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/feral-file/ff-cli/35-testing-tddgit clone --depth 1 https://github.com/feral-file/ff-cliWhat 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 | $0.00188 | $0.00188 |
| Opus 5 | $0.00094 | $0.00094 |
| Sonnet 5 | $0.00038 | $0.00038 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
35-testing-tdd 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 Verification Rule
Required sequence
- Write or update focused tests first when behavior changes.
- Implement until tests pass.
- Refactor while keeping tests green.
- Run the full verification commands before handoff or completion.
Constraints
- Do not ship behavior changes without test coverage unless there is a clear, explicit reason.
- Prefer unit tests for business logic and targeted integration coverage for boundary behavior.
- Treat missing or failing tests as part of the work, not follow-up work.
Required verification commands
npm run lint:fix
npm test
npm run build
GROK_API_KEY=dummy node dist/index.js validate examples/sample-playlist.json
GROK_API_KEY=dummy node dist/index.js config validate
Fix failures and rerun until clean.
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 · 29 lines · 188 tokens per session scan A b378b1a91abf
35-testing-tdd is a cursor rule published in the GitHub repository feral-file/ff-cli (5 stars, last pushed 14d ago), licensed MIT. It adds 188 tokens to every session, about $0.0009 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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