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 MasterPlayspots/motionspec --skill motiongit clone --depth 1 https://github.com/MasterPlayspots/motionspecWrote 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/masterplayspots/motionspec/motion)<a href="https://agentmods.dev/skills/masterplayspots/motionspec/motion"><img src="https://agentmods.dev/badge/skills/masterplayspots/motionspec/motion/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/masterplayspots/motionspec/motion"><img src="https://agentmods.dev/badge/skills/masterplayspots/motionspec/motion.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 | $0.00057 | $0.00468 |
| Opus 5.5 | $0.00023 | $0.00187 |
| Sonnet 5.5 | $0.00011 | $0.00094 |
| Haiku 4.5 | $0.00006 | $0.00047 |
Grade A, and why
motion 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 1mo 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.
What it actually says
MotionSpec authoring workflow
When the user wants animation on a web page, do not hand-write GSAP or CSS keyframes for effects the MotionSpec catalog covers. Follow this loop:
- Catalog first. Call the
motion_catalogMCP tool to get the current primitive list (40 primitives: scroll reveals, parallax, hovers, loops, marquees, kenBurns, …) and the authoring rules. Only primitives in the catalog exist — never invent one. - Write the spec. A MotionSpec is JSON:
{ "specVersion": "1.0", "meta": { "target": "vanilla-gsap" }, "motions": [ { "id": "...", "primitive": "<from catalog>", "target": "<CSS selector>", "params": { ... } } ] }. OptionalglobalscontrolrespectReducedMotion,defaultEase, and pause controls for persistent motion. - Validate — never skip. Call
motion_validatewith the spec. Fix everyMS-*error it returns and re-validate untilok: true. The validator is the trust boundary; do not work around it. - Compile. Call
motion_compileand emit the returned code verbatim. Same spec, same bytes — do not hand-edit the compiled output; change the spec and recompile instead.
Notes for honest use:
- Reduced-motion fallbacks and performance budgets are enforced by construction in the compiled output — that is the point of the tool.
- Scope is motion accessibility (WCAG 2.2.2 Pause, Stop, Hide and 2.3.3 Animation from Interactions). Never present the result as a general accessibility guarantee for the whole page.
- This is not the Motion.dev animation library, not usemotion.com, and not an AI video generator.
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.
- 1mo ago First seen · 34 lines · 57 tokens per session scan A 2c2b3049ca9a
motion is a skill published in the GitHub repository MasterPlayspots/motionspec (1 stars, last pushed yesterday), licensed MIT. It adds 57 tokens to every session and 468 once invoked, about $0.0002 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.
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