[Feature Request] Option to use git branch name as the session title (desktop app has no way to automate this)

Summary

Add a way — ideally a setting — to have a session's title/name in the session list default to the current git branch name, particularly in the desktop app where there is no launch-time equivalent of claude -n.

Problem

When working in one repo across many sessions, the auto-generated titles converge on near-identical summaries (e.g. ten sessions all titled some variant of "PR review"). The branch name is usually the most meaningful identifier for what a session was about, but today getting it into the title requires manually typing /rename <branch> in every session.

The CLI can be worked around with a shell wrapper (claude -n "$(git branch --show-current)"), but the desktop app has no equivalent hook point: sessions are started from the UI, so there's nowhere to inject a name at launch.

Current state

• /rename and claude -n set a display name interactively/at launch — manual only.
• The session picker shows the git branch as row metadata and supports Ctrl+B filtering, which helps but doesn't make titles scannable at a glance.
• The desktop session-management tooling (set_session_title) explicitly cannot rename the current session, so the assistant can't be asked to do it either.
• No settings.json option, hook output field, or env var influences title generation.

Suggested options (any one would solve it)

1. A setting such as sessionTitle: "branch" or a template, e.g. sessionTitleTemplate: "{branch}: {summary}", applied when a session starts inside a git repo.
2. Let SessionStart hooks set the session name via an output field (generalizes beyond git; overlaps with #72404).
3. A desktop-app preference: "Use git branch as session name for new sessions."

Related

• #81338 (configurable auto-title style — style/length, not source)
• #72404 (programmatic rename via hook/tool — would enable this as a workaround)

---
_Filed on behalf of the user with Claude Code assistance._