nextjs-separate-server-client-utilities

A Next.js coding rule for keeping server-only and browser-side utilities in separate files. Next.js is a framework for building web applications with React.

In plain words
What is it for?
Use it when organizing utility files in a Next.js project.
Why use it?
It helps avoid bundling errors caused by putting code meant for the server into browser code, or the other way around.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/gmoncor/agentic-engineering-framework/nextjs-separate-server-client-utilities
Clone the repo
git clone --depth 1 https://github.com/gmoncor/agentic-engineering-framework

Made for: Cursor.

Per session 1,056 This file is loaded in full into every session.
When invoked 1,056 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.01056 $0.01056
Opus 5 $0.00528 $0.00528
Sonnet 5 $0.00211 $0.00211
Haiku 4.5 $0.00106 $0.00106

Measured 2d ago against content hash a644c8fd3954, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

nextjs-separate-server-client-utilities 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 2d 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.

.cursor/rules/nextjs-separate-server-client-utilities.mdc · 122 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 2d ago First seen · 122 lines · 1,056 tokens per session scan A a644c8fd3954

Subscribe to this mod's changes

nextjs-separate-server-client-utilities is a cursor rule published in the GitHub repository gmoncor/agentic-engineering-framework (5 stars, last pushed 3d ago), with no licence file. It adds 1,056 tokens to every session, about $0.0053 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.