BLOCK until text or an element appears (or disappears with state:'gone') — use this instead of screenshot+sleep loops. Returns immediately when the condition is met, with elapsed time and a semantic diff of what changed. On timeout it returns matched:false plus the current UI tree (never throws) so you can see what IS on screen.

BLOCK until the UI stops changing (animations/loads settled). Volatile elements like clocks and spinners marked noisy are ignored. Use after navigation before reading the screen.

Get the current accessibility tree as structured text with [ref=eN] markers usable in tap/type_text. Much cheaper and more precise than a screenshot.

Semantic diff of the current UI vs a previous snapshot (default: the last one this server took). Answers 'what changed?' without comparing screenshots.

List iOS simulators and Android emulators/devices. Booted devices first; use the returned id with every other tool.

Launch an app by iOS bundle id or Android package name.

Terminate a running app.

Tap an element by [ref=eN] from get_ui_tree/wait_for, by selector, or by x/y. Refs re-resolve against the live tree; if the element is gone you get the current tree instead of a blind tap. With scroll:true, a selector that isn't on screen is searched for by scrolling through the content first. Returns a mini-diff of what the tap changed.

Type text into the focused field (optionally tap a field first via ref/selector). submit presses Enter/Return.

Swipe in a direction (from screen center) or between explicit points.

Press a device button (home, back [Android], volumeUp, volumeDown, enter).

Accept or dismiss a blocking alert/dialog (system permission prompts, 'Open in …?' sheets, in-app modals). Finds the right button from the current UI tree — no coordinates needed. Use buttonText for a specific button. Returns what was tapped and what changed; if no alert is present you get the current tree.

PNG screenshot — the fallback for purely visual checks (colors, images, layout polish). For text/structure, prefer get_ui_tree or wait_for: cheaper and more precise.