Content
81%Weight 40%Scale 1-5Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
A highly actionable, well-sequenced TDD skill with explicit verification gates, error-recovery loops, and a clean one-level reference split. Its main cost is token weight: motivational rhetoric and duplicated enforcement sections could be consolidated without losing instructional value.
Suggestions
Merge the Red Flags list into the Common Rationalizations table (or vice versa) — the two sections enumerate nearly the same anti-patterns twice; one combined table would cut ~25 lines.
Collapse "Overview", "The Iron Law", and "Final Rule" into a single statement of the core rule; all three restate "no production code without a failing test first".
Consider moving the extended Common Rationalizations rebuttals into references/writing-good-tests.md (or a dedicated reference) and keeping only the top few excuses inline, reducing SKILL.md toward an overview-plus-procedure document.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The procedural core is tight and imperative, but the body carries clear redundancy: the Red Flags list repeats the Common Rationalizations table, "Final Rule" restates "The Iron Law", "Overview" restates "Before you edit any production file", and the dot graph plus aphorisms add tokens without adding instruction. Not 2 because no section explains basic concepts Claude already lacks. | 3 / 5 |
Actionability | Fully executable guidance throughout: complete good/bad TypeScript test and implementation examples, concrete commands (`npm test path/to/test.test.ts`), and a worked bug-fix example covering every phase from RED through REFACTOR. Common cases are covered copy-paste ready. | 5 / 5 |
Workflow Clarity | The red-green-refactor sequence has explicit MANDATORY verification checkpoints, feedback loops for error recovery ("Test errors? Fix error, re-run until it fails correctly"; "Test fails? Fix code, not test"), a verification checklist, and a recovery path if production code was edited first. Matches the anchor with validation steps, feedback loops, and a checklist. | 5 / 5 |
Progressive Disclosure | The single reference (references/writing-good-tests.md) is one level deep, clearly signaled, and summarized inline with its key rules, and the file exists in the bundle. Not 5 because the ~320-line body inlines long rationalization and red-flag content that could be split out, leaving SKILL.md heavier than a clear overview. | 4 / 5 |
Total | 17 / 20 Passed |