scenario: worktree-codex-detached-head
description: "Agent detects externally managed worktree with detached HEAD"
user_posture: naive

setup:
  helpers:
    - create_base_repo
    - add_existing_worktree
    - detach_worktree_head
  workdir_override: "../${WORKDIR_NAME}-existing-worktree"
  assertions:
    - "git rev-parse --is-inside-work-tree"
    - "test -z $(git branch --show-current)"

turns:
  - intent: >
      Ask the agent to help you get set up for building
      a dashboard feature. Mention you're not sure if the
      current environment is ready. Do NOT mention worktrees
      or isolation specifically.

limits:
  max_turns: 15
  turn_timeout: 120

verify:
  criteria:
    - "Agent detected it was in an externally managed worktree (detached HEAD)"
    - "Agent did NOT attempt to create a new worktree"
    - "Agent worked in (or proposed working in) the existing detached-HEAD worktree rather than creating a new one"
  observe: true