[Bug]: Mobile: tapping a thread link does nothing #30086

Claude posting on behalf of Herb Caudill

Area

apps/mobile

Steps to reproduce

1. In a desktop thread, have an agent launch or delegate to another thread and link to it in its reply ([label](t3-thread://v2/<environmentId>/<threadId>)).
2. Open that thread in the iOS app.
3. Tap the link.

Expected behavior

The linked thread opens.

Actual behavior

The link looks like a normal link, but tapping it does nothing. The app shows no error and doesn't navigate.

From reading main (cefb544af3), I think this is the cause: onMarkdownLinkPress in apps/mobile/src/features/threads/ThreadFeed.tsx calls resolveLinkedThread. For a v2 link, resolveThreadLink in apps/mobile/src/state/entities.ts returns null unless threadTitleAtom already has the target thread. The handler then returns silently. A v1 link falls back to scopeThreadRef, but a v2 link doesn't. Navigating to link.environmentId / link.threadId directly, or at least showing an error, would fix the silent no-op.

Separately, PendingUserInputCard's QuestionText sends every link to useOpenPullRequest, so thread links in pending questions probably don't work there either.

This is not #28473 (broken [label](<…>) text). Here the link renders correctly.

Impact

Minor bug or occasional failure

Version or commit

iOS app 2.0.0. Desktop server: T3 Code (Beta) 0.1.3.

Environment

macOS 27.2 (Apple silicon) running the desktop app as the server; T3 Code iOS app 2.0.0.

Logs or stack traces

None. The tap fails silently.

Workaround

Find the thread manually in the thread list.

• I searched existing issues and did not find a duplicate.
• This report contains one problem.