Conciseness

The body is mostly efficient and does not explain basic concepts Claude already knows, but the core 'do not invent improvements, get a concrete issue first' message is restated across the Overview, 'The Core Problem', the 8-row 'Stop If You Catch Yourself' table, and Step 1, which is redundancy that could be tightened. Not a 1 because it is not padded with generic background Claude knows; not a 3 because the repeated anti-invention emphasis across four sections does not earn every token.

Actionability

Provides concrete, actionable guidance for an instruction-only skill: before/after phrasings ('NEVER use ellipses' → 'Never use ellipses because…'), explicit valid/invalid 'concrete issue' examples, and a copy-pasteable Issue→Fix table ('Change "Can you…" to imperative "Do X"'). Not a 2 because the guidance is specific and immediately usable rather than abstract or pseudocode-level.

Workflow Clarity

The 'Required Process' is a clearly sequenced four-step workflow with an explicit gating checkpoint in Step 1 ('Do NOT proceed with generic improvements based on assumptions') and a self-correction checklist (the 'Stop If You Catch Yourself' table). Not a 2 because checkpoints are explicit, not merely implicit; this skill does not involve destructive/batch operations, so the missing-feedback-loop cap does not apply.

Progressive Disclosure

SKILL.md serves as the overview while the full guidance is delegated one level deep to a clearly signaled, verified-real file ('See references/anthropic-best-practices.md for the full reference'), with content appropriately split. Not a 2 because the reference is well-signaled and exactly one level deep with no nested indirection.

Specificity

Lists multiple concrete actions — 'diagnose the concrete failure first, then apply current documented Anthropic best practices' — plus an enumerated category list (explicit instructions, context/motivation, examples, output and verbosity control, thinking/effort), matching the 'lists multiple specific concrete actions' anchor. Not a 2 because it goes beyond naming a domain and a few actions into a comprehensive, specific action set.

Completeness

Explicitly answers both what ('optimizing CLAUDE.md, AGENTS.md, custom commands, or skill files — diagnose the concrete failure first, then apply current documented Anthropic best practices') and when ('Use when optimizing…', 'Triggers when a prompt isn't followed…'). Not a 2 because the 'when' is stated with explicit triggers, not merely implied.

Trigger Term Quality

Includes natural phrases users would actually say — 'a prompt isn't followed', 'a skill won't activate', 'CLAUDE.md is too long or ignored', 'migrating prompts to current Claude models' — giving good coverage of common variations. Not a 2 because it covers multiple natural trigger phrasings rather than a single generic keyword.

Distinctiveness Conflict Risk

Occupies a clear niche — diagnosing a concrete failure then applying documented Anthropic practices rather than inventing improvements — with distinct triggers unlikely to fire for unrelated skills. Not a 2 because the framing (concrete-failure-first, documented practices only) sharply distinguishes it from generic 'improve my prompt' skills.