The body is table- and code-driven with minimal prose (e.g., "J-Expr is a JSON-based expression syntax for HashQL. It represents typed expressions using JSON primitives.") and never explains concepts Claude already knows; every token earns its place.

Every construct ships concrete, copy-paste-ready jsonc examples — e.g. ["add", {"#literal": 1}, {"#literal": 2}], struct/list/tuple/dict forms, and let/fn/if patterns — with no pseudocode.

As a single-purpose composition skill (write J-Expr), the Do/Don't lists, Common Patterns, and Examples give an unambiguous mental model for assembling queries; no destructive/batch operations require validation checkpoints.

A compact overview points to four clearly signaled, one-level-deep references (syntax-reference.md, special-forms.md, data-constructors.md, type-dsl.md), all of which exist under ./references/, with content appropriately split for navigation.

Lists multiple concrete actions — "writing J-Expr code", "using #literal/#struct/#list constructs", "understanding function call syntax", and "working with HashQL query files (.jsonc)" — matching the multiple-specific-actions anchor.

Explicitly answers what ("HashQL J-Expr syntax for writing queries") and when (an explicit "Use when..." clause enumerating scenarios), satisfying the both-what-and-when anchor.

The "Use when" clause surfaces natural terms a user would say ("J-Expr code", "HashQL query files", ".jsonc", named #literal/#struct/#list constructs) with good coverage of variations.

A narrow niche (HashQL J-Expr, a JSON-based query syntax) with distinctive triggers (#literal/#struct/#list, .jsonc) makes conflict with other skills unlikely.