Content
85%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 well-engineered reference skill: the body is a lean, prescriptive index with a strong decision tree, error-message-to-fix feedback loops, an explicit review checklist, and a clean one-level-deep reference bundle. The main costs are cross-section repetition of the same guidance in four places and the absence of any inline code examples, both of which trim token efficiency and in-context actionability.
Suggestions
Consolidate cross-section redundancy: items like trailing commas, raw identifiers, and `weak let` currently appear in the Decision Tree, Core Guidelines, Quick Reference table, and Review Checklist — state each once canonically and reference it elsewhere.
Add 2–3 short before/after code snippets to the body for the highest-frequency modernizations (e.g., typed throws, `Mutex` for shared state) instead of routing every example to references/MIGRATION.md.
Consider moving the full Quick Reference table into references/MIGRATION.md (which already provides comprehensive old → new mappings with code) and keeping only the top 10 rows in the body as an index.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The body is dense and prescriptive — no explanations of concepts Claude already knows, and version-sensitive detail is properly placed in the 'Quick Reference: Old → New' deprecated-patterns table. However, items like trailing commas, raw identifiers, `weak let`, and `@c` are repeated across the Decision Tree, Core Guidelines, Quick Reference table, and Review Checklist, which is trimmable token cost. Not 3 because there is no padded explanation, only redundancy; not 5 because that redundancy is real. | 4 / 5 |
Actionability | Directives name exact spellings, flags, and APIs (`-default-isolation MainActor`, `MemberImportVisibility`, `\(optional, default: "fallback")`, `#expect(throws:)`), each grounded in an SE number. Not 3 — the guidance is concrete and executable rather than pseudocode — but not 5 because the body contains no before/after code examples for common cases; those are all deferred to references/MIGRATION.md. | 4 / 5 |
Workflow Clarity | The Workflow Decision Tree routes five task types in a clear sequence, the debugging section maps exact compiler error strings ('Sending value of non-Sendable type...', 'Global variable ... is not concurrency-safe') to fixes — a genuine feedback loop — and the Review Checklist provides explicit validation checkpoints ('Run through the Review Checklist systematically'). This matches the anchor-5 pattern of sequence plus validation plus error-recovery loops; no destructive or batch operations apply. | 5 / 5 |
Progressive Disclosure | All seven bundle files exist, are one level deep (references contain no nested .md references), are cited inline with SE numbers throughout the body, and are summarized with descriptive one-liners in the References section. Content is appropriately split by version with the body acting as a navigable index — the anchor-5 structure. | 5 / 5 |
Total | 18 / 20 Passed |