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/nwave-ai/nwave/nw-mutation-testnpx skills add nWave-ai/nWave --skill nw-mutation-testgit clone --depth 1 https://github.com/nWave-ai/nWaveWrote 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/nwave-ai/nwave/nw-mutation-test)<a href="https://agentmods.dev/skills/nwave-ai/nwave/nw-mutation-test"><img src="https://agentmods.dev/badge/skills/nwave-ai/nwave/nw-mutation-test.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 5.1 | $0.00033 | $0.01332 |
| Opus 5 | $0.00016 | $0.00666 |
| Sonnet 5 | $0.00007 | $0.00266 |
| Haiku 4.5 | $0.00003 | $0.00133 |
Grade A, and why
nw-mutation-test 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.
How it starts
The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NW-MUTATION-TEST: Feature-Scoped Mutation Testing
Wave: QUALITY_GATE Agent: Crafter (nw-software-crafter)
Overview
Run mutation testing against implementation files from the current feature. Extracts targets from the execution-log.json (see Target extraction)|generates feature-scoped configs|delegates to software-crafter. Uses cosmic-ray (Python)|PIT (Java)|Stryker (JS/TS/C#).
Mutation Testing Strategy
Projects declare a strategy via ## Mutation Testing Strategy in CLAUDE.md: per-feature | nightly-delta | pre-release | disabled.
Default (when unspecified): nightly-delta — the recommended mode. CI runs mutmut nightly against modules changed since the last run (the delta), keeping per-feature delivery gates fast. /nw-mutation-test performs an explicit, on-demand feature-scoped run regardless of strategy; under nightly-delta the in-wave Phase 5 gate is skipped and the work is handled by the CI nightly pipeline.
Target extraction
Implementation files are selected from the execution-log.json (completed_steps[].files_modified.implementation).
Context Files Required
docs/feature/{feature-id}/deliver/execution-log.json- Implementation file extractionscripts/mutation/generate_scoped_configs.py- Automated config generation (if available)
Pre-Invocation
Orchestrator performs before delegating:
- Extract files — Read
execution-log.jsonand extract implementation files fromcompleted_steps[].files_modified.implementation. Gate: file list non-empty. - Verify on disk — Check all extracted files exist on disk. Gate: zero missing files.
- Detect language — Scan config files (pyproject.toml, pom.xml, package.json, etc.) to select tool. Gate: language identified.
- Confirm tests pass — Run
pytest -x {test_scope}(or equivalent). Gate: exit code 0, no failures. - Ensure mutation venv — For Python, verify
.venv-mutation/exists with cosmic-ray installed. Gate:cosmic-ray --versionsucceeds.
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 · 128 lines · 33 tokens per session scan A effe610a3005
nw-mutation-test is a skill published in the GitHub repository nWave-ai/nWave (605 stars, last pushed 6d ago), licensed MIT. It adds 33 tokens to every session and 1,332 once invoked, about $0.0002 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 2026-09-03.
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