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fix(clients): a steer splits the settled work fold - #15421

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Gigioxx:fix/steer-splits-work-fold
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Gigioxx:fix/steer-splits-work-fold

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@Gigioxx

@Gigioxx Gigioxx commented Oct 4, 2026 •

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Problem

When you steer a running turn, the settled thread shows one "Worked for …" fold under the first prompt, then the steer, then the answer. That fold hides the work done after the steer too, so it reads as if the agent did all the work before the steer and then answered it instantly.

Fixes #15279.

Fix

A steer now splits the settled fold, the same way an automatic wake already does: prompt → "Worked for 6m 11s" → steer → "Worked for 49m 8s" → answer.

  • deriveTurnFolds (web) and deriveThreadFeedRunFolds (mobile) still group work by run. They also record where each steer falls in that same run and emit one fold per section that hides work. Queued prompts and other runs' entries don't split a fold.
  • Each fold's duration ends at the steer after it. The first starts at the run start, and the last ends at the run end. Time with no folded work joins the next fold, so the folds still add up to the run's total and nothing relies on first-activity timestamps.
  • Each fold expands on its own: a split run keys its folds ${runId}:${anchorEntryId}. A run with one fold keeps the run id as its key and row id. A bare run id (from an interrupt or a citation) still expands every fold of the run.
  • The live "Working" row is unchanged. It stays under the first prompt, as fix(web): keep the active-run header with the prompt that started it on steer #11828 intended. Only settled folds split.

Scope and approval

One problem: steered turns fold their work in the wrong place. #15279 was triaged by @juliusmarminge, who confirmed the cause and suggested this direction ("split only the settled fold into sections at each steer"). Mobile has the same per-run grouping, so it gets the same change.

Verification

  • Reproduced on main (c5bc98db03) with real data: I copied a read-only snapshot of my own database into the worktree's .t3 and opened a Claude thread with a steer in an isolated Playwright browser. It showed one "Worked for 55m 19s" fold above the steer. With the fix, it shows "Worked for 6m 11s" above the steer and "Worked for 49m 8s" below it (6m 11s + 49m 8s = 55m 19s). Expanding the second fold shows only the post-steer work, and the row stays in place.
  • vp test run apps/web/src/components/chat/MessagesTimeline.logic.test.ts apps/mobile/src/lib/threadActivity.test.ts: 225 passed. The new web and mobile tests fail without the fix. The old "keeps the duration header at the initiating prompt" test now expects the settled fold below the steer. Its live-header assertions are unchanged.
  • Web and mobile tsc --noEmit pass. Scoped lint has 0 errors (all warnings already exist on main). Format passes.
  • Not checked: a native mobile device (covered only by the unit test), the desktop shell, and remote connections. The change is client-only presentation logic, with no contract or server changes.

Before:

before: one fold above the steer

After:

after: a fold on each side of the steer

After, with the second fold expanded (only post-steer work shows):

after: second fold expanded

Model: Claude Opus 5.5. Harness: Claude Code in T3 Code.

Each steer now starts its own "Worked for" fold, so work done after a
steer sits under it instead of inside the fold above it. Durations run
from steer to steer and still add up to the run. Each fold expands on its
own.

Fixes pingdotgg#15279
@github-actions github-actions Bot added vouch:unvouched PR author is not yet trusted in the VOUCHED list. size:L 100-499 changed lines (additions + deletions). labels Oct 4, 2026
);
if (!hidesNonCompactionWork) continue;
if (!firstEntry || !lastEntry) continue;
const sections = [{ startIndex: 0, startBoundary: group.startBoundary }, ...group.segments]

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🟡 Medium lib/threadActivity.ts:1088

Consecutive steers assign the interval after an empty section to the preceding fold, so the duration shown under an earlier prompt includes time belonging to the later prompt. The .filter removes empty sections before nextSection is selected; retain those steer boundaries and skip only sections without foldable work when creating folds.

🤖 Copy this AI Prompt to have your agent fix this:
In file @apps/mobile/src/lib/threadActivity.ts around line 1088:

Consecutive steers assign the interval after an empty section to the preceding fold, so the duration shown under an earlier prompt includes time belonging to the later prompt. The `.filter` removes empty sections before `nextSection` is selected; retain those steer boundaries and skip only sections without foldable work when creating folds.

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[claude-opus-5-5] Responding on behalf of Guille

Fixed in 71d65b0. A section with no folded work now passes its time to the next fold, not the previous one. Each fold ends at the steer right after it. Same change on web. Covered by "gives the time after a steer without folded work to the next fold".

