What is universal-tween-engine?

A reference for animating Java values with Universal Tween Engine 6.3.3. A tween changes a value gradually over time, such as moving or fading an object.

For creating single animations, sequences, parallel animations, easing effects, repeats, callbacks, and managed animation timelines.

It clarifies the library's method names, defaults, limits, callbacks, repeat behavior, and timing rules so animations behave as intended.

universal-tween-engine — Skill for Claude Code by kyu-n

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add kyu-n/gdx-claude-skills --skill universal-tween-engine

Clone the repo

git clone --depth 1 https://github.com/kyu-n/gdx-claude-skills

Made for: Claude Code.

Or install gdx-claude-skills, the plugin that ships this one along with the rest of its 28 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/kyu-n/gdx-claude-skills/universal-tween-engine/github.svg)](https://agentmods.dev/skills/kyu-n/gdx-claude-skills/universal-tween-engine)

Your own site

<a href="https://agentmods.dev/skills/kyu-n/gdx-claude-skills/universal-tween-engine"><img src="https://agentmods.dev/badge/skills/kyu-n/gdx-claude-skills/universal-tween-engine/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/kyu-n/gdx-claude-skills/universal-tween-engine"><img src="https://agentmods.dev/badge/skills/kyu-n/gdx-claude-skills/universal-tween-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,977 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00117	$0.02977
Opus 5.5	$0.00047	$0.01191
Sonnet 5.5	$0.00023	$0.00595
Haiku 4.5	$0.00012	$0.00298

Measured 2mo ago against content hash 0dba56e457d7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

universal-tween-engine scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/universal-tween-engine/SKILL.md · 241 lines

How it starts

The opening of the file, as written. The whole thing — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Universal Tween Engine (6.3.3)

Quick reference for consumers of aurelienribon.tweenengine. Covers factory construction, accessor registration, defaults/limits, semantic traps, callbacks, pooling lifecycle, and timeline composition. Full method signatures in references/api.md.

Defaults & Limits

Setting	Default	Override
Easing equation	`Quad.INOUT`	`.ease(equation)`
Path algorithm	`CatmullRom` spline	`.path(TweenPaths.linear)`
Combined attributes limit	3	`Tween.setCombinedAttributesLimit(n)` at startup
Waypoints limit	0	`Tween.setWaypointsLimit(n)` at startup
Callback trigger	`COMPLETE` only	`.setCallbackTriggers(flags)`
`Tween.call()` trigger	`START` (overrides default)	`.setCallbackTriggers(flags)`
Duration units	Unitless (matches `manager.update(delta)`)	N/A
Repeat count	0 (no repeat)	`.repeat(count, delay)` or `.repeatYoyo(count, delay)`
Auto-remove from manager	true	`TweenManager.setAutoRemove(tween, false)`
Auto-start on manager add	true	`TweenManager.setAutoStart(tween, false)`
Tween pool initial capacity	20	`Tween.ensurePoolCapacity(n)`
Timeline pool initial capacity	10	`Timeline.ensurePoolCapacity(n)`

Combined attributes limit = 3 means: tweening 4+ float values simultaneously (e.g., RGBA) throws at runtime unless you call Tween.setCombinedAttributesLimit(4) first.

Waypoints limit = 0 means: ANY .waypoint() call throws unless you call Tween.setWaypointsLimit(n) first.

Factory-Only Construction

Tween and Timeline have private constructors. All instances come from internal object pools via static factories.

// Tween factories — NEVER use new Tween()
Tween.to(target, tweenType, duration)      // animate from current to target values
Tween.from(target, tweenType, duration)    // animate from target values to current (reversed)
Tween.set(target, tweenType)               // instantly set values (duration=0)
Tween.call(callback)                       // timer/callback only — no target needed
Tween.mark()                               // empty beacon for Timeline sequencing

// Timeline factories — NEVER use new Timeline()
Timeline.createSequence()                  // children play one after another
Timeline.createParallel()                  // children play all at once

Read the full file on GitHub · 241 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/api.md 9.5 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 241 lines · 117 tokens per session scan A 0dba56e457d7

Subscribe to this mod's changes

universal-tween-engine is a skill published in the GitHub repository kyu-n/gdx-claude-skills (5 stars, last pushed 8mo ago), licensed MIT. It adds 117 tokens to every session and 2,977 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Code Game development Java Languages agent-skills claude-code-skills libgdx

universal-tween-engine next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
universal-tween-enginekyu-n/gdx-claude-skills	Skill	5	8mo ago	MIT	A	117	Claude Code
design-patternsdecebals/claude-code-java	Skill	770	8d ago	MIT	A	47	Claude Code, Codex
java-migrationdecebals/claude-code-java	Skill	770	8d ago	MIT	A	51	Claude Code, Codex
jpa-patternsdecebals/claude-code-java	Skill	770	8d ago	MIT	A	47	Claude Code, Codex
solid-principlesdecebals/claude-code-java	Skill	770	8d ago	MIT	A	73	Claude Code, Codex
test-qualitydecebals/claude-code-java	Skill	770	8d ago	MIT	A	45	Claude Code, Codex
concurrency-reviewdecebals/claude-code-java	Skill	770	8d ago	MIT	A	58	Claude Code, Codex