Task

Simulate mouse input via Input System in Unity PlayMode, or dry-run a Game View coordinate against 3D physics without injecting input.

Workflow

1. When checking what a screenshot coordinate would hit in 3D physics before clicking, run uloop simulate-mouse-input --dry-run --x <x> --y <y> first (EditMode is fine; no Input System required)
2. Ensure Unity is in PlayMode (use uloop control-play-mode --action Play if not) before injecting real mouse input
3. For Click/LongPress: determine the target Game View input position from annotated SimX/SimY, raycast-grid InputX/InputY, or raw image pixels converted with ScreenshotToInputFormula
4. Execute the needed uloop simulate-mouse-input commands
5. Inspect the result with the lightest useful evidence: runtime state, logs, or a screenshot
6. When this input verifies a state transition, use Pause Point inspection from the section below as the standard frame proof
7. Report what happened and which evidence was used

Two rules while verifying:

• Do not touch the physical mouse or keyboard, and keep the OS pointer off the Unity window — real device input mixes into the same Mouse.current state this tool injects.
• Read the starting values you will assert against immediately before firing the input; a value measured earlier in the session may have changed.

Tool Reference

uloop simulate-mouse-input --action <action> [options]
uloop simulate-mouse-input --dry-run --x <x> --y <y> [--layer-mask <mask>] [--max-distance <distance>]

Parameters

Actions

Pause Point Inspection (Standard for E2E)

For standard frame proof when this input drives a state transition, follow the uloop-pause-point skill — it covers line placement and interruption semantics. Tool-specific note: if InterruptedByPausePoint: true, Unity is paused; read PressDeliveredToGame before retrying. Clear inspection-only pause points (uloop clear-pause-point --all) before final validation.

When to use this vs simulate-mouse-ui

All rows below assume the New Input System is installed.

Dry-run (3D physics hit check)

Use --dry-run to check what a top-left Game View coordinate hits in 3D physics before clicking. This path does not require PlayMode or the Input System package.

• Requires an active Camera.main.
• Uses Unity Physics raycasts, not UI EventSystem raycasts.
• --x / --y use the same top-left Game View input coordinates as Click/LongPress.

# Check what is under a screenshot coordinate
uloop simulate-mouse-input --dry-run --x 960 --y 540

# Check only specific layers
uloop simulate-mouse-input --dry-run --x 960 --y 540 --layer-mask 1

Examples

# Left-click at a representative Game View point (--button Right for right-click)
uloop simulate-mouse-input --action Click --x 400 --y 300

# Hold left-click for 2 seconds
uloop simulate-mouse-input --action LongPress --x 400 --y 300 --duration 2.0

# Scroll up (negative --scroll-y scrolls down)
uloop simulate-mouse-input --action Scroll --scroll-y 120

# Smooth camera pan right over 0.5 seconds
uloop simulate-mouse-input --action SmoothDelta --delta-x 300 --delta-y 0 --duration 0.5

Coordinate System

--x/--y use top-left Game View coordinates: pass AnnotatedElements[].SimX/SimY directly, convert raw screenshot pixels with ScreenshotToInputFormula, and never flip Y in the caller (the tool converts internally). Conversion formula, Device Simulator notes, and how the injected position reads back inside Unity are in references/output-and-coordinates.md.

Prerequisites

• For real mouse injection: Unity must be in PlayMode, and the Input System package (com.unity.inputsystem) must be installed; game code must read input via Input System API (e.g. Mouse.current.leftButton.wasPressedThisFrame).
• For --dry-run: an active Camera.main is required; PlayMode and the Input System package are not required.

Output

The response reports Success, Message, Action, the target/injected coordinates, InterruptedByPausePoint/PausePointHits, and — for --dry-run — the resolved camera (CameraName/CameraPath; check these first when a No physics hit looks wrong) plus the physics hit details. Field-by-field semantics are in references/output-and-coordinates.md. Verify visual outcome with a follow-up screenshot.