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 iart-ai/web-animation-skills --skill ascii-animationgit clone --depth 1 https://github.com/iart-ai/web-animation-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/iart-ai/web-animation-skills/ascii-animation)<a href="https://agentmods.dev/skills/iart-ai/web-animation-skills/ascii-animation"><img src="https://agentmods.dev/badge/skills/iart-ai/web-animation-skills/ascii-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/iart-ai/web-animation-skills/ascii-animation"><img src="https://agentmods.dev/badge/skills/iart-ai/web-animation-skills/ascii-animation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk 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 | $0.00098 | $0.02592 |
| Opus 5 | $0.00049 | $0.01296 |
| Sonnet 5 | $0.00020 | $0.00518 |
| Haiku 4.5 | $0.00010 | $0.00259 |
Grade A, and why
ascii-animation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- ascii-animation — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ASCII Animation
Render motion entirely with text characters. ASCII output is extremely lightweight, distinctive, and works in browsers (<pre>/canvas), terminals (ANSI), and over any 3D scene (Three.js AsciiEffect).
When to use
- Build terminal/CLI intros, loaders, banners, or a retro/hacker aesthetic.
- Convert an image, video frame, or 3D scene into animated ASCII.
- Add an ASCII post-effect over an existing canvas/WebGL render.
- Create generative text fields (plasma, sine waves, noise, tunnels).
Core concept: the brightness ramp
Map luminance (0..1) to a character whose ink density matches. Order characters dark-to-light. Pick the index with Math.round(lum * (ramp.length - 1)).
Common ramps (dark to light):
- Short (10):
.:-=+*#%@ - Medium (16):
.'\^",:;Il!i><~+_-?][}{1)(|/tfjrxnuvczXYUJCLQ0OZmwqpdbkhao*#MW&8%B@$` truncated — see table below. - Standard 70-level (Paul Bourke), best for photos:
$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,"^`'.(reverse for dark-on-light).
Compute relative luminance from sRGB (perceptual):
const lum = (0.2126 * r + 0.7152 * g + 0.0722 * b) / 255; // 0..1
Invert when drawing dark text on a light background: lum = 1 - lum.
Character cell aspect correction (the #1 gotcha)
Monospace character cells are taller than wide — roughly 0.5 width:height. Sampling a square pixel grid produces a vertically stretched image. Correct by sampling fewer rows than columns: for a target of cols characters wide, use rows = Math.round(cols * (imgH / imgW) * fontAspect) where fontAspect ≈ 0.5. Equivalently, when drawing to an offscreen canvas, set its height to cols * aspect * 0.5.
Web rendering: <pre> vs canvas
<pre>+ textContent: simplest. One string with\nper row. Fine up to ~120×60 chars at 30fps. Setwhite-space: pre; font-family: monospace; line-height: 1;.- Canvas
fillText: needed for per-character color, larger grids, or 60fps. Draw each char atx * cellW, y * cellH. Faster than thousands of DOM nodes.
What ships with it
3 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.
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 · 180 lines · 98 tokens per session scan A a2f45a09e0e6
ascii-animation is a skill published in the GitHub repository iart-ai/web-animation-skills (21 stars, last pushed 2mo ago), licensed MIT. It adds 98 tokens to every session and 2,592 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 2026-08-30.
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