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frontend-developer

frontend-developer is a skill for Claude Code from olehsvyrydov/AI-development-team. It costs 97 tokens per session (4,151 once invoked), scanned A, original, MIT.

A frontend development guide for the part of an application that users see and interact with. It covers web interfaces, mobile interfaces, UI components, application state, styling, and data connections.

In plain words
What is it for?
Use it to create React or Next.js interfaces, Angular or Vue applications, React Native or Flutter mobile apps, reusable components, state management, API connections, styling, and frontend tests.
Why use it?
It gives a consistent way to build and test screens without mixing user-interface work with server-side business logic. It also helps select practices for the project's web or mobile framework.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ai-dev-team plugin — 43 skills, 50 commands shipped together

not rated 17repo +1 today A scan 97 tokens original MIT

Good fit Use it to create React or Next.js interfaces, Angular or Vue applications, React Native or Flutter mobile apps, reusable components, state management, API connections, styling, and frontend tests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/olehsvyrydov/ai-development-team/frontend-developer
View source ↗ olehsvyrydov/AI-development-team
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.

Any agent
npx skills add olehsvyrydov/AI-development-team --skill frontend-developer
Clone the repo
git clone --depth 1 https://github.com/olehsvyrydov/AI-development-team

Made for: Claude Code.

Or install ai-dev-team, the plugin that ships this one along with the rest of its 43 skills, 50 commands.

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 frontend-developer

README.md
[![agentmods](https://agentmods.dev/badge/skills/olehsvyrydov/ai-development-team/frontend-developer/github.svg)](https://agentmods.dev/skills/olehsvyrydov/ai-development-team/frontend-developer)
Your own site
<a href="https://agentmods.dev/skills/olehsvyrydov/ai-development-team/frontend-developer"><img src="https://agentmods.dev/badge/skills/olehsvyrydov/ai-development-team/frontend-developer/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 frontend-developer

Your own site · 80×15
<a href="https://agentmods.dev/skills/olehsvyrydov/ai-development-team/frontend-developer"><img src="https://agentmods.dev/badge/skills/olehsvyrydov/ai-development-team/frontend-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,151 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 $0.00097 $0.04151
Opus 5.5 $0.00039 $0.01660
Sonnet 5.5 $0.00019 $0.00830
Haiku 4.5 $0.00010 $0.00415

Measured today against content hash 0d1dd406299d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

frontend-developer 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 today.

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/skills/development/frontend/react/frontend-developer/SKILL.md · 360 lines

How it starts

The opening of the file, as written. The whole thing — 360 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Frontend Developer (/fe)

Primary command: /fe Aliases: /finn, "Finn"

Gate Check (workflow)

Consult the workflow-engine skill first — it determines which gates this ticket requires.

  • Before implementing: the hard gates that apply must be passed — ARCH_APPROVED / SECOPS_APPROVED when their triggers fire, and APPROVAL_GATE on the full track (or when a preset forces it). DESIGN_APPROVED is soft for visual work — proceed if it's skipped with a recorded reason. If a required hard gate is unmet, STOP and hand to its owner.
  • On completion (TDD): tests written and green, then hand to /rev for CODE_REVIEWED. Record progress in the ticket.

Trigger

Use this skill when:

  • User invokes /fe or /finn command
  • User asks for "Finn" by name for frontend matters
  • Implementing frontend features with React/Next.js
  • Building mobile apps with React Native/Expo
  • Writing TypeScript code
  • Creating UI components and design systems
  • Implementing state management
  • Working with APIs and data fetching (REST, GraphQL, WebSockets, tRPC)
  • Styling with TailwindCSS/NativeWind or modern CSS
  • Writing frontend unit and integration tests
  • Performance optimization (Core Web Vitals)
  • Accessibility implementation (WCAG 2.2)
  • SEO and metadata optimization
  • Animation and transitions (Framer Motion, CSS, View Transitions)
  • Authentication flows (OAuth2/PKCE, NextAuth.js)
  • Internationalization (i18n)
  • Building Eclipse Theia extensions / Theia-based IDE products → references/theia.md

Context

You are Finn, a Senior Frontend Developer with 10+ years of experience in web and mobile development. You have built production applications serving millions of users with React, Next.js, and React Native. You are proficient in TypeScript, modern CSS, state management patterns, and accessible UI development. You follow TDD strictly, prioritize accessibility, and create performant, maintainable user interfaces.

Research-First Development (MANDATORY)

Read the full file on GitHub · 360 lines

Files

What ships with it

9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. today First seen · 360 lines · 97 tokens per session scan A 0d1dd406299d

Subscribe to this mod's changes

frontend-developer is a skill published in the GitHub repository olehsvyrydov/AI-development-team (17 stars, last pushed today), licensed MIT. It adds 97 tokens to every session and 4,151 once invoked, about $0.0004 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 2026-10-19.

FrontendMobileReactagentic-workflowai-agentsai-dev-toolsanthropic
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