The body avoids explaining concepts Claude already knows and uses a compact table plus an ASCII diagram, but the Do's/Don'ts list contains generic truisms ("A/B test", "Tune weights empirically") that could be tightened.

The fusion-methods table and best-practices list give concrete direction, but the body itself contains no executable code or commands; all runnable templates are deferred one level deep to references/details.md.

The architecture diagram shows a clear query→vector+keyword→fusion→results sequence, but there is no explicit multi-step workflow with checkpoints or error-recovery guidance, leaving the sequence implicit.

The body is a concise overview with a single, clearly signaled one-level-deep reference ("Full template library and detailed worked examples live in references/details.md"), and the referenced file exists with no further nesting.

"Combine vector and keyword search for improved retrieval" names the domain and a concrete combined action, but it describes one fused capability rather than multiple distinct concrete actions as the level-3 anchor requires.

It clearly states what it does ("Combine vector and keyword search for improved retrieval") and gives an explicit "Use when..." trigger clause covering RAG systems, search engines, and insufficient recall.

"RAG systems" and "search engines" are natural terms users would say, but common variations like "hybrid search", "semantic search", or "BM25" are absent, so coverage is partial rather than complete.

The hybrid-search niche is specific, and the distinctive trigger "when neither approach alone provides sufficient recall" makes it unlikely to fire for a pure-vector or pure-keyword skill.