Conciseness

The core workflow is efficient and project-specific, but there is real padding: the full ~70-line .dockerignore template is inlined in Stage 4 even though assets/example.dockerignore already exists, and the 'Quick Security Checklist', 'Quick Optimization Checklist', 'Always Include', and 'Notes' sections largely restate the Stage 3 Core Principles verbatim. Fits the 3 anchor ('mostly efficient but includes some unnecessary... could be tightened'); it is not the 2 anchor because the padding is redundant repetition of genuine guidance rather than explanations of concepts Claude already knows, and not the 4 anchor because roughly a fifth of the body is duplicate content that should be trimmed.

Actionability

Fully executable guidance throughout: exact MCP tool names ('mcp__context7__resolve-library-id', 'mcp__context7__get-library-docs' with parameters), a concrete search-query pattern, the required syntax directive '# syntax=docker/dockerfile:1', real hadolint codes with fixes ('Error: DL3006 - Missing version tag / Fix: Change FROM node:alpine to FROM node:20-alpine'), copy-paste bash usage commands, and BAD/GOOD anti-pattern pairs. Matches the 5 anchor (copy-paste ready, covers common cases).

Workflow Clarity

Seven clearly sequenced stages each with an Objective, an explicit validation checkpoint (Stage 5: 'REQUIRED: Always validate after generation' invoking devops-skills:dockerfile-validator), and a documented feedback loop (Stage 6: 'Iterate at least ONCE if validation finds errors... Repeat until clean OR maximum 3 iterations') with a worked iteration example and a dedicated Error Handling section. Matches the 5 anchor (explicit validation steps, error-recovery loops, checklists).

Progressive Disclosure

Good structure: all five references/ files cited are real, one level deep, and clearly signaled by topic ('Security: references/security_best_practices.md - Non-root users, minimal images, secrets management'), and scripts/ are listed with purpose and an explicit 'when using this skill' boundary. Falls short of the 5 anchor because the 7 files in assets/ (six example Dockerfiles and example.dockerignore) are never referenced from the body, and the inlined Stage 4 .dockerignore template duplicates — and drifts from — assets/example.dockerignore, i.e. content that belongs in a bundle file is inlined. Comfortably above the 3 anchor, whose references would be unclear or un-signaled.

Specificity

Lists multiple concrete actions with comprehensive coverage: 'multi-stage builds, layer caching, security hardening (non-root users, minimal base images), health checks, and automatic .dockerignore creation', plus 'Validates output using devops-skills:dockerfile-validator with iterative error fixing'. This matches the 5 anchor (multiple specific concrete actions) and exceeds the 4 anchor, which expects minor coverage gaps; no capability here is vague or generic.

Completeness

Explicitly answers both questions: 'what' via 'Generates production-ready Dockerfiles with...' and 'when' via a concrete 'Use when...' clause with trigger phrases and an 'Also applies when...' extension. Matches the 5 anchor exactly; not the 4 anchor, whose 'when' would be less explicit or specific.

Trigger Term Quality

Covers natural synonyms and phrasings users would actually say: 'create, generate, write, or build a Dockerfile or docker image, containerize an app, set up a container', language names (Node.js, Python, Go, Java), and quoted phrases like 'containerize my app', 'docker-compose setup', 'optimize my Docker build'. Matches the 5 anchor (comprehensive natural terms including synonyms); the 4 anchor would require a few natural terms to be missing, which is not the case.

Distinctiveness Conflict Risk

Dockerfile generation is a clear niche with distinct triggers, but there is minor overlap risk: the trigger 'docker-compose setup' invites invocation for compose work the skill does not perform, and the description names the sibling 'devops-skills:dockerfile-validator' without a generation-vs-validation boundary in the description itself. Fits the 4 anchor ('mostly distinct; minor overlap risk') rather than 5, which requires minimal conflict risk.