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 ivanshtokov/copilot-kit --skill nextjs-best-practicesgit clone --depth 1 https://github.com/ivanshtokov/copilot-kitWrote 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/ivanshtokov/copilot-kit/nextjs-best-practices)<a href="https://agentmods.dev/skills/ivanshtokov/copilot-kit/nextjs-best-practices"><img src="https://agentmods.dev/badge/skills/ivanshtokov/copilot-kit/nextjs-best-practices.svg" alt="Measured on agentmods" 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 | $0.00022 | $0.00928 |
| Opus 5 | $0.00011 | $0.00464 |
| Sonnet 5 | $0.00004 | $0.00186 |
| Haiku 4.5 | $0.00002 | $0.00093 |
Grade A, and why
nextjs-best-practices 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 7d 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.
This is a copy
94% identical to nextjs-best-practices — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 203 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Best Practices
Principles for Next.js App Router development.
1. Server vs Client Components
Decision Tree
Does it need...?
│
├── useState, useEffect, event handlers
│ └── Client Component ('use client')
│
├── Direct data fetching, no interactivity
│ └── Server Component (default)
│
└── Both?
└── Split: Server parent + Client child
By Default
| Type | Use |
|---|---|
| Server | Data fetching, layout, static content |
| Client | Forms, buttons, interactive UI |
2. Data Fetching Patterns
Fetch Strategy
| Pattern | Use |
|---|---|
| Default | Static (cached at build) |
| Revalidate | ISR (time-based refresh) |
| No-store | Dynamic (every request) |
Data Flow
| Source | Pattern |
|---|---|
| Database | Server Component fetch |
| API | fetch with caching |
| User input | Client state + server action |
3. Routing Principles
File Conventions
| File | Purpose |
|---|---|
page.tsx |
Route UI |
layout.tsx |
Shared layout |
loading.tsx |
Loading state |
error.tsx |
Error boundary |
not-found.tsx |
404 page |
Route Organization
| Pattern | Use |
|---|---|
Route groups (name) |
Organize without URL |
Parallel routes @slot |
Multiple same-level pages |
Intercepting (.) |
Modal overlays |
4. API Routes
Route Handlers
| Method | Use |
|---|---|
| GET | Read data |
| POST | Create data |
| PUT/PATCH | Update data |
| DELETE | Remove data |
Best Practices
- Validate input with Zod
- Return proper status codes
- Handle errors gracefully
- Use Edge runtime when possible
5. Performance Principles
Image Optimization
- Use next/image component
- Set priority for above-fold
- Provide blur placeholder
- Use responsive sizes
Bundle Optimization
- Dynamic imports for heavy components
- Route-based code splitting (automatic)
- Analyze with bundle analyzer
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.
- 7d ago First seen · 203 lines · 22 tokens per session scan A dc2588cf6a92
nextjs-best-practices is a skill published in the GitHub repository ivanshtokov/copilot-kit (2 stars, last pushed 7mo ago), licensed MIT. It adds 22 tokens to every session and 928 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to nextjs-best-practices, differing in 1 line, and is treated as a copy.
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