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 agentmods add rules/vibestackdev/vibe-stack/nextjs15-paramsgit clone --depth 1 https://github.com/vibestackdev/vibe-stackWhat 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 | $0.00000 | $0.00389 |
| Opus 5 | $0.00000 | $0.00195 |
| Sonnet 5 | $0.00000 | $0.00078 |
| Haiku 4.5 | $0.00000 | $0.00039 |
Grade A, and why
nextjs15-params 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 yesterday.
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.
What it actually says
Next.js 15 Async Params (BREAKING CHANGE)
CRITICAL: In Next.js 15+, params and searchParams are ASYNC Promises.
This is a breaking change from Next.js 14. The AI MUST await them.
Rule: Always Use Promise Types
✅ CORRECT (Next.js 15):
type PageProps = {
params: Promise<{ slug: string }>
searchParams: Promise<{ [key: string]: string | string[] | undefined }>
}
export default async function Page({ params, searchParams }: PageProps) {
const { slug } = await params;
const search = await searchParams;
}
❌ WRONG (outdated Next.js 14 pattern — will crash silently):
// DO NOT GENERATE THIS PATTERN
export default function Page({ params }: { params: { slug: string } }) {
const { slug } = params; // BREAKS: params is a Promise in Next.js 15
}
Rule: generateMetadata Also Uses Async Params
export async function generateMetadata({ params }: { params: Promise<{ slug: string }> }) {
const { slug } = await params;
return { title: `Post: ${slug}` }
}
Rule: Layout Components MUST Await Params
export default async function Layout({
children,
params,
}: {
children: React.ReactNode
params: Promise<{ teamId: string }>
}) {
const { teamId } = await params;
return <div>{children}</div>
}
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.
- yesterday First seen · 56 lines · 0 tokens per session scan A 5fa107fdcf43
nextjs15-params is a cursor rule published in the GitHub repository vibestackdev/vibe-stack (7 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 389 tokens. 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.
Other cursor rules, from other repositories
cursor
SEO audit and implementation for Next.js, Remix, and React SPAs. Auto-attached to page, layout, and route files. Covers meta tags, Open Graph, Twitter cards, JSON-LD, sitemaps, robots.txt, i18n/hreflang, and image SEO.
diagnose
name: Issue Re-Diagnosis and Fix Template description: Template for AI to re-diagnose and fix issues that weren't resolved previously. globs.
always-on
Cursor rule "always-on" from jjcall/vibeship-boilerplate, covering core persona, how you work in this project, how you verify and validate, when you should ask for feedback or approval and how you communicate.
request
name: Issue Re-Diagnosis and Fix Template description: Template for AI to re-diagnose and fix issues that weren't resolved previously. globs.
upgrade-tests
// ✅ CORRECT: Upgrade package pattern await using ctx = testReactResource(appRouter, { server: { // server configuration }, client(opts) { return { links: [ httpLink({ url: opts.httpUrl, // client configuration }), ], }; }, }).
react-query-tests
// ✅ CORRECT: Legacy React Query pattern const ctx = konn() .beforeEach(() => createAppRouter()) .afterEach((ctx) => ctx?.close?.()) .done().