Conciseness

The body is efficient and assumes competence (e.g., "SwiftLint enforces Swift style and conventions by linting source files against a configurable rule set" is one line of scope, not a tutorial), with executable snippets throughout. However, there is minor duplication that could be trimmed: the --fix-in-build-phase warning appears in both "Autocorrect" and "Common Mistakes" #1, and baseline workflow guidance is repeated across "Baselines", "Rule Selection Strategy", and "CI Integration". This fits the 4 anchor (efficient, minor instances that could be trimmed) rather than the 5 anchor (every token earns its place).

Actionability

Guidance is fully executable and copy-paste ready: a complete Package.swift plugin dependency and target declaration, a full starter .swiftlint.yml, exact suppression comment syntax (swiftlint:disable:next/this/previous), baseline commands ("swiftlint --write-baseline .swiftlint.baseline"), the CI lint command ("swiftlint --strict --reporter sarif > swiftlint.sarif"), and a working child config example. The only placeholder, `<reviewed-version>`, is justified by the version-pinning guidance. This matches the 5 anchor; the 4 anchor would require missing key details.

Workflow Clarity

Multi-step processes are clearly sequenced with explicit validation and feedback loops: for existing codebases, "Create a baseline... Run the same strict, baseline-aware command used by CI and fix every new violation. Re-run until green", and "run the exact CI lint command locally... On a nonzero exit, inspect and fix the new violations, then rerun the same command until it passes; do not regenerate the baseline merely to hide the failure". The "Review Checklist" section provides a final checkpoint list. This matches the 5 anchor (explicit validation steps, error-recovery loops, checklists) rather than the 4 anchor (minor validation gaps).

Progressive Disclosure

SKILL.md is a clear overview with well-signaled, one-level-deep references that all exist in the bundle: each section ends with a targeted pointer such as "For full configuration details... see references/adoption-and-configuration.md" and "For baseline workflows and rollout strategy, see references/rules-suppressions-and-baselines.md", and a References section lists all five reference files with scope descriptions. No nested references or inlined bulk content that belongs elsewhere. This matches the 5 anchor.

Specificity

The description lists multiple concrete capabilities: "Configures and enforces SwiftLint... using build tool plugins, run scripts, and CI", plus specific config keys ("disabled_rules, opt_in_rules, only_rules, analyzer_rules"), "baselines, autocorrect, swiftlint:disable suppressions, reporter formats (sarif, json, checkstyle), strict and lenient modes". Coverage is comprehensive with no vague filler, matching the 5 anchor (multiple specific concrete actions, comprehensive coverage); the 4 anchor would require minor gaps that are not present.

Completeness

It explicitly answers both questions: what it does ("Configures and enforces SwiftLint in Swift projects... Covers .swiftlint.yml configuration, baselines, autocorrect, suppressions, reporter formats... rollout strategies") and when to use it ("Use when setting up SwiftLint, configuring lint rules, suppressing warnings, creating baselines..."). This is a textbook match for the 5 anchor; a 4 would have a less explicit or specific 'when' clause.

Trigger Term Quality

Natural user phrasings are comprehensively covered: "setting up SwiftLint, configuring lint rules, suppressing warnings, creating baselines, choosing between build tool plugin and run script, or integrating SwiftLint into CI", along with concrete tokens like ".swiftlint.yml", "swiftlint:disable", and "SwiftLintBuildToolPlugin". This matches the 5 anchor (comprehensive natural terms including synonyms and file extensions); the 4 anchor would need notable missing terms, which are absent.

Distinctiveness Conflict Risk

The description occupies a clear niche (SwiftLint lint enforcement and setup) with distinct triggers ("setting up SwiftLint", "creating baselines", "choosing between build tool plugin and run script") that would not fire for a general Swift style or architecture skill. Conflict risk is minimal, matching the 5 anchor; the 4 anchor would apply only if it overlapped noticeably with a closely related skill.