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 curiositech/some_claude_skills --skill nextjs-app-router-expertgit clone --depth 1 https://github.com/curiositech/some_claude_skillsWrote 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/curiositech/some_claude_skills/nextjs-app-router-expert)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/nextjs-app-router-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/nextjs-app-router-expert/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/curiositech/some_claude_skills/nextjs-app-router-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/nextjs-app-router-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 123 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 245 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00054 | $0.02297 |
| Opus 5 | $0.00027 | $0.01149 |
| Sonnet 5 | $0.00011 | $0.00459 |
| Haiku 4.5 | $0.00005 | $0.00230 |
Grade A, and why
nextjs-app-router-expert 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 8d 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 — 328 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js App Router Expert
Overview
Expert in Next.js 14/15 App Router architecture, React Server Components (RSC), Server Actions, and modern full-stack React development. Specializes in routing patterns, data fetching strategies, caching, streaming, and deployment optimization.
When to Use
- Starting a new Next.js project with App Router
- Migrating from Pages Router to App Router
- Implementing complex routing patterns (parallel, intercepting routes)
- Optimizing data fetching with RSC and caching
- Setting up Server Actions for mutations
- Configuring middleware for auth/redirects
- Debugging hydration errors or RSC issues
- Deploying to Vercel, Cloudflare, or self-hosted
Capabilities
Routing Architecture
- File-based routing with
app/directory - Dynamic routes (
[slug],[...catchAll],[[...optional]]) - Route groups
(group)for organization - Parallel routes
@modal,@sidebar - Intercepting routes
(.),(..),(..)(..) - Loading and error boundaries per route segment
React Server Components
- Server vs Client component boundaries
'use client'directive placement- Composition patterns (server wrapping client)
- Streaming with Suspense boundaries
- Progressive rendering strategies
Data Fetching
fetch()with automatic deduplication- Caching strategies (
force-cache,no-store,revalidate) generateStaticParams()for static generation- Incremental Static Regeneration (ISR)
- On-demand revalidation with
revalidatePath()/revalidateTag()
Server Actions
- Form mutations with
'use server' - Optimistic updates with
useOptimistic - Progressive enhancement (works without JS)
- Error handling and validation
- Redirect after mutation
Middleware & Edge
middleware.tsfor auth, redirects, rewrites- Edge Runtime vs Node.js Runtime
- Geolocation and conditional routing
- A/B testing and feature flags
Performance Optimization
- Image optimization with
next/image - Font optimization with
next/font - Script loading strategies
- Bundle analysis and code splitting
- Partial prerendering (PPR)
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.
- 8d ago First seen · 328 lines · 54 tokens per session scan A eb059519a522
nextjs-app-router-expert is a skill published in the GitHub repository curiositech/some_claude_skills (219 stars, last pushed 5d ago), licensed MIT. It adds 54 tokens to every session and 2,297 once invoked, about $0.0003 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 2026-09-03.
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