Conciseness

The body is dense and product-specific throughout — it explains nothing Claude already knows — but several passages enumerate every failure mode and policy nuance inline where a general rule plus the already-cited doc would do: "A missing local Ollama service, malformed HTTP reply, missing selected model, unusable vector, or any candidate embedding failure falls back...", the incremental-prefixing paragraph, and the untagged-model ":latest" alias rules. This fits anchor 4 (efficient with minor over-explanation that could be trimmed) better than 5, since not every token earns its place.

Actionability

Every operational section gives copy-paste-ready bash: product-root resolution with `test -f` verification, provision commands (`--peek` preview, prefix, build, smoke-test retrieve), read-only query, diagnostics (`stats`, `query`, `--peek`), and the bench invocation. Only `$VAULT`/`$QUERY` placeholders remain, which is standard and expected; common cases are covered.

Workflow Clarity

A clear sequence runs preview → prefix → build index → smoke-test retrieve → query, with explicit validation checkpoints (`test -f`, `--peek`, `--explain`, hash-match gates), an explicit error-recovery loop (exit 10 with a stable rebuild command; deterministic fallback to BM25 order), integrity rules, and a final checklist section. The destructive/batch cap of 3 does not apply: cache writes carry hash validation, fail closed under the vault-wide lock, and never touch canonical notes.

Progressive Disclosure

Sections are clear and the two references ([prefix providers](../../docs/prefix-providers.md), [offline retrieval evaluation](../../docs/retrieval-evaluation.md)) are well-signaled and one level deep. However, the bundle contains only SKILL.md, and the body carries substantial policy detail inline (privacy/egress rules, model selection, tag aliasing, truncation limits) beyond a lean overview even though the linked doc is cited for "the exact policy" — a minor organization gap that fits anchor 4 rather than 5.

Specificity

"Build and query a vault-local contextual BM25 retrieval index with optional multilingual Nomic cosine reranking" plus "retrieval diagnostics" lists multiple concrete actions (build, query, rerank, diagnose) covering the skill's whole surface. It exceeds the 4 anchor because there are no minor coverage gaps — build, query, rerank, and diagnostics span the skill's complete capability set.

Completeness

It explicitly answers "what" ("Build and query a vault-local contextual BM25 retrieval index with optional multilingual Nomic cosine reranking") and "when" ("use for ... or retrieval diagnostics") with concrete trigger phrases. The cap of 3 for a missing "Use when" clause does not apply; this matches the anchor-5 example pattern of capability statement plus explicit trigger list.

Trigger Term Quality

The "use for retrieve, hybrid retrieval, BM25, rerank, contextual retrieval, chunk search, vault search, semantic search, find relevant passages, or retrieval diagnostics" clause gives comprehensive coverage mixing natural user phrases ("vault search", "find relevant passages", "semantic search", "chunk search") with technical synonyms ("BM25", "contextual retrieval", "hybrid retrieval"). It is not score 4 because no common variation for this domain is obviously missing; file extensions do not apply to a vault-retrieval niche.

Distinctiveness Conflict Risk

"vault-local contextual BM25 retrieval index" pins a clear niche with retrieval-specific triggers, minimal conflict with generic skills. The single bare term "retrieve" is slightly generic, but anchored to the vault-retrieval context it does not create realistic overlap; it fits the clear-niche anchor better than the 4 anchor's "minor overlap risk with closely related skills".