The body is lean and does not explain concepts Claude already knows (e.g., what Go is), instead assuming competence and pointing outward; every line is navigation or trigger context. Not a 2 because there is no unnecessary explanation or padding to tighten.

The only actionable instruction is "Read [GOLANG-RULES.md] for all Go-specific rules," and that referenced file does not exist in the bundle, so the body provides no concrete, executable guidance. Not a 2 because there is no usable concrete detail or example present in the body itself — the single pointer is broken.

Quick Start lists a numbered sequence (read rules → follow them → respect severity → follow idiomatic patterns), so a sequence exists, but there are no validation or verification checkpoints for a coding/reviewing task. Not a 3 because checkpoints are missing; not a 1 because the steps are explicitly sequenced rather than unclear.

Sections are organized and the GOLANG-RULES.md reference is one-level-deep and clearly signaled as a markdown link, but the referenced file is absent (dangling reference) and the "Rule Categories Overview" section ends mid-sentence ("...in these categories:") with no categories listed. Not a 3 because navigation is not genuinely effective; not a 1 because the structure is reasonable and references are signaled rather than monolithic or deeply nested.

Names several concrete actions ("Write, test, and maintain Go code") alongside specific guidance areas ("idiomatic patterns, standard library conventions, and Go best practices"), matching the anchor for multiple specific concrete actions; not a 2 because the actions are explicit and varied rather than a single broad claim.

Clearly answers both what ("Write, test, and maintain Go code...") and when with an explicit "Use when..." trigger clause; not a 2 because the when-guidance is explicit rather than only implied.

Covers natural terms users would say — "Go/Golang projects, writing Go code, or reviewing Go implementations" — including the common "Golang" variant; not a 2 because it provides good coverage rather than only some relevant keywords.

A clear Go-specific niche with distinct triggers ("Go/Golang projects"), unlikely to fire for the wrong skill; not a 2 because the domain and triggers are sharply scoped rather than broadly overlapping.