What is ystack_motion?

A motion-design review agent for frontend work. It checks components for specified animation behavior, including spring motion, entry and exit transitions, interaction scaling, and status colors.

Use it after a frontend agent to audit motion behavior and write either motion-only patches or a not-ready status to the project's motion output file.

It catches missing or inconsistent interface animation after frontend work has been produced. It also makes the review sequence and output format explicit.

How Yasuui/ystack configures Claude Code and Gemini CLI

Reuse

Borrowing it

Nothing to install: this file belongs to Yasuui/ystack. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Yasuui/ystack/main/.gemini/agents/motion.md

Clone the repo

git clone --depth 1 https://github.com/Yasuui/ystack

Made for: Claude Code, Gemini CLI.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/yasuui/ystack/motion/github.svg)](https://agentmods.dev/agents/yasuui/ystack/motion)

Your own site

<a href="https://agentmods.dev/agents/yasuui/ystack/motion"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/motion/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/yasuui/ystack/motion"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/motion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 177 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00030	$0.00177
Opus 5.5	$0.00012	$0.00071
Sonnet 5.5	$0.00006	$0.00035
Haiku 4.5	$0.00003	$0.00018

Measured 2mo ago against content hash e9ed3f7e532b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ystack_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 2mo 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.

.gemini/agents/motion.md · 15 lines

What it actually says

You are the ystack Motion Agent. Read .agents/brain/frontend-output.md first. Then audit every component.

Rules: Springs only — never linear. Enter AND exit (AnimatePresence). Scale 0.96-1.04 on interactions. Status glow: pending=#facc15, error=#ef4444, success=#22c55e.

Output: Issues Found → Patches (diff-style, motion code only) → Why Better.

Write to .agents/brain/motion-output.md. End with: STATUS: READY or STATUS: NOT READY — [reason]

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.

2mo ago First seen · 15 lines · 30 tokens per session scan A e9ed3f7e532b

Subscribe to this mod's changes

ystack_motion is an agent published in the GitHub repository Yasuui/ystack (1 stars, last pushed 1mo ago), licensed MIT. It adds 30 tokens to every session and 177 once invoked, about $0.0001 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 2026-08-31.

Design and UX Frontend ai-tools antigravity developer-tools gemini-cli mcp open-source

ystack_motion next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ystack_motionYasuui/ystack	Agent	1	1mo ago	MIT	A	30	Claude Code, Gemini CLI
a11y-architectJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	45	Claude Code
ux-lens-revieweraryaniyaps/lamina	Agent	120	19d ago	Apache-2.0	A	61	Claude Code
designerulises-jeremias/agent-toolkit	Agent	19	today	MIT	A	94	Claude Code
design-reviewerwasintoh/toh-framework	Agent	96	2mo ago	MIT	A	85	Claude Code
conversation-analyzerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	30	Claude Code
signal-scorerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	40	Claude Code

ystack: Agent for Claude Code