Conciseness

The body is lean and instruction-dense with zero padding: every line tells Claude something it could not infer ('run **one** targeted KB search', 'focused on terms the user would have written, not synonyms', 'never write a chunk id, URL, or title yourself'). It matches 'Lean and efficient; assumes Claude's competence; every token earns its place'.

Actionability

Guidance is largely concrete and executable — '2-4 specific, citation-worthy sub-questions', 'Open the most relevant 2-3 documents fully via `read_file`', 'Use `grep` to find supporting passages', and a precise citation rule. It falls short of anchor 5 because step 2 says 'run one targeted KB search' without naming the actual search tool or command, leaving the core operation underspecified.

Workflow Clarity

The four steps are clearly sequenced (decompose → search/read → grep → cite) and the 'Not found in your knowledge base' callout guards against fabrication. It is not level 5 because there is no explicit validation checkpoint (e.g., verifying each cited passage actually supports its claim before finalizing the answer); it sits at 'Clear sequence with most checkpoints present; minor validation gaps'.

Progressive Disclosure

The skill is under 50 lines with no need for external references, and it is organized into three well-labeled sections ('When to use this skill', 'Plan', 'What good output looks like'). Per the rubric's simple-skill guideline, this earns the top anchor without bundle files.

Specificity

The description names the domain ("the user's knowledge base") but the actions are generic — "finding and synthesizing information" could describe almost any search task, and "Structured approach" is filler. It matches the anchor 'Names the domain but actions are minimal or generic' rather than level 3, which requires 1-2 concrete actions (e.g., 'searches notes and documents and cites supporting passages').

Completeness

The 'what' is clear (finding and synthesizing information from the user's knowledge base), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps this dimension at 3 per the judging guidelines. Not level 2, because the 'what' is specific rather than vague.

Trigger Term Quality

"knowledge base" is a term users would naturally say, but common variations and synonyms ("search my notes", "look up in my docs", "KB", "what did we discuss") are absent. This is 'Some relevant keywords but missing common variations or synonyms' — not level 4, which expects good coverage across several natural phrases.

Distinctiveness Conflict Risk

Scoping to "the user's knowledge base" gives it a niche, but 'finding and synthesizing information' overlaps heavily with general research, search, and summarization skills. Anchor 3 ('Somewhat specific but could still overlap with similar skills') fits; level 4 would require more distinct trigger phrasing that separates it from generic research skills.