[BUG] Custom statusline with session name displaces 'View Teammates' tmux command for agent teams

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description

When using agent teams (CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1), the "View Teammates: tmux -L claude-swarm..." command appears in the bottom-right
of the terminal. However, when the session is renamed (e.g., via /rename), the session name gets added to the statusline, making it wider. This
causes the "View Teammates" command to be pushed off-screen or overwritten.

What Should Happen?

"View Teammates" command should always be visible when agent teams are active, regardless of statusline width or session name.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce

1. Configure a custom statusline (e.g., one that displays session name, branch, model, cost, etc.)
2. Rename the session (e.g., /rename my_session)
3. Create an agent team and spawn background agents
4. Observe: "View Teammates" command is NOT visible in bottom-right
5. Repeat steps 3-4 in a new session WITHOUT renaming
6. Observe: "View Teammates" command IS visible

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.84

Platform

Google Vertex AI

Operating System

Other Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_