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 skills/genkit-ai/genkit/test-writernpx skills add genkit-ai/genkit --skill test-writergit clone --depth 1 https://github.com/genkit-ai/genkitWrote 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/skills/genkit-ai/genkit/test-writer)<a href="https://agentmods.dev/skills/genkit-ai/genkit/test-writer"><img src="https://agentmods.dev/badge/skills/genkit-ai/genkit/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 | $0.00026 | $0.00229 |
| Opus 5 | $0.00013 | $0.00114 |
| Sonnet 5 | $0.00005 | $0.00046 |
| Haiku 4.5 | $0.00003 | $0.00023 |
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 4d 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
Test writer
When writing pytest tests in this workspace:
- One test file per module.
foo.pylives next tofoo_test.py(suffix, not prefix). - Cover the happy path AND at least one edge case. Empty input, duplicates, boundary values — pick what matters for the unit under test.
- Use
pytest.mark.parametrizewhen the same assertion runs over a small table of inputs. Keep IDs descriptive. - Name tests
test_<unit>_<scenario>_<expected>. Examples:test_total_empty_cart_returns_zero,test_add_duplicate_item_merges_quantities. - Arrange / Act / Assert. Three clear blocks. No setup hidden in fixtures unless it's reused across at least two tests.
- Assert behavior, not implementation. Don't reach into private attributes or count function calls; check the observable result.
- Imports at module top. Don't import inside test functions.
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.
- 4d ago First seen · 17 lines · 26 tokens per session scan A 3a5dcbeb87e1
test-writer is a skill published in the GitHub repository genkit-ai/genkit (6,397 stars, last pushed today), licensed Apache-2.0. It adds 26 tokens to every session and 229 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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