What is frontend-expert CLAUDE.md?

A repository instruction file for Frontend Expert, a pack of skills and agents for building product web interfaces. It lists its UI skills, commands, design rules, checks, and supporting files.

It helps plan, build, review, test, and polish web UI, including responsive layouts, forms, data-driven screens, routing, accessibility, and visual quality.

It gives a coding agent a defined process for choosing design, responsive layout, accessibility, forms, data handling, and testing guidance. This reduces inconsistent decisions when changing a web interface.

How sukirman1901/frontend-expert configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sukirman1901/frontend-expert. 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/sukirman1901/frontend-expert/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sukirman1901/frontend-expert

Made for: Claude Code.

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/instructions/sukirman1901/frontend-expert/claude-md/github.svg)](https://agentmods.dev/instructions/sukirman1901/frontend-expert/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sukirman1901/frontend-expert/claude-md"><img src="https://agentmods.dev/badge/instructions/sukirman1901/frontend-expert/claude-md/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/instructions/sukirman1901/frontend-expert/claude-md"><img src="https://agentmods.dev/badge/instructions/sukirman1901/frontend-expert/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 634 This file is loaded in full into every session.

When invoked 634 The same file — it is already loaded in full.

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	$0.00634	$0.00634
Opus 5.5	$0.00254	$0.00254
Sonnet 5.5	$0.00127	$0.00127
Haiku 4.5	$0.00063	$0.00063

Measured 1mo ago against content hash c049ad86c563, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

frontend-expert CLAUDE.md 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 1mo 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.

CLAUDE.md · 38 lines

How it starts

The opening of the file, as written. The whole thing — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Claude Code entry point for Frontend Expert.

Plugin assets

Skills: skills/ (33 skills — suite root frontend-expert + domain pillars; see docs/pillars.md)
Agents: agents/design-reviewer.md, agents/ui-developer.md, agents/test-engineer.md
Commands: /design, /audit, /ui, /test-ui, /polish — optional
Rules: .claude/rules/design-system.md (chat-first + judgment)
Hooks: hooks/hooks.json auto-loaded by Claude Code (SessionStart + PostToolUse). Do not duplicate that path in .claude-plugin/plugin.json.
Tokens: tokens/*.css + decision tree / scoring in references/token-preset-scoring.md (+ tokens/README.md)
Evals: evals/ (E1–E33)

Default behavior (chat-first + judgment)

Do not wait for slash commands. Map intent → skills via AGENTS.md + rules
Blank-canvas / ambiguous UI → design-direction (2–3 approaches) before coding
Then → design-foundations (structural layout) → tokens → (+ typography/color/surfaces/content owners when relevant) → (+ marketing if marketing) → (+ shell/data/forms) → components → anti-slop-code → responsive → motion → anti-slop-design → polish → accessibility Blank-canvas compare/stress → prototype after design-direction, before foundations
Tests when asked → test-engineer + testing
Audit when asked → design-reviewer skill chain (/design or /audit); never fabricate visual scores; animated UI uses motion-inspection
“Rapihin / polish sampai bagus” → quality-loop (/polish), capped iterations
Honor hook advisories from anti-slop-scan.sh
If the project already has a design system, use custom mode (do not override with presets)
Icons: MUST use Reicon in shipped markup unless project icon lib or text-only waiver (references/compliance-gates.md)
Before DONE on UI builds → Conventions check including Responsive, Hierarchy, Typography, Control geometry, Motion, Shell, Landing (if marketing), A11y; use n/a or an explicit waiver only when a gate does not apply (references/compliance-gates.md)

Read the full file on GitHub · 38 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.

1mo ago Changed · +21 tokens per session c049ad86c563
1mo ago Changed · +1 lines · +38 tokens per session e5c9ed5338c6
2mo ago First seen · 37 lines · 575 tokens per session scan A 96205e87a78c

Subscribe to this mod's changes

frontend-expert CLAUDE.md is an instructions file published in the GitHub repository sukirman1901/frontend-expert (9 stars, last pushed yesterday), licensed MIT. It adds 634 tokens to every session, about $0.0025 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

frontend-expert CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
frontend-expert CLAUDE.mdsukirman1901/frontend-expert	Instructions file	9	yesterday	MIT	A	634	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

frontend-expert: Instructions file for Claude Code