Content
75%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.
An excellent API-pattern reference: every code example is executable and specific to FoundationModels, with a well-organized availability-first structure. The main cost is token redundancy — duplicate trigger sections, generic prompt-writing guidance, and the same constraints restated across three sections — plus a missed opportunity to split the longer SwiftUI material into a reference file.
Suggestions
Merge the near-duplicate 'When to Activate' and 'When to Use' sections into one trigger section, saving ~10 lines.
Delete the 'Key points for instructions' list (generic prompt-writing Claude already knows) and deduplicate the .content-vs-.output, 4,096-token, and availability points that currently appear across the Key Design Decisions table, Best Practices, and Anti-Patterns.
Move the SwiftUI streaming integration example into a references/ file (e.g. references/streaming-ui.md) linked from the main body, keeping SKILL.md as the lean overview.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Most of the file is FoundationModels-specific API code Claude does not know and every example earns its place, but it could be tightened in several places: 'Key points for instructions' re-teaches generic prompt-writing, 'When to Activate' and 'When to Use' are near-duplicate sections, and the .content-vs-.output, 4,096-token, and availability points each repeat 2–3 times across the Key Design Decisions table, Best Practices, and Anti-Patterns. Not 4: the tightening opportunities span multiple sections, exceeding 'minor instances'. | 3 / 5 |
Actionability | Every section contains complete, executable Swift: the availability switch, session creation with instructions, @Generable structs with @Guide constraints, a full Tool conformance with error handling, and streamResponse with SwiftUI .task integration. Not 4: there are no gaps — the code covers the common cases copy-paste ready. | 5 / 5 |
Workflow Clarity | Each pattern is clearly numbered (e.g. '1. Define a Generable Type / 2. Request Structured Output') with an explicit upfront checkpoint ('Always check model availability before creating a session') and do/catch error handling shown for tools and streaming. Not 5: it is a pattern catalog rather than a single end-to-end workflow with explicit validate-fix-retry feedback loops; not 3: checkpoints and error recovery are present, not merely implied. | 4 / 5 |
Progressive Disclosure | No bundle files exist, and the single SKILL.md is cleanly sectioned with consistent headers and no nested references — appropriate for a mid-sized skill. Not 5: at ~240 lines, material such as the SwiftUI streaming integration could arguably live in a references/ file, so the split is good but not optimal. | 4 / 5 |
Total | 16 / 20 Passed |