fluid-design: Design & UI for AI Agents | OpenAgentSkill

Overview

Design or refine springs, gestures, and interruptible motion when physical continuity or direct manipulation matters.

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Fluid Design

Make interfaces feel like continuous physical systems, not discontinuous state flips.

Composition with other skills

This skill owns how interaction should feel.
modern-css-html owns the most native implementation that can still deliver that feel.
Prefer CSS/HTML when they can express the behaviour.
Use JavaScript/Motion/SwiftUI when you need interruption, velocity inheritance, gesture continuity, or spring physics CSS cannot express cleanly.

Defaults

Prefer springs over fixed-duration easings for interactive translation and scale.
Every user-triggerable animation must be interruptible.
Prefer direct manipulation over button-only indirection when the object can be grabbed.
Preserve velocity across gesture boundaries (release → settle/dismiss).
Keep shared identity across state/route changes when the same object survives.
Adapt interaction models to input method (mouse, trackpad, touch, keyboard).
Prefer FLIP, layout animation, or View Transitions for spatial continuity. Use direct layout-property animation only when appropriate to the component and its measured rendering cost.
Add progressive resistance at edges and rubber-banding at boundaries.
Sequence choreography: acted object leads, surroundings yield, then settle.
Provide a reduced-motion path that preserves affordances with safer alternatives.

Prefer / Reject

Prefer	Reject
`type: "spring"` for interactive motion	`transition: all`
CSS `transition` for colour/opacity	Expensive layout animation without a reason or performance check
Alternate reduced-motion layouts	`animation: none !important` as the only a11y plan
Velocity-aware hover gating on dense surfaces	Debounced hover that feels dead, or ungated strobing
Transform + opacity	Long locked keyframe sequences users must wait out

Tuning starting points

UI springs: stiffness 200–400, damping 20–30, mass 0.8–1.2
Layout reflow: ~200–350ms or a well-damped spring
Gesture dismiss: combine offset threshold + velocity threshold
Dense hover surfaces: EMA-smoothed velocity with separate engage/disengage thresholds

Input and accessibility

Desktop + motion: springs, deflection, velocity gating as designed.
Desktop + reduced motion: keep hierarchy and controls; swap spatial physics for quieter opacity/colour/snap models.
Touch: prefer drag/scroll metaphors over hover-dependent discovery.
Keyboard: every interactive surface remains operable without pointer precision.

Review checklist

Can the user reverse or redirect mid-motion?
Does travel distance/velocity change the motion response?
Are only compositor-friendly properties animating for interaction?
Does reduced motion keep the same tasks possible?
Do list/grid reflows preserve spatial memory?
Are hover-dense regions gated against fast pointer sweeps?
Is JS justified because CSS cannot express the behaviour?

References

Read Motion recipes for a matching gesture or transition implementation.
Read Principle notes when deciding how continuity should behave. Load only the reference needed for the task.

View source ↗

File metadata

name: fluid-design
description: "Design or refine springs, gestures, and interruptible motion when physical continuity or direct manipulation matters."
license: MIT

View original text

---
name: fluid-design
description: "Design or refine springs, gestures, and interruptible motion when physical continuity or direct manipulation matters."
license: MIT
---

# Fluid Design

Make interfaces feel like continuous physical systems, not discontinuous state flips.

## Composition with other skills

- This skill owns **how interaction should feel**.
- `modern-css-html` owns **the most native implementation** that can still deliver that feel.
- Prefer CSS/HTML when they can express the behaviour.
- Use JavaScript/Motion/SwiftUI when you need interruption, velocity inheritance, gesture continuity, or spring physics CSS cannot express cleanly.

## Defaults

1. Prefer springs over fixed-duration easings for interactive translation and scale.
2. Every user-triggerable animation must be interruptible.
3. Prefer direct manipulation over button-only indirection when the object can be grabbed.
4. Preserve velocity across gesture boundaries (release → settle/dismiss).
5. Keep shared identity across state/route changes when the same object survives.
6. Adapt interaction models to input method (mouse, trackpad, touch, keyboard).
7. Prefer FLIP, layout animation, or View Transitions for spatial continuity. Use direct layout-property animation only when appropriate to the component and its measured rendering cost.
8. Add progressive resistance at edges and rubber-banding at boundaries.
9. Sequence choreography: acted object leads, surroundings yield, then settle.
10. Provide a reduced-motion path that preserves affordances with safer alternatives.

## Prefer / Reject

| Prefer | Reject |
| --- | --- |
| `type: "spring"` for interactive motion | `transition: all` |
| CSS `transition` for colour/opacity | Expensive layout animation without a reason or performance check |
| Alternate reduced-motion layouts | `animation: none !important` as the only a11y plan |
| Velocity-aware hover gating on dense surfaces | Debounced hover that feels dead, or ungated strobing |
| Transform + opacity | Long locked keyframe sequences users must wait out |

## Tuning starting points

- UI springs: stiffness `200–400`, damping `20–30`, mass `0.8–1.2`
- Layout reflow: ~`200–350ms` or a well-damped spring
- Gesture dismiss: combine offset threshold + velocity threshold
- Dense hover surfaces: EMA-smoothed velocity with separate engage/disengage thresholds

## Input and accessibility

- Desktop + motion: springs, deflection, velocity gating as designed.
- Desktop + reduced motion: keep hierarchy and controls; swap spatial physics for quieter opacity/colour/snap models.
- Touch: prefer drag/scroll metaphors over hover-dependent discovery.
- Keyboard: every interactive surface remains operable without pointer precision.

## Review checklist

- [ ] Can the user reverse or redirect mid-motion?
- [ ] Does travel distance/velocity change the motion response?
- [ ] Are only compositor-friendly properties animating for interaction?
- [ ] Does reduced motion keep the same tasks possible?
- [ ] Do list/grid reflows preserve spatial memory?
- [ ] Are hover-dense regions gated against fast pointer sweeps?
- [ ] Is JS justified because CSS cannot express the behaviour?

## References

- Read [Motion recipes](references/motion-recipes.md) for a matching gesture or transition implementation.
- Read [Principle notes](references/principles.md) when deciding how continuity should behave.
Load only the reference needed for the task.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
Low GitHub adoption signal
AI review approval is missing
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
GitHub adoption: 34 GitHub stars
Stars/forks activity: 34 stars, 3 forks; issue activity unavailable in current metadata
Review status: AI review approval is missing

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Start with one small task

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3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.

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Source & usage notes

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Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: kemiljk/skills
License: MIT
Version: Unknown
Last GitHub push: Sep 10, 2026
Registry updated: Sep 12, 2026
Instruction path: skills/fluid-design/SKILL.md @ d37c59082a83

Version reported in registry metadata; check source releases before relying on it.

Quality

57/100

Promising

Trust

68/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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Creator: kemiljk
Source: kemiljk/skills
Indexed by: OpenAgentSkill community index

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