Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/fmflurry/settings-opencodenpx agentmods add rules/fmflurry/settings-opencode/typescript-testingWrote 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/fmflurry/settings-opencode/typescript-testing)<a href="https://agentmods.dev/rules/fmflurry/settings-opencode/typescript-testing"><img src="https://agentmods.dev/badge/rules/fmflurry/settings-opencode/typescript-testing/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/fmflurry/settings-opencode/typescript-testing"><img src="https://agentmods.dev/badge/rules/fmflurry/settings-opencode/typescript-testing.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 | $0.00000 | $0.00111 |
| Opus 5.5 | $0.00000 | $0.00044 |
| Sonnet 5.5 | $0.00000 | $0.00022 |
| Haiku 4.5 | $0.00000 | $0.00011 |
Grade A, and why
typescript-testing 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 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.
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
TypeScript/JavaScript Testing
This file extends common/testing.md with TypeScript/JavaScript specific content.
E2E Testing
Use Playwright as the E2E testing framework for critical user flows.
Agent Support
- e2e-runner - Playwright E2E testing specialist
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.
- 8d ago First seen · 17 lines · 0 tokens per session scan A 324ded01bb5d
typescript-testing is a cursor rule published in the GitHub repository fmflurry/settings-opencode (171 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 111 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 2026-10-08.
Other cursor rules, from other repositories
no-bare-casts
No bare as casts in production TypeScript. Use blindCast (value) from @internal/utils/casts as the auditable escape hatch, castAs (value) for declarative-only assertions, or rewrite to eliminate the cast. as const is exempt. Test files are exempt.
running-tests
How to run tests, check for failures, and rerun specific failing tests — use the :agent variants of slow commands.
use-ast-factories
Use factory functions for creating AST nodes instead of manual object creation.
demo
Run the Todo example end-to-end demo.
jest
Definitive guidelines for writing robust, maintainable, and performant Jest tests in JavaScript and TypeScript projects.
e2e-playwright
Playwright E2E patterns for Next.js and Fastify API.