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.
npx skills add kyu-n/gdx-claude-skills --skill libgdx-bullet-physicsgit clone --depth 1 https://github.com/kyu-n/gdx-claude-skillsWrote 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.
[](https://agentmods.dev/skills/kyu-n/gdx-claude-skills/libgdx-bullet-physics)<a href="https://agentmods.dev/skills/kyu-n/gdx-claude-skills/libgdx-bullet-physics"><img src="https://agentmods.dev/badge/skills/kyu-n/gdx-claude-skills/libgdx-bullet-physics/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.
<a href="https://agentmods.dev/skills/kyu-n/gdx-claude-skills/libgdx-bullet-physics"><img src="https://agentmods.dev/badge/skills/kyu-n/gdx-claude-skills/libgdx-bullet-physics.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00080 | $0.04515 |
| Opus 5 | $0.00040 | $0.02257 |
| Sonnet 5 | $0.00016 | $0.00903 |
| Haiku 4.5 | $0.00008 | $0.00451 |
Grade A, and why
libgdx-bullet-physics scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 429 lines — stays where its author put it; the contents beside it link to each section on GitHub.
libGDX Bullet Physics Wrapper
Quick reference for the libGDX Bullet extension (com.badlogic.gdx.physics.bullet.*). This is a JNI wrapper around the C++ Bullet Physics library. All bt* objects are backed by native memory — the Java GC does NOT free them. Manual dispose() is mandatory.
Not supported on HTML5/GWT.
Gradle Dependencies
// core
api "com.badlogicgames.gdx:gdx-bullet:$gdxVersion"
// desktop
implementation "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-desktop"
// android (all four)
natives "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-armeabi-v7a"
natives "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-arm64-v8a"
natives "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-x86"
natives "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-x86_64"
// ios
implementation "com.badlogicgames.gdx:gdx-bullet-platform:$gdxVersion:natives-ios"
Initialization
Bullet.init(); // MUST call before any bt* class. Loads native library. Segfault otherwise.
Three overloads:
Bullet.init() // useRefCounting=false, logging=true
Bullet.init(boolean useRefCounting) // logging=true
Bullet.init(boolean useRefCounting, boolean logging)
Call once in create(), guard against double-init. Reference counting enables automatic obtain()/release() on shared objects (e.g., btCompoundShape child shapes).
Dynamics World Setup
Five objects, created in this order:
btDefaultCollisionConfiguration collisionConfig = new btDefaultCollisionConfiguration();
btCollisionDispatcher dispatcher = new btCollisionDispatcher(collisionConfig);
btDbvtBroadphase broadphase = new btDbvtBroadphase();
btSequentialImpulseConstraintSolver solver = new btSequentialImpulseConstraintSolver();
btDiscreteDynamicsWorld world = new btDiscreteDynamicsWorld(
dispatcher, broadphase, solver, collisionConfig);
world.setGravity(new Vector3(0, -10f, 0)); // takes libGDX Vector3, NOT btVector3
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.
- 12d ago First seen · 429 lines · 80 tokens per session scan A cb9398589aba
libgdx-bullet-physics is a skill published in the GitHub repository kyu-n/gdx-claude-skills (4 stars, last pushed 7mo ago), licensed MIT. It adds 80 tokens to every session and 4,515 once invoked, about $0.0004 per session on Opus 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.
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