[Bug]: Parent agent is not notified when a delegated child waits for an approval#22925

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Context

#15082 was closed on 2026-10-21 with this note: "One part is still open: parent-agent notification for approvals and sign-in requests. If that part still matters to you, please open a new issue for that part only." This is that part. PR #20928 ("notify parents when delegated children need approval") is open and appears to address it.

Steps to reproduce

1. On 0.1.2-nightly.20261021.3473 (macOS, desktop app), a Claude parent thread (claude-opus-5-5, full access) launches an async child with delegate_task on a second Claude provider instance (claude-opus-5-5, runtimeMode: full-access).
2. The child runs a Bash command that edits a file through a heredoc (python3 - <<'PY' ... PY). The CLI raises a command approval for it. The child's system/init event reports permissionMode: "bypassPermissions".
3. The parent's turn has ended. Nothing wakes it.

Expected behavior

The parent agent receives a notice that the child is blocked on an approval, with a link to the child thread, so it can tell the user or stop and relaunch the child.

Actual behavior

• The parent agent gets no notice. The user saw the "Subagent needs approval" banner and had to tell the parent agent about it in chat.
• task_status reports status: running, workState: working, pendingApproval: null, while t3_thread_read on the child reports pendingRequestCount: 1.
• The parent agent cannot approve or decline. Its only option is t3_thread_interrupt followed by t3_thread_send with new instructions.
• After the interrupt, the old approval stays pending and the banner stays on screen while the new run works normally (see #21935). The user then reported the same banner two more times, and the parent had to inspect the child to tell a stale request from a new one.

Impact

Major degradation or frequent failure

Workaround

The parent tells every Claude child to edit files only with Edit/Write, to write scripts to a file before running them, and to avoid heredocs and rm -rf with variables. Codex children in the same session did not raise approvals.