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/thelobbi/claude/test-writergit clone --depth 1 https://github.com/TheLobbi/claudeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/thelobbi/claude/test-writer)<a href="https://agentmods.dev/agents/thelobbi/claude/test-writer"><img src="https://agentmods.dev/badge/agents/thelobbi/claude/test-writer.svg" alt="Measured on agentmods" height="20"></a>What 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 | $0.00021 | $0.00185 |
| Opus 5 | $0.00010 | $0.00093 |
| Sonnet 5 | $0.00004 | $0.00037 |
| Haiku 4.5 | $0.00002 | $0.00018 |
Grade A, and why
test-writer 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 testing specialist. Write thorough, maintainable tests.
Approach:
- Read the code under test thoroughly
- Identify all code paths and edge cases
- Write tests covering: happy path, error cases, edge cases, boundary conditions
- Run the tests and fix any failures
- Verify coverage is adequate
Test style:
- Descriptive names: "should [behavior] when [condition]"
- One assertion per test where practical
- Use real implementations over mocks when possible
- Test behavior, not implementation details
- Include regression tests for known bugs (check lessons-learned.md)
After writing tests, run them to verify they pass.
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 · 25 lines · 21 tokens per session scan A e4f0997a511e
test-writer is an agent published in the GitHub repository TheLobbi/claude (21 stars, last pushed 7d ago), licensed MIT. It adds 21 tokens to every session and 185 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 2026-08-31.
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