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 sukirman1901/frontend-expert --skill app-shell-routinggit clone --depth 1 https://github.com/sukirman1901/frontend-expertWrote 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/sukirman1901/frontend-expert/app-shell-routing)<a href="https://agentmods.dev/skills/sukirman1901/frontend-expert/app-shell-routing"><img src="https://agentmods.dev/badge/skills/sukirman1901/frontend-expert/app-shell-routing/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/sukirman1901/frontend-expert/app-shell-routing"><img src="https://agentmods.dev/badge/skills/sukirman1901/frontend-expert/app-shell-routing.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 | $0.00085 | $0.00807 |
| Opus 5 | $0.00043 | $0.00404 |
| Sonnet 5 | $0.00017 | $0.00161 |
| Haiku 4.5 | $0.00009 | $0.00081 |
Grade A, and why
app-shell-routing 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.
How it starts
The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
App Shell & Routing
Overview
Define where the user is and how they move. Shell (chrome) stays stable; page content swaps. Match modern SaaS dashboard chrome — not a blank header with only text brand.
When to use
- New app layout, dashboard shell, marketing+app split
- Nav IA, breadcrumbs, nested routes, 404/unauthorized
- Settings / admin pages (still need full shell)
Workflow
- Shell chrome (MUST for product/dashboard UI)
- Logo — real mark (SVG/img), not a letter in a box alone
- Brand name visible next to logo (can truncate on tiny widths)
- Utilities — at least 1–2 of: search, notifications, help (icon buttons OK)
- Theme — if light/dark exists, put it in topbar utilities as an icon toggle (moon/sun). Do not park a labeled “Dark mode” button in the sidebar footer
- Profile — avatar-only control in the topbar at all breakpoints; name/email live in an account dropdown on click — never
display:nonethe whole account control on mobile; do not spill name/email into the header chrome by default - Anatomy:
brand · (optional primary nav) · utilities (theme/help/bell) · avatar menu
- Sidebar
- Desktop: persistent rail; support collapse → icon-only (≥768)
- Prefer auto-collapse near tablet / narrow desktop; remember preference when useful
- Mobile: overlay drawer + backdrop (not push-down accordion under the header) — see
responsive-ui - Sidebar is for nav, not theme/account chrome
- IA — primary nav ≤7 items; nest the rest; active state clear
- Routing — URLs reflect location; filters in query when shareable
- Fallbacks — 404, empty route, unauthorized → clear CTA
- Motion — load
motionfor shell/drawer/section enter (light defaults)
Checklist
- Logo mark + brand (not letter-only placeholder as the final chrome)
- Theme toggle in topbar utilities (if theming) — not sidebar footer
- Avatar-only profile → account dropdown (name/email inside menu)
- Utility cluster present (or explicit waiver: minimal tool)
- Sidebar collapse (desktop) + drawer+backdrop (mobile)
- Main landmark; active nav indication
- 404 / empty route handled when multi-route
- Icons via Reicon (or project lib) on nav items
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 · 67 lines · 85 tokens per session scan A 5491bfd63403
app-shell-routing is a skill published in the GitHub repository sukirman1901/frontend-expert (10 stars, last pushed 5d ago), licensed MIT. It adds 85 tokens to every session and 807 once invoked, about $0.0004 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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