The body is lean and operational — terse bullet checklists, arrow-shorthand decision rules ('简单特征值（状态、等级、颜色） -> 属性') and exact field/enum contracts — with no padding explaining concepts Claude already knows; every line earns its place, matching the 'lean and efficient' anchor rather than the 'mostly efficient but could be tightened' level below.

Concrete and executable guidance: exact field names (network.id, keys.primary_keys[], pre_conditions), exact enum values (add/modify/delete/query), the ID regex [a-z0-9_-], and complete output templates (JSON skeleton + markdown recap). It is an instruction-only process skill where code absence is not penalized per the scoring notes, and the field contracts are copy-paste ready; it is not at 2 because key details are complete rather than missing.

A clear 7-phase sequence with labeled phases, documented import/from_doc entry points, and explicit validation checkpoints — Phase 7 完整性审查, 质量门禁（每轮） self-check with a fix-then-reoutput feedback loop ('如果任一失败，先修正再输出'), and 结束标准 completion criteria — matching the 'clear sequence with explicit validation steps and feedback loops' anchor; it is not capped at 2 because feedback loops for the structural/batch modeling operation are present.

The single SKILL.md is well-organized with clear navigable sections, but ~200 lines of content that could stand as separate references — the 与 bkn-creator 对接契约, 输出模板, and detailed quality gates — are kept inline with no one-level-deep reference files; this matches the 'some structure but content that should be separate is inline' anchor rather than the monolithic/nested level 1 or the well-signaled-reference level 3.

Lists multiple concrete outputs — '对象类型、关系类型、操作类型、风险类型与概念分组定义' — plus concrete actions like extracting drafts and extending existing BKN, matching the 'lists multiple specific concrete actions' anchor rather than the vague 'names domain and some actions' level below.

Explicitly answers both what ('指导BKN建模，输出符合 BKN 2.0.0 的...定义') and when ('适用于用户提出...的场景'), an explicit 'Use when' equivalent trigger clause, so it reaches the 'clearly answers both what AND when' anchor rather than capping at 2.

Natural domain keywords a user would actually say are well covered — '本体设计、知识网络建模、实体关系梳理、Action 设计、Schema 评审、从文档提取初稿或扩展现有 BKN' — matching the 'good coverage of natural terms' anchor; it is not at 2 because it goes beyond a single keyword to several common variations.

The pinned 'BKN 2.0.0' niche and ontology-modeling trigger list make it a clear niche unlikely to trigger for unrelated skills, matching the 'clear niche with distinct triggers' anchor; it is not at 2 because the domain is sharply scoped rather than merely 'somewhat specific'.