Conciseness

The body is dense with actionable code templates and tables, with almost no prose explaining concepts Claude already knows; each section earns its place despite its length.

Actionability

Provides concrete, copy-paste-ready Swift templates with exact file paths and commands, plus a complete worked example in references; the {Provider} placeholders are justified by the template nature rather than being pseudocode.

Workflow Clarity

A clearly sequenced five-phase TDD workflow (Red → Green per phase) with explicit verification via the closing checklist, including running the existing 300+ test suite.

Progressive Disclosure

The body is an organized overview that signals two real one-level-deep references (antigravity-example.md, provider-icon-guide.md), both verified to exist in the bundle, with easy navigation.

Specificity

Names multiple concrete actions — "adding new AI providers to ClaudeBar using TDD patterns", "creating a usage probe for a CLI tool or local API", "implement provider integration" — matching the "Lists multiple specific concrete actions" anchor.

Completeness

Explicitly answers both what ("Guide for adding new AI providers to ClaudeBar using TDD patterns") and when (a four-item "Use this skill when" clause), satisfying the "both what AND when with explicit triggers" anchor.

Trigger Term Quality

Includes natural phrasings a user would actually say, with quoted triggers like "how do I add a new provider" and "create a provider for X", giving good coverage of natural terms.

Distinctiveness Conflict Risk

The ClaudeBar provider/TDD niche is specific and the triggers ("add a new provider", "create a provider for X") are distinct, making conflict with other skills unlikely.