Conciseness

The body is dense and prescriptive, focusing on non-obvious knowledge (why `exit(N)` breaks coverage extraction, AOT `resolvedExecutable` self-invocation, Windows sigterm `UnsupportedError`) rather than basics Claude already knows. It is not 5 because of minor trimmable material, e.g., the 11-line Contents list that duplicates the section headers and a few explanatory asides.

Actionability

Multiple complete, executable Dart blocks (CommandRunner entrypoint, thin `bin/` trampoline, terse stack-trace handler, TestProcess integration test) plus concrete commands (`dart create -t console`, `dart install`, `dart compile exe bin/cli.dart -o <output_path>`) and a copy-paste pubspec `executables:` snippet cover the common cases. Not 4 because the examples are complete and runnable rather than having gaps.

Workflow Clarity

The Implementation Workflow provides an 8-item audit checklist and the testing section gives explicit validation (in-memory unit tests, subprocess exit-code verification via `test_process`). It is not 5 because the workflow is an unordered checklist rather than a sequenced build order with explicit feedback/recovery loops, and not 3 because validation checkpoints are explicitly stated.

Progressive Disclosure

Deep material is appropriately split into one-level-deep reference files that exist and are clearly signaled at the point of need (sections 6 and 7 link `references/aot_sdk_discovery.md` and `references/signals_and_terminal.md`), and the body sections are well organized. However, 2 of the 4 paths in the References & Examples section — `examples/single_command_tool.dart` and `examples/multi_command_runner.dart` — do not exist in the bundle, breaking navigation; this pushes it below the 'minor organization gaps' of 4.

Specificity

The description lists five concrete capability areas — "Architectural patterns, entrypoint structure, exit codes, stream routing, and subprocess spawning" — with no vague filler, matching the comprehensive-coverage anchor. It is not 4 because the coverage of the skill's scope is complete rather than having minor gaps.

Completeness

The first sentence explicitly answers 'what' (architectural patterns, entrypoint structure, exit codes, stream routing, subprocess spawning for Dart CLI applications) and the second gives a concrete "Use when building CLI tools..." trigger clause. It is not 4 because the 'when' is fully explicit with multiple concrete triggers rather than only somewhat specific.

Trigger Term Quality

It includes natural phrases users would say — "building CLI tools, console utilities, scripts, argument parsing with `package:args` (ArgParser or CommandRunner), handling exit codes, spawning Dart subprocesses, compiling native CLI binaries" — with synonyms (CLI / command-line interface / console) all present. It is not 4 because both common phrasings and library-specific terms are covered comprehensively.

Distinctiveness Conflict Risk

A clear niche (Dart CLI tooling) with a concrete negative boundary — "Don't use for Flutter UI widgets, web applications, or standalone HTTP backend servers" — minimizing overlap with adjacent skills. It is not 4 because the exclusions remove even the closely-related overlap risks.