fix(composer): keep mention searches open across spaces

[omarbdri]

Typing a space in an active @ search closes the picker, even when matching file paths or thread titles contain spaces. Keep the active query across spaces so users can refine a multi-word name and accept it with Enter.

Fixes #15156.

The shared helper continues only an existing path trigger, tracking the previous prompt and query range. It allows edits within the query while preserving the surrounding text; moving the caret into existing prose closes the search before keyboard selection can replace that prose. Web/desktop use it while typing and when resolving keyboard selection; mobile uses it in the existing shared new-task/thread picker. Selecting a result, leaving the query, or crossing a newline/tab ends continuation. Web Escape dismissal remains effective across the rest of the multi-word query. Existing command/skill/PR triggers retain their detection rules.

This is submitted under the focused obvious-bug exception in CONTRIBUTING.md: spaced paths already serialize correctly and both file and thread matchers accept spaces; the active trigger loses its boundary before the existing matchers can receive the query. No contracts, server search behavior, provider routing, or reference serialization change.

Verification

Refreshed on 12 October 2026: rebased onto main at f498b3514b0b82e39e66c549468b2b889d5e520d. Both commits rebased cleanly; git range-diff confirms their patches are unchanged.

• 147 tests pass across the shared trigger, web trigger/cursor logic, mobile command-menu hook, and thread matching. Regression cases cover spaces, full replacement ranges, Escape, accepting a result, new triggers, selection boundaries, caret jumps into existing prose, edits before a preserved suffix, switching mobile drafts, and literal-answer initialization/reset. Original mutation checks showed that removing range validation fails the shared, web, and mobile caret-jump regressions, and disabling continuation reproduces the failing multi-word cases.
• Web, shared, and mobile package typechecks pass. Scoped lint has no errors and the same 48 warnings as current main on the same seven files; formatting and git diff --check pass.
• Original 3 October browser verification (before this rebase): built-in Browser panel against isolated dev state on macOS 27.0.1 / Node 24.13.1: the picker stays open at the first space; @Foreign Subsidiaries Motion Video/Script Notes narrows to one file; Enter inserts the complete reference; selection preserves an existing prose suffix; jumping the caret into that suffix closes the picker; Escape suppresses subsequent typing in the same query.
• Browser interaction was not rerun for the 12 October rebase; both commit patches are unchanged. The existing recordings below document the original implementation. Native iOS/Android and the Electron shell were not run separately. Mobile continuation is checked by the mounted hook tests. No agent turn was sent as part of verification.

vp test run packages/shared/src/composerTrigger.test.ts apps/web/src/components/chat/useComposerTriggerState.test.tsx apps/web/src/composer-logic.test.ts apps/mobile/src/features/threads/use-composer-command-menu.test.ts packages/client-runtime/src/composerThreadItems.test.ts
vp run --filter @t3tools/web typecheck
vp run --filter @t3tools/shared typecheck
vp run --filter @t3tools/mobile typecheck

Before / after

Synthetic workspace, folders, and files. Images are frames from the built-in Browser recordings because the snapshot tool failed.

Before recording · After recording, including Enter selection

Additional browser regression recording: selecting before existing prose, then closing on a caret jump

Model/harness: GPT-6.1 Sol through Codex in T3 Code for the original implementation and 12 October rebase; GPT-6.1 Sol through Codex desktop for the 9 October rebase. The earlier GPT-6 attribution was incorrect.

[macroscopeapp]

Approvability

Verdict: Approved at 0e8b4fd

Macroscope's review found this PR approvable — This is a focused fix to existing web and mobile composer behavior, preserving active @-mention searches across spaces while validating caret boundaries and draft resets. The shared helper and extensive regression tests keep the change localized, with no schema, deployment, security, billing, default-setting, or static-analysis impact.

No code changes detected at cfb9094. Prior analysis still applies.

^{You can add or adjust custom eligibility rules. Learn more.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 51a9acd and 28b8ab4.

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📒 Files selected for processing (7)

• apps/mobile/src/features/threads/use-composer-command-menu.test.ts
• apps/mobile/src/features/threads/use-composer-command-menu.ts
• apps/web/src/components/chat/ChatComposer.tsx
• apps/web/src/components/chat/useComposerTriggerState.test.tsx
• apps/web/src/components/chat/useComposerTriggerState.ts
• packages/shared/src/composerTrigger.test.ts
• packages/shared/src/composerTrigger.ts

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🚧 Files skipped from review as they are similar to previous changes (7)

• apps/mobile/src/features/threads/use-composer-command-menu.ts
• packages/shared/src/composerTrigger.ts
• apps/web/src/components/chat/useComposerTriggerState.test.tsx
• apps/web/src/components/chat/useComposerTriggerState.ts
• apps/mobile/src/features/threads/use-composer-command-menu.test.ts
• packages/shared/src/composerTrigger.test.ts
• apps/web/src/components/chat/ChatComposer.tsx

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📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

Walkthrough

Composer trigger detection now continues active path searches across spaces in web and mobile composers. The changes add shared continuation logic, integrate it into composer state, and add tests for multi-word searches and trigger closing conditions.

