uloop-replay-input

Replay recorded input during PlayMode with frame-precise injection. Use when you need to: (1) Reproduce recorded gameplay exactly, (2) Run E2E tests from recorded input, (3) Generate demo videos with consistent input.

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Install this agent skill to your Project

npx add-skill https://github.com/hatayama/unity-cli-loop/tree/main/Packages/src/Editor/Api/McpTools/ReplayInput/Skill

SKILL.md

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

bash

# 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 true

# 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/`
`--show-overlay`	boolean	`true`	Show replay progress overlay
`--loop`	boolean	`false`	Loop continuously

Deterministic Replay

Replay injects the exact same input frame-by-frame, but the game must also be deterministic to produce identical results. See the "Design Guidelines for Deterministic Replay" section in the record-input skill for the full list of patterns to avoid (Time.deltaTime, Random.Range, physics, etc.) and their deterministic alternatives.

Output

Returns JSON with:

Success: Whether the operation succeeded
Message: Status message
InputPath: Path to recording file (Start only)
CurrentFrame: Current replay frame
TotalFrames: Total frames in recording
Progress: Replay progress (0.0 - 1.0)
IsReplaying: Whether replay is active