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 calesthio/generative-media-skills --skill procedural-canvas-animationgit clone --depth 1 https://github.com/calesthio/generative-media-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/calesthio/generative-media-skills/procedural-canvas-animation)<a href="https://agentmods.dev/skills/calesthio/generative-media-skills/procedural-canvas-animation"><img src="https://agentmods.dev/badge/skills/calesthio/generative-media-skills/procedural-canvas-animation/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/calesthio/generative-media-skills/procedural-canvas-animation"><img src="https://agentmods.dev/badge/skills/calesthio/generative-media-skills/procedural-canvas-animation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00071 | $0.02588 |
| Opus 5 | $0.00036 | $0.01294 |
| Sonnet 5 | $0.00014 | $0.00518 |
| Haiku 4.5 | $0.00007 | $0.00259 |
Grade A, and why
procedural-canvas-animation 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 9d 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 — 221 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Procedural Canvas animation
Use this skill when a 2D bitmap canvas is the appropriate drawing surface for procedural motion. It covers authored particles, vector/noise fields, trails, weather, textures, generative geometry, and lightweight simulations for rendered media.
It does not cover Three.js scene graphs, WebGL/WebGPU shaders, D3 data semantics, game-engine architecture, or a generic frontend Canvas tutorial.
Evidence stance
- Documented fact: behavior from WHATWG, ECMAScript, p5.js, W3C, or cited API documentation.
- Production heuristic: a practical design or optimization choice to test in the target runtime.
- Empirical observation: a measured result from the actual animation, browser, frame output, or encoded delivery.
Facts were verified 2026-07-12. Canvas, browser, p5.js, OffscreenCanvas, and encoding behavior can change; pin versions and record the render environment.
Lock the canvas contract
Define:
- backing width/height, CSS/display size, aspect variants, fps, frame range, and alpha requirement;
- coordinate system and projection from normalized simulation space;
- seed, algorithm, initialization, parameters, and state-update order;
- stateless, replay, or checkpoint strategy;
- color space, compositing modes, background, and premultiplication assumptions;
- source images/fonts and CORS/offline policy;
- target runtime/browser, pixel density, output format, and encoder;
- reduced-motion/static variant and flash policy;
- performance budget and representative stress frames;
- provenance and rights for all source ingredients.
Understand the bitmap
Documented facts: Canvas has an intrinsic resolution separate from CSS sizing. Its default bitmap is 300 by 150. Setting its width or height clears the bitmap and resets context state. Canvas 2D begins with source-over and globalAlpha = 1 and uses premultiplied alpha. A context requested with {alpha:false} is opaque and unsuitable for transparent delivery.
Set backing dimensions explicitly. Do not stretch a low-resolution backing bitmap with CSS and call it high resolution. For fixed video output, choose exact pixel dimensions and an explicit density; p5.js pixelDensity(1) is often appropriate for predictable output.
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.
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.
- 9d ago First seen · 221 lines · 71 tokens per session scan A cd90a4823a72
procedural-canvas-animation is a skill published in the GitHub repository calesthio/generative-media-skills (171 stars, last pushed 2mo ago), licensed MIT. It adds 71 tokens to every session and 2,588 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 2026-09-03.
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