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 follow-through-overlappinggit 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/follow-through-overlapping)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/follow-through-overlapping"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/follow-through-overlapping/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/dylantarre/animation-principles/follow-through-overlapping"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/follow-through-overlapping.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00034 | $0.00870 |
| Opus 5 | $0.00017 | $0.00435 |
| Sonnet 5 | $0.00007 | $0.00174 |
| Haiku 4.5 | $0.00003 | $0.00087 |
Grade A, and why
follow-through-overlapping 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 9d 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 — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Follow Through & Overlapping Action Mastery
The Momentum Principle
Nothing stops all at once. When a character halts, their hair keeps moving. When a car brakes, passengers lurch forward. Follow through and overlapping action capture how different parts of a system respond to forces at different rates—the principle that makes animation feel physically grounded.
Core Theory: Two Related Concepts
Follow Through: When the main body stops, appendages continue moving due to momentum, then settle. The termination behavior of motion.
Overlapping Action: Different parts move at different rates throughout motion, not just at stops. Hair doesn't start moving when the head starts—it drags behind, then catches up. The continuous offset of timing.
The Drag Hierarchy
Parts further from the root of motion drag more:
- Root (hips, torso): Moves first, stops first
- Primary extensions (limbs, head): Slight delay
- Secondary extensions (hands, facial features): More delay
- Tertiary elements (fingers, hair, cloth): Maximum drag
Each level follows the previous, creating cascading waves of motion.
Physical Properties Affecting Drag
- Mass: Heavier elements have more follow through
- Flexibility: Softer materials show more overlapping action
- Air resistance: Flat/wide surfaces drag more
- Attachment point: Loose connections create greater offset
Interaction with Other Principles
Timing defines follow through duration: Fast stops = long follow through; slow stops = subtle settling.
Arcs govern the follow through path: Appendages swing through curved trajectories, not linear ones.
Secondary action is often follow through: The supporting motion that enriches without distracting.
Squash/stretch appears in settling: Objects compress slightly when follow through terminates.
Domain Applications
UI/Motion Design
- List scrolling: inertial continuation past finger release
- Card stacks: sequential settling with offset timing
- Modal dismissal: background elements settle after foreground
- Pull-to-refresh: elastic overshoot and return
- Notification badges: bounce and settle on count change
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.
- 9d ago First seen · 93 lines · 34 tokens per session scan A ea575504797c
follow-through-overlapping is a skill published in the GitHub repository dylantarre/animation-principles (81 stars, last pushed 8mo ago), licensed MIT. It adds 34 tokens to every session and 870 once invoked, about $0.0002 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
frontend-design
Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.
visual-plan
Turn ordinary text plans into rich interactive visual plans with diagrams, file maps, annotated code, open questions, and UI/prototype review when useful.
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.
antv-x6-editor
A skill for creating and troubleshooting interactive diagrams with AntV X6, a JavaScript engine for editors made of connected nodes and lines. It supports diagram types such as flowcharts, dependency graphs, entity-relationship diagrams, and organization charts.
infographic-creator
Create beautiful infographics based on given text content. Use when users request to create infographics.
extract
Crawl an existing website (capped, multi-page) and seed stardust/current/ with PRODUCT.md, DESIGN.md, DESIGN.json, a per-page inventory, and the consolidated brand surface — the captured design system, palette, typography, motifs, and voice of the live site. Use when the user wants to analyze an existing site's…