Conciseness

The prose is lean and assumes Claude's competence (no explanation of what Docker is), but the ~400-line body could be tightened: the Optimize-mode example Dockerfile largely duplicates the Python template, and three full mock reports (Review, Optimize, Scan outputs) consume tokens beyond what is needed to convey the format. Not 4 because the duplication and mock-report padding are more than 'minor instances'; not 2 because there is no conceptual over-explanation and every section is operational.

Actionability

Fully executable guidance throughout: concrete rule IDs with severities (SEC001-OPT006, MNT001-004), copy-paste-ready scanner commands ('trivy image --severity HIGH,CRITICAL {{image}}', 'grype {{image}} --only-fixed'), complete Dockerfile templates per language with explicit placeholders, and concrete output file paths. Covers the common cases (Python, Node, Go, .NET).

Workflow Clarity

Each mode has a clear numbered procedure (locate → analyze → report; interview → generate → review), plus checkpoints like tool detection at skill start, 'Review the generated files with user', and guardrails in Forbidden Behaviors. Not 5 because there is no explicit validate→fix→retry loop (e.g., re-running the review rules or hadolint on the optimized Dockerfile to confirm all findings are resolved); not 3 because checkpoints are mostly present and operations are guarded rather than missing.

Progressive Disclosure

The body is well-sectioned with clear headers per mode, but it is a monolithic ~400-line file: the four full language templates and the three rule catalogs are inline content that clearly belongs in separate reference files (e.g., templates.md, rules.md), and no references exist at all. Fits anchor 3 ('content that should be separate is inline'); not 4 because nothing is offloaded to a referenced file, and not 2 because internal structure and navigation within the file are good.

Specificity

Names the domain (Docker images/Dockerfiles) and several concrete actions ('reviews, optimization, and step-building guidance. Analyzes Dockerfiles for best practices, security issues, and anti-patterns'), with only minor coverage gaps such as security scanning of built images. Not 5 because it does not enumerate the full set of capabilities (e.g., interactive building, scanning), and not 3 because it lists more than 1-2 concrete actions.

Completeness

Has a clear 'what' (analyzes Dockerfiles for best practices, security, anti-patterns) but no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines. The 'when' is entirely absent rather than weakly implied, so it cannot score 4.

Trigger Term Quality

Good natural keyword coverage: 'Docker image', 'Dockerfiles', 'reviews', 'optimization', 'security issues' — terms a user would naturally say. Not 5 because common synonyms like 'container', 'image scanning', or vulnerability-related phrasing are missing; not 3 because the terms present go beyond minimal domain naming.

Distinctiveness Conflict Risk

The Docker/Dockerfile niche is clearly distinct with dedicated triggers ('Dockerfiles', 'Docker image'), with only minor overlap risk against generic linting or CI skills. Not 5 because 'best practices' and 'optimization' are broad phrases that could collide with general code-review skills.