Conciseness

The body is lean and imperative throughout — no concept explanations Claude already knows, no padding, and every line carries instruction or a concrete command (e.g., "削除対象を推測しません。", "ウェルカム表示は成功後だけです。"). It matches the 'every token earns its place' anchor.

Actionability

Fully executable, copy-paste-ready commands with explicit flags and JSON output: `claude plugin list --json`, `node "$CLAUDE_PLUGIN_ROOT/scripts/setup.js" --mode claude-plugin --scope <scope> --hooks <hooks> [--move-scope] --dry-run --json`, npx fallbacks, and a complete `node -e` welcome-rendering invocation. Placeholders are explicit and clearly parameterized, covering the common cases per harness.

Workflow Clarity

A clearly sequenced 5-step wizard (inventory → collect choices → preview/confirm once → apply → verify then welcome) with explicit validation checkpoints (exit code 0, setup result scope/hooks matching selections, exactly one enabled `ecc@ecc`) plus stop-on-error guidance and recovery paths — matching the explicit-validation and feedback-loop anchor. The destructive-operation cap does not apply since validation is present.

Progressive Disclosure

Sections are well organized with clear per-harness navigation (## Claude Code / ## Codex / ## Kimi) and the body stays a reasonable size. However, at ~185 lines with all three harness procedures fully inlined and no bundle reference files, it sits between the 'good structure with minor gaps' anchor and the ideal split — per-harness procedures could live in one-level-deep reference files.

Specificity

The description names the domain (ECC configuration within Claude Code, Codex, and Kimi) and several concrete actions ("インストール、更新、再設定" — install, update, reconfigure) plus the constraint to respect each harness's actual plugin/scope/hook capabilities. It falls short of a 5 because coverage is not comprehensive — verification, scope selection, and welcome rendering are handled by the skill but not reflected here.

Completeness

The "what" is clearly stated (guides install/update/reconfigure of ECC across three harnesses while respecting actual harness capabilities), but there is no "Use when..." clause or equivalent explicit trigger guidance, which per the judging guidelines caps completeness at 3. It is not a 4 because the "when" is entirely absent rather than merely implicit or loosely worded.

Trigger Term Quality

Good natural keyword coverage: "ECC", "インストール", "更新", "再設定", "Claude Code", "Codex", "Kimi", "プラグイン", "スコープ", "フック" — terms a user needing this skill would plausibly say. A few common variations are missing (e.g., "セットアップ"/"setup", "設定"), so it does not reach the comprehensive synonym coverage of a 5.

Distinctiveness Conflict Risk

The description occupies a clear niche — ECC configuration across three explicitly named harnesses (Claude Code, Codex, Kimi) — with distinct trigger terms and minimal risk of firing for an unrelated skill.