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ystack: Agent for Claude Code

.gemini/agents/frontend.md

ystack_frontend is an agent for Claude Code, Gemini CLI from Yasuui/ystack. It costs 40 tokens per session (278 once invoked), scanned A, original, MIT.

A frontend development specialist that builds React and Next.js user interfaces, including visual styling, animation, and project-specific components. React and Next.js are tools for creating web interfaces.

In plain words
What is it for?
Creating or updating production web screens, customizing interface components, adding spring-based motion, following the project’s visual rules, and summarizing the completed frontend work.
Why use it?
It provides a defined visual and implementation process for interface changes, including checks of existing components and project instructions. It also reports whether the work is ready.

Agent for Claude CodeGemini CLI

Written for Gemini CLI and Claude Code: installed under .gemini/, but also a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

This is Yasuui/ystack's own configuration. It tells Claude Code and Gemini CLI how to work on ystack itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ystack configures →

not rated 1repo 1mo ago A scan 40 tokens original MIT
View source ↗ Yasuui/ystack
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/frontend.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.

agentmods badge for ystack_frontend

README.md
[![agentmods](https://agentmods.dev/badge/agents/yasuui/ystack/frontend/github.svg)](https://agentmods.dev/agents/yasuui/ystack/frontend)
Your own site
<a href="https://agentmods.dev/agents/yasuui/ystack/frontend"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/frontend/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.

agentmods 80×15 button for ystack_frontend

Your own site · 80×15
<a href="https://agentmods.dev/agents/yasuui/ystack/frontend"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/frontend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 278 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00040 $0.00278
Opus 5.5 $0.00016 $0.00111
Sonnet 5.5 $0.00008 $0.00056
Haiku 4.5 $0.00004 $0.00028

Measured 2mo ago against content hash e91af4804251, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ystack_frontend 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/frontend.md · 21 lines

What it actually says

You are the ystack Frontend Agent. Make the UI look like it cost more than it did.

Before writing:

  1. Read .agents/skills/taste-soft-skill/SKILL.md if it exists
  2. Read swarmstack/skills/motion-skills.md
  3. Read .agents/brain/orchestrator-plan.md
  4. Scan existing components — follow patterns exactly

If you need to verify library APIs, use firecrawl to fetch method signatures, but do NOT ingest entire framework documentation. Rules: shadcn/ui always customized. Framer Motion springs only (stiffness 220-400, damping 20-28). Real glassmorphism (backdrop-filter blur + saturate). Background #080810, surface rgba(255,255,255,0.03). Never purple gradients or generic layouts.

Write complete files to final paths. Write summary to .agents/brain/frontend-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.

  1. 2mo ago First seen · 21 lines · 40 tokens per session scan A e91af4804251

Subscribe to this mod's changes

ystack_frontend is an agent published in the GitHub repository Yasuui/ystack (1 stars, last pushed 1mo ago), licensed MIT. It adds 40 tokens to every session and 278 once invoked, about $0.0002 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.

CSS and stylingDesign and UXFrontendReactai-toolsantigravitydeveloper-toolsgemini-climcpopen-source
Related

ystack_frontend compared with agents from other repositories

ystack_frontend next to 6 agents from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
ystack_frontendYasuui/ystackAgent11mo agoMITA40Claude Code, Gemini CLI
visual-fixer-applukaskellerstein/claude-my-marketplaceAgent31mo agononeA158Claude Code
frontend-ui-component-agentgirijashankarj/cursor-handbookAgent332mo agoMITA0Claude Code, Cursor
ui-developerMadAppGang/claude-codeAgent2877mo agoMITA338Claude Code
frontend-leadarmanzeroeight/fastagent-pluginsAgent293mo agoMITA40Claude Code
animation-specialistMatt-Dionis/claude-code-configsAgent6191y agoMITA33Claude Code
visual-qa-reviewerFluxonLab/SkillryAgent83d agononeA25Claude Code