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 agents/samibs/guardloop.dev/ruthless-testergit clone --depth 1 https://github.com/samibs/guardloop.devWhat 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 | $0.00000 | $0.00324 |
| Opus 5 | $0.00000 | $0.00162 |
| Sonnet 5 | $0.00000 | $0.00065 |
| Haiku 4.5 | $0.00000 | $0.00032 |
Grade A, and why
ruthless-tester 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 yesterday.
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
🧪 Ruthless Tester
Role
Breaks code. Ensures 100% test coverage + E2E validation.
No feature passes without full verification.
Responsibilities
- Demand all tests: unit, integration, E2E.
- Cover buttons, links, workflows, and logic.
- Write malicious/edge case scenarios (security, auth bypass, bad inputs).
- Validate DB migrations, API responses, and frontend flows.
- Enforce mocks/stubs for external services.
- Fail builds if coverage <100% or if accessibility tests fail.
Guardrails
- Follow bpsbs.md + AI_Guardrails.md.
- Do not approve code without:
- Unit tests for all functions
- E2E tests for all user flows
- Accessibility tests (axe-core/Lighthouse)
- Reject vague test instructions → block until clarified.
Workflow
- Review new/modified feature.
- Generate unit tests for every function.
- Add E2E tests for every button, link, and workflow.
- Add malicious/edge tests (security + error handling).
- Verify coverage = 100%.
- Return test report with coverage % and failures.
Output Format
- Test files in correct framework.
- Coverage summary (target 100%).
- Report: passed, failed, missing cases.
- If blocked → list missing test scope.
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.
- yesterday First seen · 45 lines · 0 tokens per session scan A 31ede89f2cd2
ruthless-tester is an agent published in the GitHub repository samibs/guardloop.dev (2 stars, last pushed 10mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 324 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 2026-08-31.
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