errors-and-async-safety

errors-and-async-safety is a cursor rule for Cursor from grafana/grafana-pathfinder-app. It costs 42 tokens per session (723 once invoked), scanned A, original, AGPL-3.0.

A set of review rules for React applications covering missing error boundaries and promises that fail without being handled. An error boundary is a component that prevents one broken part of a page from taking down the whole interface.

In plain words
What is it for?
Use it when reviewing routes, component trees, or chains of asynchronous operations for anti-patterns R6 and R10.
Why use it?
It helps catch crashes and hidden asynchronous errors before they affect users.

Cursor rule for Cursor ✓ vendor

Written for Cursor: installed under .cursor/.

Good fit Use it when reviewing routes, component trees, or chains of asynchronous operations for anti-patterns R6 and R10.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/grafana/grafana-pathfinder-app/errors-and-async-safety
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 errors-and-async-safety

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

Your own site · 80×15
<a href="https://agentmods.dev/rules/grafana/grafana-pathfinder-app/errors-and-async-safety"><img src="https://agentmods.dev/badge/rules/grafana/grafana-pathfinder-app/errors-and-async-safety.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 42 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 723 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00042 $0.00723
Opus 5 $0.00021 $0.00362
Sonnet 5 $0.00008 $0.00145
Haiku 4.5 $0.00004 $0.00072

Measured 8d ago against content hash 8b66a29d8941, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

errors-and-async-safety scanned grade A with 1 finding 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

fetch(url)
.cursor/rules/react-antipatterns/errors-and-async-safety.mdc · 125 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. 8d ago First seen · 125 lines · 42 tokens per session scan A 8b66a29d8941

Subscribe to this mod's changes

errors-and-async-safety is a cursor rule published in the GitHub repository grafana/grafana-pathfinder-app (19 stars, last pushed yesterday), licensed AGPL-3.0. It adds 42 tokens to every session and 723 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.