uloop-replay-input

name	uloop-replay-input
toolName	replay-input
description	Replay recorded PlayMode keyboard and mouse input. Use for exact gameplay reproduction, E2E runs, or consistent demos from JSON recordings.

uloop replay-input

Replay recorded keyboard and mouse input during PlayMode. Loads a JSON recording and injects input frame-by-frame via Input System with zero CLI overhead. Supports looping and progress monitoring.

Usage

# Start replay (auto-detect latest recording)
uloop replay-input --action Start

# Start replay with specific file
uloop replay-input --action Start --input-path scripts/my-play.json

# Start replay with looping
uloop replay-input --action Start --loop

# Check replay progress
uloop replay-input --action Status

# Stop replay
uloop replay-input --action Stop

Parameters

Parameter	Type	Default	Description
--action	enum	Start	Start, Stop, Status
--input-path	string	auto	JSON path. Auto-detects latest in .uloop/outputs/InputRecordings/
--no-show-overlay	flag	-	Hide replay progress overlay
--loop	flag	-	Loop continuously

Deterministic Replay

Replay injects the exact same input frame-by-frame, but the game must also be deterministic to produce identical results. If replay output must be compared across runs, read references/deterministic-replay.md before interpreting failures.

Prerequisites

• Unity must be in PlayMode
• Input System package (com.unity.inputsystem) must be installed; this tool only works with the New Input System.

Output

Returns JSON with:

• Success: Whether the operation succeeded
• Message: Status message
• Action: Echoes which action was executed (Start, Stop, or Status)
• InputPath: Path to recording file (nullable string; populated on Start only)
• CurrentFrame: Current replay frame index (nullable int)
• TotalFrames: Total frames in the recording (nullable int)
• Progress: Replay progress (nullable float in 0.0 – 1.0)
• IsReplaying: Whether replay is currently active (nullable bool)