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 skills add nWave-ai/nWave --skill nw-tdd-cross-languagegit 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-tdd-cross-language)<a href="https://agentmods.dev/skills/nwave-ai/nwave/nw-tdd-cross-language"><img src="https://agentmods.dev/badge/skills/nwave-ai/nwave/nw-tdd-cross-language/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nwave-ai/nwave/nw-tdd-cross-language"><img src="https://agentmods.dev/badge/skills/nwave-ai/nwave/nw-tdd-cross-language.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00038 | $0.02577 |
| Opus 5.5 | $0.00015 | $0.01031 |
| Sonnet 5.5 | $0.00008 | $0.00515 |
| Haiku 4.5 | $0.00004 | $0.00258 |
Grade A, and why
nw-tdd-cross-language 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 1mo 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 — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cross-Language Paradigm Porting Guide
The state-delta + property-based testing paradigm (see nw-tdd-methodology::Paradigm Mandate) is shipped natively in Python via nwave_ai.state_delta. This skill documents how to apply the same paradigm in other languages with idiomatic adaptations.
Open source positioning (nwave-ai master): Python canonical + DIY porting guide. Users in other languages port the pattern using their language's PBT library + a small state-delta shim (~70-150 LOC).
Enterprise positioning (nwave-pro bundle, deferred): pre-built language packages with tested implementations, kept consistent across versions.
Per-language framework + PBT library matrix
| Language | Test framework | PBT library | State-delta port size | Idiomatic notes |
|---|---|---|---|---|
| Python | pytest | Hypothesis | shipped (nwave_ai.state_delta, ~250 LOC) |
Reference implementation. Closure-over-parameters predicates, frozen dataclass Violation. |
| TypeScript / JS | vitest, jest, mocha | fast-check |
~80 LOC | Generics over Old, New. Predicate = (old: O, new: N) => boolean. Use expect.fail() for AssertionError equivalent. |
| Java | JUnit 5 | jqwik |
~120 LOC | Verbose generics (Predicate<O, N>). Builder pattern for assertStateDelta(...) fluent API. Use AssertionError. |
| Kotlin | kotest (built-in PBT) | native | ~80 LOC | DSL idiomatic — assertStateDelta { universe(...) ; expected(...) }. Lambda predicates fit naturally. |
| F# / .NET | xUnit, NUnit | FsCheck |
~70 LOC | Functional fit naturale. Discriminated unions for Violation, partial application for predicate factories. |
| Rust | cargo test | proptest |
~100 LOC | Fn traits for predicates. struct Violation with derive(Clone, Debug). Returns Result<(), AssertionError>. |
| Go | testing | gopter, quick |
~150 LOC | More verbose due to lack of closures over generics. Predicate = function accepting interface{}. Use t.Errorf for assertion. |
| OCaml | alcotest | qcheck |
~70 LOC | Functional fit naturale. Variant types for Violation, partial application natural. |
| Scala | ScalaTest | ScalaCheck |
~80 LOC | Pattern matching for Violation, implicit conversions for fluent predicate composition. |
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.
- 1mo ago First seen · 269 lines · 38 tokens per session scan A 3091d8a09ca9
nw-tdd-cross-language is a skill published in the GitHub repository nWave-ai/nWave (620 stars, last pushed 1mo ago), licensed MIT. It adds 38 tokens to every session and 2,577 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-06.
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