[Bug] Experimental agent teams sending unnecessary idle_notifications consuming tokens

Bug Description
It appears to me that CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS teammates send idle_notification every time they finish a turn, including tool calls. My main thread ended up killing a teammate over its idle spam. 😬

Claude itself took a look and noted that

Likely intent vs. actual behavior. The shape (summary, completedTaskId, completedStatus, failureReason) suggests these were meant to be informational status pings — show up in the mailbox view, maybe surface a notification, but not wake the lead's loop. The "submit anything unrecognized as a prompt" fallback in InboxPoller is the bug. Fixing it would be a one-line filter: bucket idle_notification into a no-op handler the way shutdown_approved already gets special treatment (it updates state and pushes to b only to be marked-read).

but of course I have no idea what this means because the code's minified.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.150
• Feedback ID: c7a1f234-b6ea-41db-b89b-7565b82dbabc

Errors

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