/btw command shown in tips but does not exist

Bug Description

Claude Code displays a rotating tip during processing that says:

Tip: Use /btw to ask a quick side question without interrupting Claude's current work

However, /btw is not a recognized command and does not work when typed.

Steps to Reproduce

1. Run Claude Code and trigger a long-running operation (e.g., multiple parallel agents)
2. Wait for the "Kneading..." phase where tips rotate
3. Observe the /btw tip appears
4. Try to use /btw — it does nothing / is not recognized

Screenshot

The tip appears in the UI during agent execution:

● Kneading… (2m 52s · ↓ 9.7k tokens)
  └ Tip: Use /btw to ask a quick side question without interrupting Claude's current work

Expected Behavior

Either /btw should work as described (ask a side question without interrupting current work), or the tip should be removed from the rotation.

Environment

• Claude Code with Opus 4.6
• macOS (Darwin 24.6.0)