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.
git clone --depth 1 https://github.com/kleosr/kleosrulesWrote 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/rules/kleosr/kleosrules/next)<a href="https://agentmods.dev/rules/kleosr/kleosrules/next"><img src="https://agentmods.dev/badge/rules/kleosr/kleosrules/next/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/rules/kleosr/kleosrules/next"><img src="https://agentmods.dev/badge/rules/kleosr/kleosrules/next.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 | $0.00334 | $0.00334 |
| Opus 5.5 | $0.00134 | $0.00134 |
| Sonnet 5.5 | $0.00067 | $0.00067 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
next 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 1mo 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.
What it actually says
Next.js
Confirm next in the owning package.json first; globs are candidates, not proof. If the owning package has no next, this file is inert.
Before Write, Read the matching guide under node_modules/next/dist/docs/ from this app's package (in a monorepo, not the repo root if next is nested). Heed deprecations. If that folder is missing, inspect the installed version + lockfile; a missing folder does not prove a version. Fall back to version-matched docs (Docs MCP / versioned site / project notes) or ask. Do not guess APIs. Do not run a codemod unless asked.
Route by the file you touch: app/ files use App Router; pages/ files use Pages. Never mix routers in one file.
Hard
- Fetch in Server Components. No
useEffectfor initial server data. cookies()/headers(): follow this version's docs (often async).- No
getServerSideProps/getStaticPropsinapp/. Nonext/navigationin Pages. - No Vite
import.meta.envfor Next public env; useprocess.envas this version documents.
Repo manager for installs.
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.
- 1mo ago Changed · -2 lines · +334 tokens per session 145e7ad6303e
- 1mo ago Changed 2d200d54a26c
- 1mo ago Changed cff4f172cc16
- 1mo ago Changed 1644d2445520
- 1mo ago First seen · 24 lines · 0 tokens per session scan A fb197fcbd9b9
next is a cursor rule published in the GitHub repository kleosr/kleosrules (0 stars, last pushed 1mo ago), licensed MIT. It adds 334 tokens to every session, about $0.0013 per session on Opus 5.5. 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.
Other cursor rules, from other repositories
nextjs
Rules for Next.js projects (App Router and Pages Router).
react
Rules for React component files (any framework).
10-imports
Import policy — React Router only, never Remix or react-router-dom. See rules/core/imports.md.
20-frontend-nextjs
Next.js frontend rules.
tanstack-query
TanStack Query / React Query: query keys, mutations, caching, optimistic updates.
expo
Expo/React Native: native modules, navigation, platform-specific code.