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 60fps-Design/plugin --skill motion-systemgit clone --depth 1 https://github.com/60fps-Design/pluginWrote 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/60fps-design/plugin/motion-system)<a href="https://agentmods.dev/skills/60fps-design/plugin/motion-system"><img src="https://agentmods.dev/badge/skills/60fps-design/plugin/motion-system/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/60fps-design/plugin/motion-system"><img src="https://agentmods.dev/badge/skills/60fps-design/plugin/motion-system.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 | $0.00088 | $0.02315 |
| Opus 5.5 | $0.00035 | $0.00926 |
| Sonnet 5.5 | $0.00018 | $0.00463 |
| Haiku 4.5 | $0.00009 | $0.00231 |
Grade A, and why
motion-system 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 3d 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 — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Motion system
An app feels like one app when the same kind of moment always moves the same way. Most codebases
drift: a dozen durations, springs nobody could tell apart, a success haptic used for everything. Your
job is to replace that drift with a few named values, grounded in the app's own best motion and in
real apps from the 60fps library.
The deliverable is a proposal, then one new file. Do not edit existing call sites until the user agrees to the proposal.
1. Find the floor
Read the app target's IPHONEOS_DEPLOYMENT_TARGET. When the target sets its own value it overrides
the project-wide one, in either direction. Look wherever the project defines it: the .xcodeproj,
an XcodeGen project.yml, .xcconfig files, or Package.swift. Every API you propose must exist at
that version. Note the Swift language mode and any default actor isolation setting too; you need them to
compile in step 5.
2. Inventory what the app does now
Search the code for every motion value and everything timed against one:
- Animations:
withAnimation(,.animation(,.spring(,.interactiveSpring,.interpolatingSpring,.smooth,.snappy,.bouncy,.easeIn,.easeOut,.easeInOut,.linear,.default,duration:,.delay(,response:,dampingFraction:. A bare.smooth,.snappyor.bouncyis a value too (0.5 s by default), so count it. - Transitions and effects:
.transition(,contentTransition,matchedGeometryEffect,matchedTransitionSource,phaseAnimator,keyframeAnimator,symbolEffect. - Timing coupled to animation:
Task.sleep,asyncAfter, completion handlers. These are the riskiest to change: a sleep tuned to a 0.35 s animation breaks when the animation changes. - Haptics:
sensoryFeedback, theUI...FeedbackGeneratorclasses, and the call sites of any wrapper the app has around them (aHapticManagerwith 50 call sites matters more than the class). - Reduce Motion: every way it is read (
accessibilityReduceMotion,isReduceMotionEnabled). - Existing helpers: any
Motion,Animationor haptics extension or manager.
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.
- 3d ago First seen · 152 lines · 88 tokens per session scan A a105af9f7b12
motion-system is a skill published in the GitHub repository 60fps-Design/plugin (1 stars, last pushed 3d ago), licensed MIT. It adds 88 tokens to every session and 2,315 once invoked, about $0.0004 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 2026-10-13.
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