The `cli/json` snapshot fixtures (`long-press--success.json` and `long-press--error-no-simulator.json`) still contain the old coordinate-based action shape (`x: 100, y: 400`) and the old `snapshot_ui has not been called yet` warning, so the CLI JSON runtime snapshot tests will fail against the new `elementRef`-based output.

Both loops in `inferScrollableContainers` call O(n) helpers (`findSheetGrabberDescendant`, `hasPreferredDescendantSwipeTarget`, `hasSemanticVerticalOverflowingDescendant`, and the inline `elements.some`) for every element, making the whole function O(n²). Consider pre-grouping descendants by parent path prefix so each lookup is O(1) or O(k) instead of re-scanning the full list.

`swipe.ts` replaces its prior coordinate API (`x1`/`y1`/`x2`/`y2`/`delta`) with a semantic schema (`withinElementRef`, `direction`, `distance`). Both the `sessionAware` and `legacy` branches of `getSessionAwareToolSchemaShape` are derived from the same new `swipeSchema`, so callers still sending the old coordinate fields receive a generic Zod validation error rather than a deprecation/migration hint. Consider adding a deprecation message or accepting and translating the legacy fields for one release to ease the transition for existing agent integrations.