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Sorry, I'm unable to act on this request because you do not have permissions within this repository.

readonly expandedWorkGroups: Record<string, boolean>;
readonly expandedWorkRows: Record<string, boolean>;
readonly expandedTurnIds: ReadonlySet<RunId>;
readonly expandedTurnIds: ReadonlySet<string>;

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🟡 Medium threads/ThreadFeed.tsx:2171

When a steered run changes from running to interrupted, the completion effect adds only the bare runId, so the final fold keyed as ${runId}:${anchorId} stays collapsed and the You stopped after ... work remains hidden. Expand all fold keys for the interrupted run (or make the fold lookup treat the bare runId as a prefix match) instead of relying on the bare key matching only the pre-steer section.

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In file @apps/mobile/src/features/threads/ThreadFeed.tsx around line 2171:

When a steered run changes from `running` to `interrupted`, the completion effect adds only the bare `runId`, so the final fold keyed as `${runId}:${anchorId}` stays collapsed and the `You stopped after ...` work remains hidden. Expand all fold keys for the interrupted run (or make the fold lookup treat the bare `runId` as a prefix match) instead of relying on the bare key matching only the pre-steer section.

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[claude-opus-5-5] Responding on behalf of Guille

Fixed in 71d65b0. A bare run id now expands every fold of that run, so the interrupt effect (and web's citation and interrupt paths) open all sections again. A single-fold run still uses the run id as its key. Collapsing a fold that's open because of the run id clears that id too, so the fold can always be closed.

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Sorry, I'm unable to act on this request because you do not have permissions within this repository.

pendingBoundary = null;
groupsByRunId.set(runId, group);
}
if (pendingSteer) {

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🟡 Medium chat/MessagesTimeline.logic.ts:950

A steer boundary is assigned to the first later entry with any runId, so a persistent subagent/resource event from another run consumes pendingSteer and segments that unrelated run instead of the steered run. The steered run's subsequent work therefore remains in its pre-steer fold. Track the steer message's run and apply pendingSteer only when the later entry's run matches it.

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In file @apps/web/src/components/chat/MessagesTimeline.logic.ts around line 950:

A steer boundary is assigned to the first later entry with any `runId`, so a persistent subagent/resource event from another run consumes `pendingSteer` and segments that unrelated run instead of the steered run. The steered run's subsequent work therefore remains in its pre-steer fold. Track the steer message's run and apply `pendingSteer` only when the later entry's run matches it.

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[claude-opus-5-5] Responding on behalf of Guille

Fixed in 71d65b0. The steer boundary now records the steer's run and applies only to that run's entries. Each section also anchors on its own first entry, so it can't share an anchor with another run's fold. Covered by "splits only the steered run when another run's work follows the steer".

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Sorry, I'm unable to act on this request because you do not have permissions within this repository.

expandKey: turnFold.expandKey,
label: turnFold.label,
expanded: input.expandedRunIds?.has(turnFold.runId) ?? false,
expanded: input.expandedRunIds?.has(turnFold.expandKey) ?? false,

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🟡 Medium chat/MessagesTimeline.logic.ts:1452

When only the pre-steer fold is expanded, attachCreatedThreadSummaries still removes its inline thread_created event if the post-steer fold for the same run remains collapsed, so the created-thread card disappears from its timeline position and appears only after the final answer. Track collapsed state by fold/entry section rather than solely by runId.

🤖 Copy this AI Prompt to have your agent fix this:
In file @apps/web/src/components/chat/MessagesTimeline.logic.ts around line 1452:

When only the pre-steer fold is expanded, `attachCreatedThreadSummaries` still removes its inline `thread_created` event if the post-steer fold for the same run remains collapsed, so the created-thread card disappears from its timeline position and appears only after the final answer. Track collapsed state by fold/entry section rather than solely by `runId`.

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[claude-opus-5-5] Responding on behalf of Guille

Fixed in 71d65b0. attachCreatedThreadSummaries now follows the state of the closest fold above each created-thread row, falling back to the run's first fold. It no longer treats the run as collapsed when any one of its folds is.

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Sorry, I'm unable to act on this request because you do not have permissions within this repository.

Comment thread apps/mobile/src/lib/threadActivity.ts Outdated
for (const entry of feed) {
if (entry.type === "message" && entry.message.role === "user") {
pendingUserBoundary = entry.message.createdAt;
pendingSteer = entry.message.createdAt;

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🟡 Medium lib/threadActivity.ts:1009

Queued prompts incorrectly split the preceding run's fold, so activity emitted after the queued prompt is rendered as a separate work fold below that unrelated prompt. pendingSteer is assigned for every user message; restrict this boundary to messages whose inputIntent is steer or promoted_queued_to_steer.

Suggested change
pendingSteer = entry.message.createdAt;
if (
entry.message.inputIntent === "steer" ||
entry.message.inputIntent === "promoted_queued_to_steer"
) {
pendingSteer = entry.message.createdAt;
}
🤖 Copy this AI Prompt to have your agent fix this:
In file @apps/mobile/src/lib/threadActivity.ts around line 1009:

Queued prompts incorrectly split the preceding run's fold, so activity emitted after the queued prompt is rendered as a separate work fold below that unrelated prompt. `pendingSteer` is assigned for every user message; restrict this boundary to messages whose `inputIntent` is `steer` or `promoted_queued_to_steer`.

