[jayleaton]

Problem

Desktop and web notifications (sound, OS notification, in-app toast, badge) fired for listed child chats, such as t3_thread_launch / create_threads children, named-agent delegate_task children, and tasks delegated in from linked environments. A captain running a fleet beeped on every child that finished or asked something.

Fix

Thread	Before	After
Top-level (no parent; forks count)	notifies	notifies
Listed child chat	notifies	silent
Task delegated in from a linked env	notifies unless its parent is listed here	silent
Side chat / subagent	silent	silent

• New hasParentThread in packages/client-runtime/src/state/threadShell.ts. It is true for a child, a subagent, a side chat, or any thread with delegatedFrom.
• ThreadNotificationCoordinator.observeThreads now skips on hasParentThread in place of isShownUnderParent. The coordinator no longer needs delegatedUnderParentAtom or its subscription.
• The badge counts the coordinator's tracked desktop notifications, so it follows the same filter with no separate change.

Nothing is lost. The server's DelegatedTaskQuestionReactor wakes a local child's direct parent for both questions and approvals, so the parent asks the user when it needs them, and the root then notifies. Subagent and side-chat requests still roll up to the parent through pendingSubagentRequests.

Proof

New case in ThreadNotificationCoordinator.badge.browser.test.ts: a root, a listed child and a delegated-in task each ask for input, then each complete.

• On main: 6 notifications, including Child and Delegated.
• On this branch: only Input needed: Root and Thread completed: Root, with a badge of 1.

vp run check:changed passes.

No visual change, so there are no captures.

Merge risk

Low and client-only. If a delegated-in task's parent environment is not connected to this client, that task no longer notifies on its own. That was the intent.

Opus 5.5 · Claude Code

🤖 Generated with Claude Code

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	21.5 KiB	21.5 KiB	0 B (0.0%)	24.4 KiB	✅
Codex	Live turn messages	1	1	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.9 KiB	21.9 KiB	0 B (0.0%)	24.4 KiB	✅
Claude	Live turn messages	1	1	0 (0.0%)	8	✅

Baseline: 6dec7c9 · PR result: fd5e477 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.