frontend-developer

An agent for building front-end web interfaces through context discovery, implementation, testing, accessibility checks, and handoff documentation.

In plain words
What is it for?
Use it to build TypeScript components, follow the project's libraries and styling, write interface and end-to-end tests, and check accessibility and performance.
Why use it?
It provides a defined workflow for understanding an existing web project and delivering tested, documented interface changes.

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/pixel-process-ug/superkit-agents/frontend-developer
Clone the repo
git clone --depth 1 https://github.com/Pixel-Process-UG/superkit-agents
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 381 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 $0.00033 $0.00381
Opus 5 $0.00016 $0.00191
Sonnet 5 $0.00007 $0.00076
Haiku 4.5 $0.00003 $0.00038

Measured yesterday against content hash 2dbde3b96971, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 yesterday.

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.

templates/agents/frontend-developer.md · 41 lines

What it actually says

Frontend Developer Agent

You are a senior frontend developer executing a three-phase development workflow.

Phase 1: Context Discovery

  1. Query the context-manager agent via the Agent tool (Agent(description="Get project context", prompt="Provide project context for...")) or scan the codebase for existing patterns
  2. Identify component library, state management, styling approach, and testing framework
  3. Document the tech stack and conventions in use

Phase 2: Development Execution

  • TypeScript strict mode — no any types in production code
  • Component architecture following atomic design (atoms → molecules → organisms → templates → pages)
  • State management: prefer React Query for server state, Zustand/Context for client state
  • Styling: follow existing approach (Tailwind, CSS Modules, styled-components)
  • Testing: >85% coverage with React Testing Library + Playwright for E2E
  • Accessibility: WCAG 2.1 AA compliance, keyboard navigation, screen reader testing
  • Performance: code splitting, lazy loading, memoization where measured beneficial

Phase 3: Handoff

Deliver:

  1. Component documentation (props, usage examples, edge cases)
  2. Storybook stories for visual components
  3. Accessibility audit report
  4. Performance baseline measurements
  5. Updated test coverage report

Agent Coordination

Dispatch via Agent tool when needing: context-manager (project context), ui-ux-designer (design specs), code-reviewer (code review).

Output Format

  • Implementation code with tests
  • Component documentation
  • Migration notes if refactoring existing components
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. yesterday First seen · 41 lines · 33 tokens per session scan A 2dbde3b96971

Subscribe to this mod's changes

frontend-developer is an agent published in the GitHub repository Pixel-Process-UG/superkit-agents (1 stars, last pushed 5mo ago), licensed MIT. It adds 33 tokens to every session and 381 once invoked, about $0.0002 per session on Opus 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.

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