snapshot_ui
Capture a UI state snapshot to verify screen changes after actions without loading full content. Use before taps or swipes to confirm visual updates efficiently.
Instructions
Takes a lightweight snapshot of the current UI state and returns a short token.
Use this before performing an action (tap, swipe, launch, key press) when you only need to confirm the screen changed afterward — not read its content. Pass the returned token to detect_ui_change as baseline_token. This avoids loading the full XML hierarchy into context unnecessarily. Do not use this when you need to read or interact with screen elements — use get_ui_hierarchy for that.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| device_serial | No | Android device serial (e.g. 'emulator-5554' or '192.168.1.10:5555'). Omit only when a single device is connected. If the tool returns a multi-device error: STOP. Present the device list to the user verbatim and wait for their explicit choice. Do NOT retry with a guessed or inferred serial — this is a hard requirement. Once the user provides a serial, use it for every subsequent call in this session. To switch devices mid-session, ask the user first. |