The body is mostly efficient and project-specific (file tree, sidebar filenames, translation rules) without explaining concepts Claude already knows, but the "When to Use This Skill" list substantially duplicates the frontmatter description and the Step 1 mapping table partly overlaps the Documentation Map. This matches the score-2 anchor of mostly efficient but could be tightened, rather than a 3 where every token earns its place.

It gives copy-paste-ready commands ("cat docs/en/guide/cli-reference.md", the "diff <(find docs/en -name '*.md' ...)" tree check, "npm run docs:build"), exact file paths, a change-type→file mapping table, and specific translation rules (keep code identical, point Chinese links to "/zh/..."). This matches the score-3 anchor of fully executable commands with specific examples, and is not a 2 because the guidance is concrete rather than pseudocode or abstract.

Five clearly sequenced steps (Identify Impact Scope → Read Current Docs → Update English → Sync Chinese → Validate) lead to an explicit validation checkpoint in Step 5 with concrete checks, and the Common Pitfalls section acts as a checklist. Because validation is present, the batch-operation cap at 2 does not apply, reaching the score-3 anchor of a clear sequence with explicit validation steps and a feedback loop via docs:build.

No bundle files exist (references/scripts/assets absent), and the ~155-line SKILL.md is a single well-sectioned document (Overview, When to Use, Documentation Map, Workflow, Translation Guidelines, Common Pitfalls) with no deeply nested references. For a procedural skill that needs no external reference files, this matches the score-3 anchor of clear, well-signaled organization with easy navigation, not a 2 where content that should be separate is inline.

"Synchronize bilingual documentation" is a concrete action, and the description enumerates multiple specific change types ("CLI commands/options, environment variables, configuration formats, public APIs/extension points, workflows, installation requirements, migration guidance"), matching the score-3 anchor of listing several specific concrete actions. It is not a 2 because it goes well beyond naming a domain plus a few actions, and 3 is the scale maximum.

It answers "what" ("Synchronize bilingual documentation when StaticPHP v3... documentation must change") and "when" with an explicit "Use when..." trigger clause plus negative guidance ("Do not use solely for..."). Because the Use-when clause is present, completeness is not capped at 2, so it reaches the score-3 anchor of clearly answering both what and when with explicit triggers.

The "Use when adding, modifying, deprecating, or removing documented features, CLI commands/options, environment variables... migration guidance, or user-visible behavior" clause covers natural phrasings a developer would actually say when requesting doc updates. It is not a 2 because it includes common variations rather than only a few relevant keywords, and 3 is the cap.

The niche is tightly scoped to "StaticPHP v3" bilingual (en/zh) documentation sync, with triggers tied to that project's documented surfaces, making it unlikely to fire for unrelated skills. It is not a 2 because the scoping is far more specific than "works with document files," and 3 is the maximum.