Unity Primetween Design Agent Skill

PrimeTween - Design Rules

Advisory module. Rules are grounded in the PrimeTween 1.4.6 package installed through com.kyrylokuzyk.primetween.

> Mode: Documentation only — no REST skills to gate; load freely under any operating mode.

When to Load This Module

Load before writing or reviewing:

• Tween.Position, LocalPosition, EulerAngles, LocalEulerAngles, Scale, Alpha, Color, Custom, delay, or shake calls.
• Sequence.Create, Chain, Group, Insert, callbacks, or sequence cycles.
• Tween.Stop, Complete, StopAll, CompleteAll, PausedAll, progress, time scale, or manual update control.
• OnComplete, OnUpdate, zero-allocation callback overloads, or target-destruction handling.
• await tween, ToYieldInstruction, serialized TweenSettings, PrimeTweenConfig, or capacity tuning.

Critical Rule Summary

| # | Rule | Source anchor |

|---|------|---------------|

| 1 | PrimeTween uses static Tween factories. Its Tween handle is a struct, and a completed or stopped handle is dead and non-reusable; create a new tween to replay or reverse an animation. | Runtime/Tween.cs:53,256-264; readme.md “Controlling tweens” |

| 2 | Use Sequence.Chain for sequential work, Group for parallel work against the previous item, and Insert for absolute-time overlap. This naming differs from DOTween’s Append/Join vocabulary. | Runtime/Sequence.cs:154,193,202 |

| 3 | A Sequence has its own cycles, cycle mode, easing, update type, and unscaled-time settings at creation. Configure those on Sequence.Create, not through DOTween-style fluent setters. | Runtime/Sequence.cs:108 |

| 4 | Callbacks can bind a target explicitly with OnComplete<T> or sequence callback overloads. That avoids a capturing closure and lets PrimeTween suppress the callback if its target is destroyed. | Runtime/Tween.cs:365-382; Runtime/Sequence.cs:228-281 |

| 5 | PrimeTween detects destroyed Unity targets and exposes targeted warnings through PrimeTweenConfig. Do not assume a DOTween SetLink API exists; own a handle and stop it when your component is disabled when that is the intended lifecycle. | Runtime/Internal/PrimeTweenManager.cs:870-880; Runtime/PrimeTweenConfig.cs:56-87 |

| 6 | await tween and ToYieldInstruction() are supported, but both async state machines and coroutines allocate. For allocation-sensitive animation flows, prefer Sequence. | Runtime/Internal/AsyncAwaitSupport.cs; Runtime/Internal/CoroutinesSupport.cs; readme.md “Async/await” |

| 7 | TweenSettings and TweenSettings<T> are serializable configuration carriers for Inspector-authored tween values; use them instead of inventing a separate animation settings component. | Runtime/TweenSettings.cs:25-54; readme.md “Inspector integration” |

| 8 | PrimeTweenConfig is static runtime configuration. It has capacity, default ease/update type, warning controls, and manual-update APIs, but it is not a Resources settings asset. | Runtime/PrimeTweenConfig.cs:25-101 |

Routing to Other Modules

• Async control flow or cancellation policy → load async and unitask-design.
• Inspector-authored TweenSettings fields → load inspector.
• Tween-heavy performance analysis → load performance.
• Addressables-loaded targets or scene lifetime → load addressables-design.

Version Scope

This module targets PrimeTween 1.4.6. Its UPM package supports Unity 2018.4+, but Unity Skills itself maintains a Unity 2022.3+ baseline. Check the installed package version before relying on a newer factory overload or PrimeTween Pro feature.