The body is lean and assumes Claude's competence — a dense algorithm comparison table, terse Common Mistakes/Best Practices, and a worked capacity example with no padded explanations of what caching or libraries are, matching the 'lean and efficient; every token earns its place' anchor rather than the mostly-efficient-but-tightenable 2.

Provides fully executable, copy-paste-ready Go builder chains (e.g. hot.NewHotCache[string, *User](hot.WTinyLFU, 10_000).WithTTL(...).Build()), named constants, a concrete 'go get' command, and a numeric capacity worked example, satisfying the 'fully executable code/commands; copy-paste ready' anchor.

The Capacity Sizing section is a clear numbered sequence (estimate item size, ask for memory budget, compute capacity) with an explicit measurement/validation checkpoint ('If the item size is unknown... measure it with a unit test... Guessing capacity without measuring leads to OOM'), and Common Mistakes supplies error-recovery context; this meets the clear-sequence-with-explicit-validation anchor and benefits from the simple-skill guidance.

The body is an overview that cleanly points to three real, one-level-deep reference files (algorithm-guide.md, production-patterns.md, api-reference.md — all verified present in ./references/) with well-signaled links, plus sibling-skill cross-references, matching the 'clear overview with well-signaled one-level-deep references' anchor.

Lists many concrete capabilities — nine named eviction algorithms (LRU, LFU, TinyLFU, W-TinyLFU, S3FIFO, ARC, TwoQueue, SIEVE, FIFO), TTL, cache loaders, sharding, stale-while-revalidate, missing key caching, and Prometheus metrics — matching the 'lists multiple specific concrete actions' anchor rather than the partial coverage of a 2.

Explicitly answers both 'what' (the caching capabilities enumerated) and 'when' via an explicit 'Apply when using or adopting samber/hot, when the codebase imports github.com/samber/hot, or when the project repeatedly loads...' clause, satisfying the both-what-and-when-with-explicit-triggers anchor.

Includes natural terms a developer would actually say — 'In-memory caching in Golang', 'samber/hot', 'github.com/samber/hot', 'latency', 'backend pressure' — plus concrete import-path and adoption triggers, giving good coverage rather than the jargon-only or partial-variation anchors below.

Tightly bound to the specific samber/hot library with a distinct import-path trigger, giving a clear niche that is unlikely to fire for unrelated caching skills; not the generic or merely-somewhat-specific anchors at 1-2.