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 scott-fryxell/brayness --skill motion-systemsgit clone --depth 1 https://github.com/scott-fryxell/braynessWrote 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/scott-fryxell/brayness/motion-systems)<a href="https://agentmods.dev/skills/scott-fryxell/brayness/motion-systems"><img src="https://agentmods.dev/badge/skills/scott-fryxell/brayness/motion-systems/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/scott-fryxell/brayness/motion-systems"><img src="https://agentmods.dev/badge/skills/scott-fryxell/brayness/motion-systems.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 | $0.00060 | $0.01585 |
| Opus 5 | $0.00030 | $0.00792 |
| Sonnet 5 | $0.00012 | $0.00317 |
| Haiku 4.5 | $0.00006 | $0.00159 |
Grade A, and why
motion-systems 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 yesterday.
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 — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS Motion Systems
Production-oriented motion for web UI - interaction clarity, performance, and accessibility, not decoration. Skip motion entirely when it adds cognitive load or delays a state update that must feel instant.
Motion Goals
Each proposal should satisfy at least one of these goals:
- Continuity - where things came from and where they go
- Feedback - action acknowledged with clear response
- Hierarchy - what changed most and why
- Focus Guidance - attention moves to the right target
Mechanism Selection
Choose the lightest mechanism that satisfies the interaction:
- CSS transition - state changes on a single element/component (hover, open/close, selected state)
- CSS keyframes - multi-stage timeline or repeated motion (loading, attention pulse, choreography)
- WAAPI - imperative sequencing, playback control, cancel/reverse sync with logic
- View Transitions API - continuity across DOM swaps, route changes, or layout mode changes
Transform Strategy
translate: / rotate: / scale: (individual properties)
Use individual transform properties when:
- You want composable state layers (base styles + state overrides)
- Different interactions control different transform channels
- You need clearer design-token mapping and maintainability
transform: shorthand
Use shorthand when:
- Transform order is intentionally coupled
- You combine multiple functions in one declaration and must preserve exact sequence
- You need functions not exposed as individual props in your target browser strategy
translate3d() and 3D transforms
Use translate3d() only when:
- You need actual 3D/perspective behavior
- You have profiled a measurable compositor benefit in a real bottleneck
Avoid using translate3d() as a blanket "GPU hack". It can increase layer memory and produce jank if overused.
Easing System (Including linear())
Default guidance
- Use
cubic-bezier()for most product interactions - Use
linear()for piecewise velocity control and custom motion signatures - Tokenize easing values and reuse consistently
What ships with it
4 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.
- yesterday Changed a800d225e323
- 10d ago First seen · 184 lines · 60 tokens per session scan A 06cd5cf5682b
motion-systems is a skill published in the GitHub repository scott-fryxell/brayness (120 stars, last pushed 2d ago), licensed MIT. It adds 60 tokens to every session and 1,585 once invoked, about $0.0003 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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