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 chrisgliddon/bevy-skills --skill bevy-portinggit clone --depth 1 https://github.com/chrisgliddon/bevy-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/chrisgliddon/bevy-skills/bevy-porting)<a href="https://agentmods.dev/skills/chrisgliddon/bevy-skills/bevy-porting"><img src="https://agentmods.dev/badge/skills/chrisgliddon/bevy-skills/bevy-porting/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/chrisgliddon/bevy-skills/bevy-porting"><img src="https://agentmods.dev/badge/skills/chrisgliddon/bevy-skills/bevy-porting.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 | $0.00090 | $0.02620 |
| Opus 5 | $0.00045 | $0.01310 |
| Sonnet 5 | $0.00018 | $0.00524 |
| Haiku 4.5 | $0.00009 | $0.00262 |
Grade A, and why
bevy-porting 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 10d 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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Bevy 0.19 — Porting from other engines
When to use this skill
- Starting a port of an existing game from Unity, Unreal, Godot, Cocos, vanilla JavaScript / Phaser, Flash/SWF, Defold, Roblox, or GameMaker into Bevy 0.19.
- Evaluating feasibility — does my engine's feature X have a Bevy 0.19 equivalent?
- Deciding which subsystem to port first (we recommend: rendering + a single playable slice).
- Extracting asset and scene data from the source engine's project tree without needing the source engine installed — see the
scripts/policy below. - Replacing engine-specific build pipelines (Unity Build Settings, Unreal Build Configuration, etc.) with
cargo+Cargo.tomlfeatures.
Engine coverage
| Engine | Coverage | Scripts |
|---|---|---|
| Unity | Deep (8 subsystem refs) — see § Unity below | 4 Python extractors in scripts/unity/ |
| Unreal Engine 5 | references/unreal.md — Actor/Component → ECS, UMG → bevy_ui, Niagara/animation gaps | scripts/unreal/ue5_python_export.py (drops into UE5 editor) |
| Godot 4 | references/godot.md — node-tree → ECS, .tscn text format, GDScript → Rust |
scripts/godot/tscn_inventory.py (stdlib, no Godot needed) |
| Cocos Creator 3 | references/cocos.md — TypeScript node-tree → ECS, JSON .scene/.prefab |
inline Python recipe in the reference |
| Vanilla JavaScript / Canvas / HTML5 | references/javascript.md — class+rAF loops → ECS systems, Canvas 2D → Sprite |
— (port is a rewrite, not extraction) |
| Phaser 3 | references/phaser.md — Scene/preload/update → systems, Arcade physics, tweens | — |
| Flash / SWF | references/flash-swf.md — ffdec-based extraction, AS3 → Rust rewrite |
scripts/flash/swf_assets.py (requires ffdec on PATH) |
| Defold | references/defold.md — message-passing → Bevy Messages, Lua → Rust, 2D-first |
inline Python recipe in the reference |
| Roblox | references/roblox.md — Instance tree → ECS, asset-ID extraction, Luau → Rust | scripts/roblox/rbxlx_inventory.py (XML .rbxlx only) |
| GameMaker Studio 2 | references/gamemaker.md — Object events → systems, JSON project files | scripts/gamemaker/gms2_inventory.py (stdlib, walks .yyp) |
What ships with it
26 files 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/cocos.md 5.8 KB
- references/defold.md 6.5 KB
- references/flash-swf.md 4.9 KB
- references/gamemaker.md 6.1 KB
- references/godot.md 5.7 KB
- references/javascript.md 5.8 KB
- references/phaser.md 6.4 KB
- references/roblox.md 6.4 KB
- references/unity-animation.md 6.5 KB
- references/unity-architecture.md 5.8 KB
- references/unity-assets.md 5.5 KB
- references/unity-audio.md 5.8 KB
- references/unity-build.md 6.8 KB
- references/unity-input.md 5.7 KB
- references/unity-scenes-gltf.md 5.2 KB
- references/unity-ui.md 5.3 KB
- references/unreal.md 5.4 KB
- scripts/flash/swf_assets.py 7.0 KB runs code
- scripts/gamemaker/gms2_inventory.py 9.5 KB runs code
- scripts/godot/tscn_inventory.py 8.8 KB runs code
- scripts/roblox/rbxlx_inventory.py 7.9 KB runs code
- scripts/unity/animation_extractor.py 12 KB runs code
- scripts/unity/asset_audit.py 11 KB runs code
- scripts/unity/prefab_inspector.py 10 KB runs code
- scripts/unity/scene_inventory.py 9.1 KB runs code
- scripts/unreal/ue5_python_export.py 8.0 KB runs code
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.
- 10d ago First seen · 112 lines · 90 tokens per session scan A fd95cb7bb0a2
bevy-porting is a skill published in the GitHub repository chrisgliddon/bevy-skills (12 stars, last pushed 15d ago), licensed MIT. It adds 90 tokens to every session and 2,620 once invoked, about $0.0005 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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