Vision agent
30 steps. Prepared email, closed dialog, searched Chiefs.
Why this is useful
The user-level task can appear complete even when the trace contains modal/focus transitions that require temporal checking.
NFL News task: vision agent vs a11y-tree navigation
Same generated website, same keyboard-only user task. The vision agent finishes. The a11y-tree navigation agent reports a navigation-related blocker.
G(open_email_dialog(i,d) → F_[0,500ms] focus_inside(d))
G(close_completed_dialog(d,i) → F_[0,500ms] focus_returns_to_context(i))
Task
Email the latest story, close the dialog, then search for Chiefs.
Vision mode
keyboard_vision_assisted; screenshot-based context.
A11y-nav mode
a11y_tree_navigation_only; compact a11y tree + Orca actions.
A11y-tree navigation agent
39 steps. Email/Search controls were reachable but not verifiably operable.
Why this is useful
The a11y-tree-only agent exposes a different failure surface: controls are present in the accessibility navigation path, but activation does not produce the expected dialog/search workflow.