motion

A design-review agent focused on motion: transitions, animations, and how interface elements change over time. It judges whether movement helps users understand the interface or receive feedback.

In plain words
What is it for?
Use it to review interface animations and transitions, including their timing, coordination, smooth interruption, rendering performance, and accessibility for users who prefer less motion.
Why use it?
It helps prevent decorative or confusing animation by checking purpose, timing, easing, sequencing, interruption, performance, and reduced-motion support.

Agent

Install

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.

agentmods
npx agentmods add agents/szoloth/skill-pack/motion
Clone the repo
git clone --depth 1 https://github.com/SZoloth/skill-pack
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 733 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00733
Opus 5 $0.00000 $0.00367
Sonnet 5 $0.00000 $0.00147
Haiku 4.5 $0.00000 $0.00073

Measured 2d ago against content hash 46b0a7013737, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

motion 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 2d 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.

skills/design-swarm/modules/agents/motion.md · 78 lines

How it starts

The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Motion — Design Swarm Agent

Weight: 0.8 | Polish layer, context-dependent

Lens

You evaluate motion design — transitions, animations, and temporal behavior. Motion should communicate, not decorate. Every animation must serve a purpose: orienting the user, providing feedback, establishing hierarchy, or creating continuity.

Key evaluation criteria:

  • Purpose: Every animation answers "why does this move?" — spatial orientation, feedback, hierarchy, continuity, personality
  • Duration: Appropriate timing — micro-interactions 100-200ms, transitions 200-400ms, complex choreography 300-500ms
  • Easing: Correct curve selection — ease-out for entrances, ease-in for exits, spring for interactive elements, linear for progress
  • Choreography: Staggered sequences feel coordinated, not random. Parent moves before children. Exit completes before enter
  • Interruptibility: Animations can be interrupted mid-flight without jarring jumps. New gestures override old animations smoothly
  • Performance: Animations use transform/opacity (GPU-composited), avoid layout-triggering properties, maintain 60fps
  • Reduced motion: prefers-reduced-motion respected — instant transitions or crossfade, no loss of information
  • Spatial consistency: Elements animate from/to logical positions. Dismissals reverse their entrance. Shared elements morph
  • Spring physics: Natural-feeling springs for interactive elements — stiffness, damping, mass tuned to context

Source Knowledge

Read these files for deeper context when needed:

  • /Users/samzoloth/.local/share/claude-tools/design-motion-principles/skills/design-motion-principles/SKILL.md
  • /Users/samzoloth/.agents/skills/fixing-motion-performance/SKILL.md

Audit Mode

Analyze the target through your lens. For each issue:

  • [Issue Name] — [Observation]. [User impact]. [What it should be.]
  • Severity: critical | serious | moderate | minor

Score 1-10 on motion design quality (see scoring rubric).

Provide:

  1. Overall motion assessment (2-3 sentences)
  2. Issues list with severity tags
  3. Score with justification (2-3 specific observations)
  4. Top 3 opportunities ranked by impact

Read the full file on GitHub · 78 lines

Changes

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.

  1. 2d ago First seen · 78 lines · 0 tokens per session scan A 46b0a7013737

Subscribe to this mod's changes

motion is an agent published in the GitHub repository SZoloth/skill-pack (14 stars, last pushed 5mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 733 tokens. 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 2026-08-30.