Changes

Composer Search

Layer / File(s)	Summary
Shared path-trigger continuation packages/shared/src/composerTrigger.ts, packages/shared/src/composerTrigger.test.ts	A new helper continues a previous path trigger to the cursor unless the trigger is removed, the cursor precedes it, or the query crosses a defined character boundary. Tests cover query ranges, replacement, cursor movement, and stopping conditions.
Web trigger state apps/web/src/components/chat/useComposerTriggerState.ts, apps/web/src/components/chat/useComposerTriggerState.test.tsx	The hook tracks the previous trigger and continues path searches when ordinary detection returns no match. Tests cover multi-word queries, dismissal, matching, and closing after selection.
Web composer integration apps/web/src/components/chat/ChatComposer.tsx	Prompt edits and active-trigger resolution now use the hook’s trigger detection function.
Mobile command-menu trigger state apps/mobile/src/features/threads/use-composer-command-menu.ts, apps/mobile/src/features/threads/use-composer-command-menu.test.ts	The mobile hook continues the previous path trigger when its owner is unchanged. Tests cover multi-word queries, draft changes, file acceptance, and text selection.

Priority: ➖ Normal

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

Change: Bug fix · Severity of issue fixed: Low

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Merge Risk: ⚪ Minimal · up to 28b8a

No concrete issue remains that would block merging the multi-word mention search change.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 51a9a

The change remains within composer search and replacement behavior, with existing reference-selection safeguards preserved. No introduced security issue was established, but complete draft-switch isolation has not been verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated effect is on composer-local query text, picker visibility, and replacement ranges in web and mobile. Inspected paths do not establish additional service authority, cross-environment access, or an expanded authorization boundary.

Trust Boundaries and Controls

• observed — Web replacement retains the custom-answer restriction and expected-text validation. Acceptance re-runs ordinary detection after replacement, and Escape suppresses continued candidates with the dismissed trigger kind and start position.

Resilience and Maintainability Implications

• observed — Web resets retained trigger state on pending-question transitions and draftId or activeThreadId changes. The inspected reset effect does not directly depend on the environment-scoped composer draft target, so complete target-switch coverage remains unresolved.

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Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 7 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Issue #15156 requires an active @ search to continue across spaces, filter the full file or thread query, accept a result, and preserve Escape dismissal. The shared continuation helper retains the q…
Out of Scope Changes check		The shared helper, web and mobile integrations, and tests all support issue #15156. The prompt reset changes preserve trigger state across existing composer flows. The reviewed changes show no unrelat…
Title check		The title clearly and concisely describes the main change: keeping composer mention searches open while users type spaces.
Description check		The description explains the problem, implementation, scope exception, affected clients, verification results, limitations, and UI evidence. It covers the required template information, including the …

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @packages/shared/src/composerTrigger.ts:
- Around line 58-60: Update the callers of the helper in composerTrigger.ts to
track the previous text and caret position, and allow the active query range to
grow past previous.rangeEnd only when the edit extends that query. Stop
continuation when the caret moves into existing same-line prose, preserving the
correct replacement range for the web composer and search range for the mobile
picker.

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📥 Commits

Reviewing files that changed from the base of the PR and between 31a9da1 and 51a9acd.

📒 Files selected for processing (7)

• apps/mobile/src/features/threads/use-composer-command-menu.test.ts
• apps/mobile/src/features/threads/use-composer-command-menu.ts
• apps/web/src/components/chat/ChatComposer.tsx
• apps/web/src/components/chat/useComposerTriggerState.test.tsx
• apps/web/src/components/chat/useComposerTriggerState.ts
• packages/shared/src/composerTrigger.test.ts
• packages/shared/src/composerTrigger.ts

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[omarbdri]

Rebased this onto current main (101f8b2) and resolved the composer/mobile test conflicts. The original bug still reproduces in upstream trigger detection: @Foreign opens a search, but adding a space closes it.

The refresh preserves the newer literal-answer handling and mobile workspace command-discovery retry tests. All 147 focused tests pass, along with web/shared/mobile typechecks, formatting, and git diff --check. Scoped lint has no errors and the same 48 warnings as current main.

I refreshed the PR description with these results. The existing browser recordings are from 3 October; I could not rerun browser interaction here because the repository-required T3 Browser panel tools are unavailable in this session. Native mobile and the Electron shell were not rerun separately.

Dismissing prior approval to re-evaluate 0e8b4fd

[maria-rcks]

Note

Written by claude-opus-5-5 on behalf of Maria

Hi! We are cleaning up open PRs, and this one appears to have been created with an older model (gpt-6). If this change is really important, we recommend rebuilding the PR with a newer model if possible.

[omarbdri]

Written by claude-opus-5-5 on behalf of Maria

this one appears to have been created with an older model (gpt-6).

The fix and subsequent rebase were both done with GPT-6.1 Sol. The “GPT-6” attribution in the PR description was incorrect. Could you reconsider?