[finding] REST `PATCH /issues/{n}` with `labels` and `type` in ONE body returns 500 and writes nothing; the same two fields as two writes succeed

[claude]

Filed by the domain:skills execution seat (session_01MCLBsUgfykL74aU716rzVK, GitHub os-sales) while self-triaging four lane findings at 2026-09-12T02:19Z. 平台事实变化 ⇒ one row in .claude/skills/pm-dispatch/references/platform-readings.md (the 写侧 rows), nothing else.

The measurement

PATCH /repos/objectstack-ai/objectstack/issues/17618 through bare REST (Authorization: Bearer $GITHUB_TOKEN, Content-Type: application/json, X-GitHub-Api-Version: 2022-11-28):

body	result
{"type": "Bug", "labels": ["domain:skills", "pm:queue", "priority:p1"]} — both fields in one write	HTTP 500 (Internal Server Error, no JSON body), nothing written: the read-back still showed finding + domain:skills and type: null
{"labels": [...]} alone, 30 s later	200, labels landed
{"type": "Bug"} alone, immediately after	200, type.name = Bug

Repeated on #17626 and #17742 (labels then type, two writes each): 200 + 200 both times. #17748 (type alone, labels untouched): 200. So the failing shape is specifically the two fields in one body, on a card whose type was null; ⛔ not measured: the same pair on a card that already carries a type, or labels + type where labels are unchanged.

Why it is a table row and not a shrug

The type field is the triage seat's fixed product and the label write is the seat's four-step (read → add/remove → write → read back). A seat that batches both into one PATCH to save a request gets a 500 with nothing written — recoverable, but a fresh session following the four-step will read the 500 as a rate or auth problem and retry the same body. One row that says 「labels and type: two writes, never one body」 with the failure shape and the date closes it.

Landing

• references/platform-readings.md — one row beside the existing issue-body / label write rows; the ratchet CEILINGS entry for that file rises by one under the standing ruledRaises ruling ([PM decision] skills lane batch 9 — platform-readings.md third increment: raise the ceiling by the measured +39 (358 → 397); and the MCP write-pool quota sentence collision #15275).
• Serial: behind the [finding] platform-readings.md's «backticks and bold are read» rule is TRUE of the PR-body gate and FALSE of the claim-comment limb — and it cost three of this seat's claim comments, two of which declared the opposite of the truth #17680 family PR (docs(pm): eleven platform readings into the fact table — 23 rows, 3 in-place corrections, ceiling 425 to 448 #17746) on the same file; it rides that PR only if it costs no second review round, else the next platform-readings.md PR.

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[claude]

Triage (skills-lane finding self-triage, filed and graded by the same seat): 平台事实变化, measured three times this fire (the table in the body; the failing write was the seat's own at 02:19Z). pm:queue · Task · priority:p3 — one platform-readings.md row, no gate, no behaviour change. Serial: platform-readings.md chain behind the #17680 family (PR #17746, in flight); rides that PR only if the dev confirms it costs no second review round, else the next PR on the file. Skills seat, session session_01MCLBsUgfykL74aU716rzVK, 2026-09-12T02:23Z.

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[claude]

Claim: PM loop round 1
Session: session_01MCLBsUgfykL74aU716rzVK (GitHub os-sales, skills seat), claimed at 2026-09-12T02:34Z
Branch: claude/issue-17680-platform-readings-rows (this card RIDES the #17680 family PR #17746 as one row — the family dev is resumed with it; no branch of its own)
Worktree: objectstack-issue-17680
Domain: domain:skills (self-graded p3 Task, comment 5642839413)
File surface (region-declared): .claude/skills/pm-dispatch/references/platform-readings.md — ONE row in the 写侧 issue-body cells (beside the PATCH /issues rows), ≤ 120 B, stating the failing shape (labels + type in one body → 500, nothing written; two writes succeed) and the unmeasured boundary; scripts/pm/check-skill-line-ratchet.mjs — the same CEILINGS entry +1 and the existing 2026-09-12 ruledRaises record's delta +1 (one increment, one record); ⛔ nothing else
Container & model: rides PR #17746 (opus build, skills-seat contract-tier review); governed ⇒ human terminal; Fixes #17754 added to that PR's body
Clause-②: no
Thread-read: 5642839413
Serial constraints cleared: the file's only open PR is #17746 itself (read 02:22Z); the rider was admitted in the family's review on the condition it costs no second review round — the same push carries a reviewer-authorised in-place correction, so it costs none; H17 index ∩ this face = ∅.

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[claude]

ACCEPT (family member): this card's admitted readings land on PR #17746 (head ceffb78b, Fixes #17754) as part of the folded platform-readings.md family; the review of record is the skills seat's ACCEPT 5642998995 on #17680 (per-item verification there). Governed ⇒ the PR waits at the human terminal with its four-piece; landing record here on MERGED. Skills seat, session session_01MCLBsUgfykL74aU716rzVK, 2026-09-12T02:55Z.

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[claude]

Landing record — PR #17746 (the folded platform-readings.md family) MERGED 2026-09-12T03:26:05Z through the merge queue as 1ce6ad41, merged by os-zhuang (the human merge is the review record for the governed surface; four-piece was on the PR; skills-seat ACCEPT 5642998995 on #17680). This card's share: the labels + type one-body 500 row (rider, admitted in the family review). Content verified on origin/main by git at 2026-09-12T03:26Z: the file is 449 lines, both review-round lines are present (git grep count 2), and the ratchet's CEILINGS entry reads 449. The card was closed completed by the PR's Fixes line at 03:26Z. Residue cleared in this same act: pm:dispatched and the assignee removed (closed cards carry no pm-state). Chain: platform-readings.md is free; #17569's rider rows ride the next PR on the file. Skills seat, session session_01MCLBsUgfykL74aU716rzVK, 2026-09-12T03:26Z.

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