Content
85%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
A dense, actionable, well-sequenced guide with executable commands, a complete config example, and clear CI integration. The only weakness is mild verbosity — a promotional Overview blockquote, a duplicated When-to-use section, and a broken filler sentence that could be trimmed.
Suggestions
Remove the Overview blockquote about Stryker's history/framework support — it is promotional context Claude does not need; keep only the one-line definition of mutation testing.
Delete or tighten the broken sentence "A green suite with high mutation-survival rate is the bug coverage hides" so it reads as a clear statement rather than filler.
Cut the "When to use" section or merge it into the Overview, since the frontmatter description already states the same ≥80% coverage trigger.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Mostly efficient, but the Overview blockquote ("Stryker started as a pure JavaScript mutation testing framework...") is promotional history Claude does not need, the "When to use" section restates the description's triggers, and "A green suite with high mutation-survival rate is the bug coverage hides" is a broken filler sentence; not level 3 because these tokens do not earn their place. | 2 / 3 |
Actionability | Fully executable guidance throughout — `npm install`, `npx stryker init`, `npx stryker run --incremental`, a complete `stryker.conf.json`, and a CI YAML block are copy-paste ready; not level 2 because the examples are complete rather than pseudocode or missing key details. | 3 / 3 |
Workflow Clarity | Six numbered steps (Install → Initialize → Run → Report → Incremental → CI) with an explicit threshold gate ("< break (50) → red, exit code != 0") and a feedback loop (survived mutant → "Add a test for qty = 0"); not level 2 because validation gating and error-recovery guidance are present. | 3 / 3 |
Progressive Disclosure | A single well-sectioned file (Overview, When to use, Steps 1–6, Anti-patterns, Limitations, References) with one-level references — the external Stryker docs URL via [si] and sibling-skill pointers — and no nested references; no bundle files exist, and the organization is clear with no content wrongly needing to be split out. | 3 / 3 |
Total | 11 / 12 Passed |