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 dylantarre/animation-principles --skill implementation-debugginggit clone --depth 1 https://github.com/dylantarre/animation-principlesWrote 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/dylantarre/animation-principles/implementation-debugging)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/implementation-debugging"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/implementation-debugging.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00019 | $0.00757 |
| Opus 5 | $0.00010 | $0.00378 |
| Sonnet 5 | $0.00004 | $0.00151 |
| Haiku 4.5 | $0.00002 | $0.00076 |
Grade A, and why
implementation-debugging 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 4d 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implementation Debugging
Debug animation issues using Disney's principles as diagnostic framework.
Problem Indicators
- Animation doesn't play at all
- Animation plays but looks wrong
- Works in dev, broken in production
- Inconsistent across browsers
- Animation triggers at wrong time
- Flickering or visual glitches
Diagnosis by Principle
Timing
Issue: Animation timing is off Debug: Check duration values. Verify units (ms vs s). Check if CSS transition is being overridden. Inspect computed styles.
Straight Ahead vs Pose-to-Pose
Issue: Keyframes not hitting Debug: Verify all keyframe percentages. Check for typos in property names. Ensure values are animatable.
Staging
Issue: Animation hidden or clipped
Debug: Check z-index, overflow, opacity. Verify element is in viewport. Check for visibility: hidden.
Solid Drawing
Issue: Visual glitches during animation
Debug: Look for subpixel rendering issues. Add transform: translateZ(0) for GPU layer. Check for layout thrashing.
Follow Through
Issue: Animation ends abruptly or wrong state
Debug: Check animation-fill-mode. Verify end state matches CSS. Check for competing animations.
Common Bugs
| Symptom | Likely Cause | Fix |
|---|---|---|
| No animation | Property not animatable | Use transform instead of changing property directly |
| Flicker at start | No initial state | Set initial values explicitly |
| Wrong end state | Fill mode | Add forwards to animation |
| Choppy motion | Layout thrashing | Animate only transform/opacity |
| Works once only | Animation not reset | Remove and re-add class, or use JS |
Quick Fixes
- Check DevTools Animation panel - See timeline
- Verify animatable properties - Not all CSS animates
- Add
animation-fill-mode: forwards- Keep end state - Force GPU layer -
will-change: transform - Check for
!important- May override animation
Troubleshooting Checklist
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.
- 4d ago First seen · 98 lines · 19 tokens per session scan A 44fb6c01c46b
implementation-debugging is a skill published in the GitHub repository dylantarre/animation-principles (79 stars, last pushed 8mo ago), licensed MIT. It adds 19 tokens to every session and 757 once invoked, about $0.0001 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 2026-09-03.
Other skills, from other repositories
fixing-motion-performance
Audit and fix animation performance issues including layout thrashing, compositor properties, scroll-linked motion, and blur effects. Use when animations stutter, transitions jank, or reviewing CSS/JS animation performance.
ui-debug-workflow
Debug UI changes with a repeatable evidence-first workflow. Use when validating visual regressions, reproducing frontend bugs, comparing baseline vs changed behavior, collecting screenshots/DOM/logs, or producing stakeholder-ready UI debug reports. Keywords: ui bug, visual regression, browser devtools, playwright…
frontend-visual-verification
Confirm a CSS/HTML/template change actually rendered in a running browser — without being fooled by stale browser cache. Use whenever you edited frontend code (CSS, EJS/HTML, components) and must verify the visual result, especially when a vision screenshot seems to contradict the DOM or the served asset.
inspecting-hermes-desktop-dom
When you are developing apps/desktop and the user is running that same app (hgui / npm run dev), you can read the live rendered DOM of the window they are looking at — computed styles, geometry, which CSS rule actually won, console output — instead of inferring it from .tsx and being wrong.
inspecting-hermes-desktop-dom
Read the live Hermes desktop DOM/CSS over CDP.
baseline-ui
Quickly deslop UI code by fixing spacing, hierarchy, typography, and small layout issues. Use when the interface needs a fast cleanup or polish pass.