hooks-and-effects

hooks-and-effects is a cursor rule for Cursor from grafana/grafana-pathfinder-app. It costs 57 tokens per session (1,842 once invoked), scanned A, original, AGPL-3.0.

A set of React code-review rules for common hook and effect problems, including missing cleanup, outdated captured values, incorrect dependencies, conditional hooks, and uncleared event listeners.

In plain words
What is it for?
Use it when reviewing or writing React hooks, effects, subscriptions, event listeners, and related cleanup logic, especially for rules R1, R2, R3, R8, R13, or R15.
Why use it?
It helps catch bugs caused by React effects and hooks that keep running, use old data, or break React’s calling rules.

Cursor rule for Cursor ✓ vendor

Written for Cursor: installed under .cursor/.

Good fit Use it when reviewing or writing React hooks, effects, subscriptions, event listeners, and related cleanup logic, especially for rules R1, R2, R3, R8, R13, or R15.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/grafana/grafana-pathfinder-app/hooks-and-effects
About the project

grafana-pathfinder-app is a Grafana plugin that adds documentation and guided tutorials inside Grafana's interface. It helps Grafana users find context-relevant help, follow interactive learning paths, and track progress without leaving the application. Its catalogue entries define guidance for using the plugin.

grafana/grafana-pathfinder-app · 19 stars · on GitHub · grafana.com

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.

Clone the repo
git clone --depth 1 https://github.com/grafana/grafana-pathfinder-app

Made for: Cursor.

Wrote 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.

agentmods badge for hooks-and-effects

README.md
[![agentmods](https://agentmods.dev/badge/rules/grafana/grafana-pathfinder-app/hooks-and-effects/github.svg)](https://agentmods.dev/rules/grafana/grafana-pathfinder-app/hooks-and-effects)
Your own site
<a href="https://agentmods.dev/rules/grafana/grafana-pathfinder-app/hooks-and-effects"><img src="https://agentmods.dev/badge/rules/grafana/grafana-pathfinder-app/hooks-and-effects/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.

agentmods 80×15 button for hooks-and-effects

Your own site · 80×15
<a href="https://agentmods.dev/rules/grafana/grafana-pathfinder-app/hooks-and-effects"><img src="https://agentmods.dev/badge/rules/grafana/grafana-pathfinder-app/hooks-and-effects.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,842 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00057 $0.01842
Opus 5 $0.00028 $0.00921
Sonnet 5 $0.00011 $0.00368
Haiku 4.5 $0.00006 $0.00184

Measured 10d ago against content hash 7d83b6aa9872, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

hooks-and-effects 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 10d 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/react-antipatterns/hooks-and-effects.mdc · 282 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 10d ago First seen · 282 lines · 57 tokens per session scan A 7d83b6aa9872

Subscribe to this mod's changes

hooks-and-effects is a cursor rule published in the GitHub repository grafana/grafana-pathfinder-app (19 stars, last pushed today), licensed AGPL-3.0. It adds 57 tokens to every session and 1,842 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 2026-08-30.

Related

Other cursor rules, from other repositories