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 existential-birds/beagle --skill ios-animation-designgit clone --depth 1 https://github.com/existential-birds/beagleWrote 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/existential-birds/beagle/ios-animation-design)<a href="https://agentmods.dev/skills/existential-birds/beagle/ios-animation-design"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/ios-animation-design/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/existential-birds/beagle/ios-animation-design"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/ios-animation-design.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 | $0.00086 | $0.02642 |
| Opus 5.5 | $0.00034 | $0.01057 |
| Sonnet 5.5 | $0.00017 | $0.00528 |
| Haiku 4.5 | $0.00009 | $0.00264 |
Grade A, and why
ios-animation-design 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.
How it starts
The opening of the file, as written. The whole thing — 186 lines — stays where its author put it; the contents beside it link to each section on GitHub.
iOS Animation Design
Plan animations that feel intentional, not decorative. Apple's HIG is clear: "Don't add motion for the sake of adding motion. Gratuitous or excessive animation can distract people and may make them feel disconnected or physically uncomfortable." Every animation must serve a purpose — guide attention, communicate state changes, reinforce spatial relationships, or provide feedback.
Before adding any custom animation, ask: does the system already handle this? Many system components include motion automatically — Liquid Glass (iOS 26) responds to touch with greater emphasis and produces more subdued effects for trackpad interaction. Standard controls, navigation transitions, and sheets already animate. Custom motion should fill gaps the system doesn't cover, not replace what it already does well.
Design Process
Gates (sequenced)
Advance only after each pass condition is met in the working artifact (chat or doc). Do not rationalize compliance without evidence.
- Gate — Context captured — Pass when there are written answers for: what triggers the motion, its purpose, where it lives in the app, how often it runs, minimum iOS version, and primary input methods (or explicit N/A where not applicable). Pass when you have stated whether system-provided motion already covers this or which gap custom animation fills.
- Gate — Options differ meaningfully — Pass when there are 2–3 approaches and each differs in at least two of: named API/technique, motion character, complexity band, or iOS floor — not minor timing tweaks of the same idea.
- Gate — Spec is implementation-ready — Pass when the compiled spec includes concrete entries for Trigger, Interruption (cancel/reverse/queue), Reduce Motion fallback, Haptics (or explicit none with rationale), and Recommended API.
Step 1: Understand the Animation Context
Before proposing options, gather context about what needs to animate and why:
What ships with it
2 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.
- 1mo ago First seen · 186 lines · 86 tokens per session scan A 10af70cca9bf
ios-animation-design is a skill published in the GitHub repository existential-birds/beagle (82 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 86 tokens to every session and 2,642 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 2026-09-16.
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