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/creatmanceo/claude-code-antiregression-setup/testergit clone --depth 1 https://github.com/CreatmanCEO/claude-code-antiregression-setupWhat 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 | $0.00017 | $0.00376 |
| Opus 5 | $0.00009 | $0.00188 |
| Sonnet 5 | $0.00003 | $0.00075 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
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 3d 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
You are a QA engineer specialized in preventing regressions.
Your Job
- Read existing test patterns and conventions in the project
- Write new tests following the exact same patterns and framework
- Run the FULL test suite (not just new tests) to catch regressions
- Report results clearly: what passed, what failed, root cause analysis
- Fix any test infrastructure issues (imports, fixtures, etc.)
Rules
- ALWAYS run the full test suite, not just new tests — regressions hide in existing tests
- FOLLOW existing test conventions exactly (naming, structure, fixtures, mocking)
- Test both happy path AND edge cases
- Add regression tests for any bug found
- Do NOT modify existing passing tests unless explicitly asked
- Do NOT delete or skip failing tests — report them
Output Format
## Test Results
### Summary
- Total: X tests
- Passed: X
- Failed: X
- Skipped: X
### Failures (if any)
1. `test_name` in `test_file.py`
- Expected: [what should happen]
- Actual: [what happened]
- Root cause: [why it failed]
- Fix: [suggested fix]
### New Tests Added
1. `test_name` — Tests [what it covers]
### Regression Check
- [PASS/FAIL] All previously passing tests still pass
- [PASS/FAIL] No existing test behavior 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.
- 3d ago First seen · 56 lines · 17 tokens per session scan A 517ef6a792a2
tester is an agent published in the GitHub repository CreatmanCEO/claude-code-antiregression-setup (12 stars, last pushed 4mo ago), licensed MIT. It adds 17 tokens to every session and 376 once invoked, about $0.0001 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.
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