Conciseness

The body is dense with tables, a decision tree, and terse rules, with no padding or explanations of concepts Claude already knows (Parquet gets only a six-word "columnar format" gloss, which is justified). Minor redundancy — "index first" and the Polars >100MB rule each appear in multiple sections — keeps it at anchor 4 rather than anchor 5's "every token earns its place".

Actionability

Concrete commands and flags throughout (`qsv stats --cardinality --stats-jsonl`, `slice --len N`, `frequency --limit N`, `--output file.csv`, "sqlp with ORDER BY LIMIT instead of sort") with explicit thresholds ("> 100MB", "> 10MB"). It falls short of anchor 5's copy-paste-ready full invocations — no complete command line with an input file is shown — so anchor 4 ("mostly executable; concrete commands with minor gaps") fits.

Workflow Clarity

The "Large File Decision Tree" provides a clearly sequenced, size-gated workflow, and each accelerator carries an explicit ordering rule ("Always run `index` first if you'll run 2+ commands"; "Run stats ... before using any smart command"). No validation checkpoints are present, but none are required for read/analysis operations — the destructive/batch cap does not apply — and the missing feedback loops keep it below anchor 5.

Progressive Disclosure

The body is well-sectioned (accelerators → memory classes → decision tree → tips → concurrency → timeouts) with no buried or nested references; it references no external files and the bundle contains none. Good structure with no navigation issues matches anchor 4; the under-50-line exception that would allow a 5 does not apply to this ~110-line body.

Specificity

The description names the domain (qsv) and three concrete accelerator components ("index files, stats cache, and frequency cache"), but contains no actions — it says what the guide covers, not what the skill does. Anchor 3 (names domain with limited concrete content) fits better than 4, which expects several specific actions.

Completeness

A clear 'what' is present ("Performance guide covering index files, stats cache, and frequency cache accelerators"), but there is no 'when' — no 'Use when...' clause or any trigger guidance, which caps completeness at 3 per the judging guidelines.

Trigger Term Quality

Contains some relevant keywords ("performance", "index files", "qsv") but misses the natural phrases a user would actually say when needing this skill, such as "slow", "large CSV", or "speed up". Keyword coverage is present but missing common variations, matching anchor 3 rather than 4.

Distinctiveness Conflict Risk

"for qsv" gives it a clear niche with minimal conflict risk against non-qsv skills, but as a bare performance guide with no distinct triggers it has minor overlap risk with a general qsv skill — the "mostly distinct; minor overlap risk" of anchor 4 rather than anchor 5's distinct triggers.