS, names this head; 速读终稿 5675596398; ACCEPT 5675596632 on #18264); check-clause2-carriers.mjs --pair 18273 exit 0 at 2026-09-15T06:58Z (C6-RECORD found, Served-tier: at tier, no widening tell); checks 18 success / 16 skipped, none failed (the Governed Surface Queue Guard re-runs on the merge group); mergeable: true, base e9091487 behind origin/main 842fa040 with no conflict, so no base merge is taken — the queue builds the group on the current main. The approver flipped the PR ready at 2026-09-15T06:58Z and enqueued it in the same stroke (added_to_merge_queue at 2026-09-15T06:58Z), so the seat's strokes reduce to clearing needs-user-decision (done through label-write.mjs, read back) and reading the enqueue event — no ccr/auto_merge PUT was needed. The landing is confirmed by the two readings (merged_at + git log origin/main carrying (#18273) single-parent) at the next wake, then #18264's residue is stripped and the landing record posted there.

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