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Robot Actions — Remote Device Control

by com.robotactions.test
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device_two_finger_tap

Two-finger tap at (x,y) on an Android device — zooms OUT one step in Maps and is the accessibility/secondary gesture in several apps. Both fingers land either side of the point and lift without moving. Coordinates are PHYSICAL pixels.Pass input="hid" to require the virtual touchscreen: the gesture then reaches the app as real kernel input and fails loudly instead of silently falling back to injected input. That strict path used to be device_uhid_two_finger_tap, which stays callable under its old name.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
xYesTap centre X
yYesTap centre Y
gapNoPixels between the two contacts (default: 120)
udidYesDevice serial number (UDID)
inputNoInput path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / input / description
      Previous value: -"Input path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly."New value: +"Input path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly."
  2. Changed1 schema field changed
    • changedInput schema / properties / input / description
      Previous value: -"Input path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly."New value: +"Input path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly."
  3. Changed1 schema field changed
    • addedInput schema / properties / input
      Added value: +{
+  "description": "Input path. 'auto' (default) prefers the virtual touchscreen and falls back to injected input. 'hid' requires the virtual touchscreen and fails if the device does not provide one — use it when the gesture must be real kernel input or must fail loudly.",
+  "enum": [
+    "auto",
+    "hid"
+  ],
+  "type": "string"
+}
  4. Added

TDQS

A4.5/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full responsibility and does so well: it explains physical-pixel coordinates, finger placement, no-movement lifting, fallback behavior, strict kernel-input mode, and the legacy alias. This significantly exceeds what the schema alone provides.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is dense and front-loaded, with each clause serving a purpose. Minor formatting issues like 'PHYSICAL pixels.Pass' and a slightly run-on input-path sentence keep it from being perfect.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no output schema and no annotations, the description covers gesture mechanics, coordinate units, input modes, example use cases, and compatibility. It does not explicitly state the return value or error format, but that is not critical for a gesture tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description adds real value by clarifying that coordinates are physical pixels and explaining the auto/hid enum semantics, including 'fails loudly instead of silently falling back'. It does not add much beyond the schema for the 'gap' parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a precise action: 'Two-finger tap at (x,y) on an Android device'. It also gives concrete behavioral context (zooms OUT in Maps, accessibility/secondary gesture) that distinguishes it from related gestures like pinch or two-finger swipe.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides clear context for when to use the gesture and explains the strict input='hid' path versus the default auto fallback. It does not explicitly contrast with sibling tools like device_pinch or device_two_finger_swipe, but the use cases are concrete enough.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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