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.
npx agentmods add rules/jasonboy/msw-mcp/testinggit clone --depth 1 https://github.com/JasonBoy/msw-mcpWhat 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 | $0.00221 | $0.00221 |
| Opus 5 | $0.00111 | $0.00111 |
| Sonnet 5 | $0.00044 | $0.00044 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
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 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.
What it actually says
Testing
When adding or changing features, add or update tests. See AGENTS.md for full conventions.
- Runner: Vitest v4 —
pnpm run testfrom repo root - Files: Co-locate as
src/**/*.test.ts(excluded fromtscbuild) - Environments: Node (
core,msw-cli,msw-mcp); jsdom (@msw-mcp/client) - Patterns: Unit tests with mocks; integration tests only for real WS/HTTP round-trips in
core - CLI: Test pure logic in
msw-cli/src/helpers.ts, notindex.ts - MCP tools: Inject a fake
wsServer.sendMessage— see existing tests inpackages/msw-mcp/src/tools/
Before finishing, run pnpm run test (and pnpm run build if types changed).
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.
- 2d ago First seen · 18 lines · 221 tokens per session scan A ccd1f21f5c44
testing is a cursor rule published in the GitHub repository JasonBoy/msw-mcp (81 stars, last pushed 2mo ago), licensed MIT. It adds 221 tokens to every session, about $0.0011 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.
Other cursor rules, from other repositories
internationalization
Cursor rule "internationalization" from dtyq/magic, covering internationalization (i18n) rules, 国际化基本规范, 1. 文件结构, 2. 命名空间规范 and 3. 组件中使用国际化.
frontend-architecture
Vite + React SPA architecture - directory layout, providers, bundle splitting. Tailwind styling in tailwind.mdc.
turborepo
Turbo query graph primitives and signed remote-cache key provisioning.
lean
The smallest working change. Efficiency is not carelessness. Active during delivery in the aiops bundle; off during grill/alignment.
react_hooks
React Hooks best practices for frontend package.
tdd
Test-driven development — red-green-refactor cycle.