frontend-ui-engineering

frontend-ui-engineering is a skill for Claude Code, Codex from Plazmodium/odin-workflow. It costs 23 tokens per session (307 once invoked), scanned A, original, MIT.

A method for building browser interfaces that work across screen sizes and user states, while supporting keyboard use, accessibility, and the project's existing visual patterns.

In plain words
What is it for?
Use it when creating or changing pages, components, forms, navigation, styling, or other visible browser behavior.
Why use it?
It catches problems that a successful build or a single screenshot cannot show, such as broken interactions, mobile layouts, loading states, or errors.

Skill for Claude CodeCodex

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 skills/plazmodium/odin-workflow/frontend-ui-engineering
Any agent
npx skills add Plazmodium/odin-workflow --skill frontend-ui-engineering
Clone the repo
git clone --depth 1 https://github.com/Plazmodium/odin-workflow

Made for: Claude Code, Codex.

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-ui-engineering

README.md
[![agentmods](https://agentmods.dev/badge/skills/plazmodium/odin-workflow/frontend-ui-engineering.svg)](https://agentmods.dev/skills/plazmodium/odin-workflow/frontend-ui-engineering)
Your own site
<a href="https://agentmods.dev/skills/plazmodium/odin-workflow/frontend-ui-engineering"><img src="https://agentmods.dev/badge/skills/plazmodium/odin-workflow/frontend-ui-engineering.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 307 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 $0.00023 $0.00307
Opus 5 $0.00012 $0.00153
Sonnet 5 $0.00005 $0.00061
Haiku 4.5 $0.00002 $0.00031

Measured 3d ago against content hash 09b8c40aa7f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

frontend-ui-engineering 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 3d 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.

agents/skills/workflow/frontend-ui-engineering/SKILL.md · 43 lines

What it actually says

frontend-ui-engineering

When To Use

  • Creating or changing visible UI.
  • Modifying component structure, state, forms, navigation, or styling.
  • Fixing user-facing browser behavior.

Workflow

  1. Inspect existing design system, component patterns, routes, and state conventions.
  2. Define desktop, mobile, loading, empty, error, and disabled states.
  3. Preserve established visual language unless asked to redesign.
  4. Implement semantic markup and keyboard-accessible interactions.
  5. Validate responsive behavior at relevant breakpoints.
  6. Check console, network, and visible behavior when feasible.
  7. Add or update tests for meaningful behavior.

Anti-Rationalization

Excuse Rebuttal
"It compiles, so the UI is done." UI must work in the browser and across states.
"Accessibility can come later." Accessibility is part of correctness for UI.
"The screenshot looks fine." Static appearance does not prove interactions, errors, or mobile layout.

Verification

  • UI handles core states and relevant viewport sizes.
  • Interactions work with keyboard and pointer where applicable.
  • Runtime evidence or tests support the result.

Exit Criteria

  • The UI is usable, accessible, responsive, and consistent with local conventions.
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. 3d ago First seen · 43 lines · 23 tokens per session scan A 09b8c40aa7f0

Subscribe to this mod's changes

frontend-ui-engineering is a skill published in the GitHub repository Plazmodium/odin-workflow (0 stars, last pushed 3mo ago), licensed MIT. It adds 23 tokens to every session and 307 once invoked, about $0.0001 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 2026-09-01.

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