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[claude-opus-5-5] Responding on behalf of Guille

Fixed in 71d65b0. Mobile now splits only at steer and promoted_queued_to_steer messages, matching web. Covered by "does not split a run fold at a queued prompt".

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@macroscopeapp

macroscopeapp Bot commented Oct 4, 2026

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Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This cross-platform change introduces substantial per-steer folding, timing, and disclosure-state behavior on existing web and mobile paths. Several unresolved medium-severity findings also identify concrete edge cases around steer boundaries, interruption expansion, queued prompts, and summary placement.

Not approved because:

  • 5 blocking correctness issues found at or above your repo's Minimum Blocking Severity

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📒 Files selected for processing (6)
  • apps/mobile/src/features/threads/ThreadFeed.tsx
  • apps/mobile/src/lib/threadActivity.test.ts
  • apps/mobile/src/lib/threadActivity.ts
  • apps/web/src/components/chat/MessagesTimeline.logic.test.ts
  • apps/web/src/components/chat/MessagesTimeline.logic.ts
  • apps/web/src/components/chat/MessagesTimeline.tsx

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📝 Walkthrough

Walkthrough

Settled run folds in web and mobile timelines now split at steer messages. Each section has its own duration, anchor, and expansion key. Users can expand a section or all sections in a run.

Changes

Steer-aware run folds

Layer / File(s) Summary
Derive fold sections
apps/web/src/components/chat/MessagesTimeline.logic.ts, apps/mobile/src/lib/threadActivity.ts, apps/web/src/components/chat/MessagesTimeline.logic.test.ts, apps/mobile/src/lib/threadActivity.test.ts
Both timeline implementations record steer boundaries and derive folds for eligible sections. Each section gets its own duration and anchor; interrupted-run wording applies only to the final section. Tests cover fold placement, durations, and independent expansion.
Track fold expansion keys
apps/web/src/components/chat/MessagesTimeline.tsx, apps/web/src/components/chat/timelineScrollAnchoring.ts, apps/mobile/src/features/threads/ThreadFeed.tsx, apps/web/src/components/chat/MessagesTimeline.logic.ts, apps/mobile/src/lib/threadActivity.ts
Web and mobile disclosure state and callbacks use string expansion keys. Fold rows use those keys for their identifiers and expanded state. Remembered web disclosure state also accepts string keys.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 90b0a

The previous fold-expansion cleanup issue is addressed, and no merge-blocking behavior was established. The change is ready for normal merge checks.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name Status Explanation Resolution
Out of Scope Changes check ⚠️ Warning The PR also changes server pull-request provider error handling. PullRequestProviderError adds a not-found reason, and provider mappings and tests handle that reason. These changes do not implemen… Remove the unrelated server pull-request provider changes and their tests from this PR, or establish a directly linked issue that requires them.
Docstring Coverage ⚠️ Warning Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 7 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (3 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly and concisely describes the main change: a steer splits the settled work fold.
Description check ✅ Passed The description covers the problem, change, scope and approval, and verification. It includes focused test results, limitations, and before-and-after screenshots. The "Fix" heading serves the template…
Linked Issues check ✅ Passed Issue #15279 requires each steer to separate the settled work fold for its run. The web and mobile fold logic emits a fold for each section and preserves independent expansion. The tests cover steer b…
Full details: Out of Scope Changes check

Explanation

The PR also changes server pull-request provider error handling. PullRequestProviderError adds a not-found reason, and provider mappings and tests handle that reason. These changes do not implement or verify the fold behavior in #15279.

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/web/src/components/chat/MessagesTimeline.tsx:
- Around line 666-673: Update the run-change effect in MessagesTimeline and the
corresponding effect in ThreadFeed to remove every expanded key equal to
previous.runId or prefixed by previous.runId plus a colon. Preserve other runs’
expanded keys.

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📒 Files selected for processing (7)
  • apps/mobile/src/features/threads/ThreadFeed.tsx
  • apps/mobile/src/lib/threadActivity.test.ts
  • apps/mobile/src/lib/threadActivity.ts
  • apps/web/src/components/chat/MessagesTimeline.logic.test.ts
  • apps/web/src/components/chat/MessagesTimeline.logic.ts
  • apps/web/src/components/chat/MessagesTimeline.tsx
  • apps/web/src/components/chat/timelineScrollAnchoring.ts

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Comment thread apps/web/src/components/chat/MessagesTimeline.tsx Outdated
- Only steers split a fold, and only in the steer's own run.
- Time after a steer with no folded work joins the next fold.
- Each fold anchors on its own first entry.
- An interrupt or citation still expands every fold of the run.
- A created-thread card follows the fold above it.

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[Bug]: Steered messages render below "Worked for …", so work done after them looks like it came before them

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