Conciseness

The body is command-first and lean, but the "When to Build" section repeats trigger guidance already carried by the description, and "e.g., macOS 26 Tahoe" adds version-specific detail; these are minor instances that could be trimmed, fitting anchor 4 rather than 'every token earns its place'.

Actionability

Fully executable, copy-paste-ready commands throughout: project discovery (find, xcodebuild -list), complete build templates for both project and workspace with DEVELOPER_DIR set, and a failure table with exact fixes (xcodebuild -resolvePackageDependencies, CODE_SIGN_IDENTITY="" CODE_SIGNING_ALLOWED=NO), covering the common cases.

Workflow Clarity

A clear ordered sequence (locate project, list schemes, build, interpret results) with an explicit error-recovery feedback loop ("read each error... help the user fix them. After fixing, re-run the build to verify") and a fallback for unclear output; this is a simple, non-destructive build task where the single workflow is unambiguous, so the simple-skill exception applies.

Progressive Disclosure

No bundle files exist and none are needed; the ~77-line body is appropriately self-contained with well-organized sections (Finding the Project, Build Command, Interpreting Results, Common Build Failures), and the compact failure table is rightly inline rather than split out, satisfying the simple-skill guidance.

Specificity

"Build a native macOS app using xcodebuild from the command line" plus "fix build errors, verify changes compile, or run a debug build" names multiple concrete actions with comprehensive coverage of the build domain; no minor gaps warranting a 4, and the voice is third person with a standard 'Use when...' trigger clause rather than penalizable second person.

Completeness

Explicitly answers both 'what' (build a native macOS app using xcodebuild from the command line) and 'when' ("Use this skill whenever the user asks to build, compile, or check if their macOS project compiles successfully... Trigger on phrases like...") with concrete trigger phrases, matching the anchor-5 example structure.

Trigger Term Quality

Good natural phrases ("build the app", "does it compile", "fix build errors", "run xcodebuild") but coverage is missing common synonyms and extensions users would say, such as "Xcode", ".xcodeproj", or "build the project"; a 5 requires that comprehensive synonym/extension coverage.

Distinctiveness Conflict Risk

The macOS/Xcode CLI-build niche is mostly distinct, but the trigger "or even just 'build'" is over-broad and could fire for closely related build skills (iOS builds, other toolchains), fitting 'minor overlap risk with closely related skills' rather than the minimal-conflict anchor 5.