Conciseness

The body is lean and telegraphic ("Primary data to stdout; diagnostics/errors to stderr"), assuming Claude's competence with no concept explanations. However, the same flags and conventions (--json/--plain, --no-input, dry-run/confirmation, quiet/verbose) recur across "Clarify", "Deliverables", "Default Conventions", and the Template, which could be consolidated. Not 5 due to this cross-section repetition; not 3 because there is no padding or explanation of known concepts.

Actionability

For an instruction-only design skill, the guidance is fully actionable: a concrete clarifying-question list, a deliverables checklist ("Command tree + USAGE synopsis", "Error + exit code map", "5-10 example invocations"), and a copy-paste-ready spec skeleton with concrete defaults (exit codes 0/1/2, precedence "flags > env > project config > user config > system", NO_COLOR/TERM=dumb handling). Per the scoring notes, absence of code is not penalized when guidance is this specific.

Workflow Clarity

The sequence is explicit and ordered: "Do This First" (read references/cli-guidelines.md, ask minimum questions) -> "Clarify (fast)" with a fallback checkpoint ("Ask, then proceed with best-guess defaults if user is unsure") -> "Deliverables" -> template. Not 5 because there is no validation step for the produced spec (e.g., cross-check the final spec against the guidelines file before delivering). Not 3 because the sequence is explicit rather than implicit and a clarify-with-fallback checkpoint exists; the destructive/batch validation cap does not apply to this design skill.

Progressive Disclosure

The body is a concise overview with a single, clearly signaled, one-level-deep reference ("Read `references/cli-guidelines.md` from this skill directory and apply it as the default rubric") that verifiably exists in the bundle; the bulk guideline detail lives in that 239-line file. Structure is easy to navigate with distinct sections for clarify/deliver/conventions/template. Not 4 because no content that belongs in the reference is inlined at problematic scale.

Specificity

The description enumerates ten-plus concrete capability areas ("arguments, flags, subcommands, help text, output formats, error messages, exit codes, prompts, config/env precedence, and safe/dry-run behavior"), which matches the comprehensive anchor 5, but "Use when you're designing a CLI spec" uses second-person voice, which the judging guidelines penalize by one point. Not anchor 3 because far more than 1-2 actions are named; not 5 due to the voice penalty.

Completeness

Clearly answers both questions: the 'what' is explicit ("Design command-line interface parameters and UX: arguments, flags, ... safe/dry-run behavior") and the 'when' is explicit with concrete triggers ("Use when you're designing a CLI spec (before implementation) or refactoring an existing CLI's surface area"). Matches the anchor-5 example pattern of concrete what followed by 'Use when...' phrasing.

Trigger Term Quality

Comprehensive natural-term coverage with synonyms present: "command-line interface" and "CLI" both appear, alongside "arguments", "flags", "exit codes", "CLI spec", and "refactoring an existing CLI". Users designing or refactoring command-line tools would naturally say these terms. Not 4 because both synonym forms and the component vocabulary users actually invoke are covered.

Distinctiveness Conflict Risk

Clear niche (CLI surface/UX design) with distinct triggers, and the "(before implementation)" qualifier explicitly separates it from CLI implementation/coding skills. Minor theoretical overlap with general design skills, but the trigger phrasing targets exactly the spec-design case. Not 4 because the before-implementation boundary plus CLI-specific vocabulary make conflict risk minimal.