## Summary
- Claude Code v2.1.79 permanently shows `❯` in the input area even while actively thinking, causing `monitor_phase_loop` to false-positive on idle detection and kill working sessions after 90 seconds
- Replace `tmux capture-pane | grep ❯` with a Claude Code Stop hook (`lib/hooks/on-idle-stop.sh`) that writes a marker file only when Claude actually finishes responding
- Hook is installed per-worktree in `.claude/settings.json` by `create_agent_session`; marker cleaned up on inject/kill
## Test plan
- [x] Verified hook installs correctly in fresh worktree
- [x] Verified marker file appears only after Claude finishes responding (not during active thinking)
- [x] Verified live dev-agent session picks up fix and Claude works without being killed
- [x] Verified `agent_inject_into_session` clears marker before new work
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: openhands <openhands@all-hands.dev>
Reviewed-on: https://codeberg.org/johba/disinto/pulls/272
