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/mrharishkumar/fastapi-cursor-boilerplate/testing-and-securitygit clone --depth 1 https://github.com/mrharishkumar/fastapi-cursor-boilerplateWhat 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 | $0.00200 | $0.00200 |
| Opus 5 | $0.00100 | $0.00100 |
| Sonnet 5 | $0.00040 | $0.00040 |
| Haiku 4.5 | $0.00020 | $0.00020 |
Grade A, and why
testing-and-security 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 and Security
1. Unit and Integration Tests
- Write tests for all endpoints and business logic. Aim for high test coverage. Use the
TestClientprovided by FastAPI for testing routes. - Place tests in the
tests/directory. - Mirror the app structure in tests.
- Use descriptive test names and proper assertions.
2. Environment Variables
- All sensitive information (database credentials, secret keys) must be stored in environment variables, not hardcoded in the source code. Use
python-dotenv.
3. Security
- Use FastAPI's built-in security features, such as
OAuth2PasswordBearerfor token-based authentication. Do not implement custom, insecure authentication methods.
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 · 20 lines · 200 tokens per session scan A 07b3a631ba2c
testing-and-security is a cursor rule published in the GitHub repository mrharishkumar/fastapi-cursor-boilerplate (3 stars, last pushed 12mo ago), licensed MIT. It adds 200 tokens to every session, about $0.0010 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.
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