[BUG] tui: "default" setting is ignored when attaching to a session from agent view (claude agents)

Summary

When a session is attached from the agent view (claude agents), it is rendered in fullscreen mode regardless of the "tui": "default" setting in ~/.claude/settings.json. Sessions started directly via claude from a terminal honor the setting correctly.

Environment

• Claude Code version: 2.1.152
• OS: macOS 15.7.2 (Darwin 24.6.0)
• Relevant setting in ~/.claude/settings.json:

``json
{
"tui": "default"
}
``

Expected behavior

A session attached from the agent view should respect tui: "default" and use the classic (non-fullscreen) renderer — the same as sessions started directly via claude from a terminal.

Actual behavior

Sessions attached from the agent view always render in fullscreen mode, regardless of the tui setting in settings.json.

Reproduction

1. Set "tui": "default" in ~/.claude/settings.json.
2. Start claude from a terminal — session uses the default (classic) TUI as expected. ✅
3. Run claude agents to open the agent view.
4. Select a session and press Enter (or →) to attach.
5. Observe: the attached session is rendered in fullscreen mode. ❌

References

• Agent view docs: https://code.claude.com/docs/en/agent-view
• TUI / fullscreen setting: https://code.claude.com/docs/en/fullscreen
• Possibly related — tui setting documentation gap: #48851