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.
npx skills add magnus919/hermes-profiles --skill frontend-engineeringgit clone --depth 1 https://github.com/magnus919/hermes-profilesWrote 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.
[](https://agentmods.dev/skills/magnus919/hermes-profiles/frontend-engineering)<a href="https://agentmods.dev/skills/magnus919/hermes-profiles/frontend-engineering"><img src="https://agentmods.dev/badge/skills/magnus919/hermes-profiles/frontend-engineering/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.
<a href="https://agentmods.dev/skills/magnus919/hermes-profiles/frontend-engineering"><img src="https://agentmods.dev/badge/skills/magnus919/hermes-profiles/frontend-engineering.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00039 | $0.00842 |
| Opus 5 | $0.00019 | $0.00421 |
| Sonnet 5 | $0.00008 | $0.00168 |
| Haiku 4.5 | $0.00004 | $0.00084 |
Grade A, and why
frontend-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 9d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- frontend-engineering — 89% identical, 41 lines differ
How it starts
The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Engineering Methodology
Frontend engineering is the craft of building the user-facing layer of applications — components, state management, API integration, responsive layout, and client-side performance. This methodology bridges UX design (user journeys, wireframes, accessibility standards) and the reviewer (code quality gate).
The Frontend Engineer's Domain
| You own | You don't own |
|---|---|
| Component implementation — UI component composition, props/state interfaces, rendering patterns, lifecycle | User journeys, wireframes, accessibility standards, interaction design — that's the ux-designer |
| State management — client-side state architecture, data fetching patterns, caching, optimistic updates | API contract design — that's the technical-architect |
| API integration — frontend-to-backend data flow, auth flows (OAuth, JWT), real-time updates | Test strategy and automation — that's the QA-engineer |
| Responsive design implementation — layout systems, breakpoints, cross-device testing | Visual identity and brand guidelines — that's the brand-designer |
| Client-side performance — bundle optimization, lazy loading, Core Web Vitals, render optimization | Editorial content and copy — that's the writer |
| Frontend testing — component tests, integration tests, visual regression, accessibility tests | Code review and quality gates — that's the reviewer |
| Build tooling — bundler config, TypeScript config, linting, formatting, dev environment | CI/CD pipeline infrastructure — that's the platform-engineer |
Reference Files
| Reference | When to load |
|---|---|
references/component-architecture.md |
Designing component trees — composition patterns, props/state interfaces, lifecycle, accessibility fundamentals |
references/state-management.md |
Choosing and implementing state management — client vs server state, data fetching, caching, optimistic updates |
references/api-integration.md |
Connecting frontend to backend — API client design, auth token flow, error handling in the UI, real-time subscriptions |
references/responsive-layout-testing.md |
Implementing responsive designs (layout system selection — Grid vs Flexbox vs Container Queries, breakpoint strategies, cross-device testing methodology) and testing frontend code (component testing with Testing Library, integration testing with Playwright/Cypress, visual regression, accessibility testing with axe-core and Lighthouse CI, test data management) |
references/performance.md |
Optimizing client-side performance — Core Web Vitals, bundle analysis, code splitting, render optimization |
What ships with it
5 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.
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.
- 9d ago First seen · 50 lines · 39 tokens per session scan A 4e2280641037
frontend-engineering is a skill published in the GitHub repository magnus919/hermes-profiles (152 stars, last pushed 2mo ago), licensed MIT. It adds 39 tokens to every session and 842 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 2026-08-30.
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