What is creating-canvas-video-animations?

A skill for creating animated videos with HTML5 Canvas, a browser technology for drawing graphics, and JavaScript. It produces self-contained web pages that can be previewed and exported to MP4 video.

Use it for motion graphics, promotional clips, tutorials, animated interface or code scenes, browser previews, and MP4 exports in horizontal or vertical formats.

It gives a structured way to turn a storyboard or visual idea into a timed animation and refine it by checking the result in a browser before exporting.

creating-canvas-video-animations

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 siegerts/skill-canvas-video --skill creating-canvas-video-animations

Clone the repo

git clone --depth 1 https://github.com/siegerts/skill-canvas-video

Made for: Claude Code, Codex.

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/siegerts/skill-canvas-video/creating-canvas-video-animations/github.svg)](https://agentmods.dev/skills/siegerts/skill-canvas-video/creating-canvas-video-animations)

Your own site

<a href="https://agentmods.dev/skills/siegerts/skill-canvas-video/creating-canvas-video-animations"><img src="https://agentmods.dev/badge/skills/siegerts/skill-canvas-video/creating-canvas-video-animations/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/siegerts/skill-canvas-video/creating-canvas-video-animations"><img src="https://agentmods.dev/badge/skills/siegerts/skill-canvas-video/creating-canvas-video-animations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,227 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	$0.00078	$0.01227
Opus 5.5	$0.00031	$0.00491
Sonnet 5.5	$0.00016	$0.00245
Haiku 4.5	$0.00008	$0.00123

Measured 2mo ago against content hash f43837a4b184, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

creating-canvas-video-animations 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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/export.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

creating-canvas-video-animations/SKILL.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Creating Canvas Video Animations

Build animated videos as self-contained HTML + JS files rendered on HTML5 Canvas, exportable to MP4.

When to use

User wants to create an animated video, motion graphic, or visual clip
User describes a scene, storyline, or visual sequence they want rendered
User wants to export canvas animation to MP4

Workflow

Copy this checklist and track progress:

Animation Progress:
- [ ] Step 1: Clarify requirements with user
- [ ] Step 2: Plan the timeline
- [ ] Step 3: Gather visual references
- [ ] Step 4: Build the animation class
- [ ] Step 5: Create the HTML host
- [ ] Step 6: Validate the animation
- [ ] Step 7: Iterate — preview in browser, adjust timing/layout, repeat 6→7
- [ ] Step 8: Export to MP4 (only when animation is finalized)

Step 1: Clarify with the user — ask about:

Format: horizontal (1920×1080) or vertical (1080×1920) or both. See PLATFORMS.md for platform-specific dimensions.
Duration in seconds
Visual style preferences (dark/light, color palette, retro, futuristic, minimal)
Content: what text, UI elements, code snippets, or scenes to show
Any custom fonts (loaded via FontFace API before animation starts)
Whether they need an export script

Step 2: Plan the timeline — break the animation into phases with clear start/end times. See TIMELINE.md.

Step 3: Gather visual references — ask the user to paste or drag in screenshots, mockups, or reference images. Redraw these as canvas primitives (paths, shapes, gradients) — do not embed images directly. This keeps everything vector-clean and resolution-independent. See ELEMENTS.md for the redrawing approach and reusable drawing patterns.

Step 4: Build the animation class — one JS class per animation. See ARCHITECTURE.md.

Step 5: Create the HTML host — minimal HTML that loads fonts, creates canvas, instantiates the animation. See HTML-TEMPLATE.md.

Read the full file on GitHub · 102 lines

Files

What ships with it

7 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.

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 · 102 lines · 78 tokens per session scan A f43837a4b184

Subscribe to this mod's changes

creating-canvas-video-animations is a skill published in the GitHub repository siegerts/skill-canvas-video (5 stars, last pushed 7mo ago), licensed MIT. It adds 78 tokens to every session and 1,227 once invoked, about $0.0003 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.

Creative and media agent-skills agentic-ai video-generation

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