Mostly efficient with a compact Quick Reference table and terse Common Mistakes rows, but it opens by explaining concepts Claude already knows ('Go favors short, readable names. Capitalization controls visibility — uppercase is exported') and the Quick Reference table overlaps substantially with the later Common Mistakes table.

Concrete, executable Go examples appear throughout (✓ Good / ✗ Bad identifier blocks, receiver forms, error strings) and the Common Mistakes table pairs each mistake with a specific fix, matching the 'fully executable, copy-paste ready' anchor.

Identifying and renaming identifiers is a risky operation, yet the body delegates the safe-rename validation workflow to another skill ('→ See golang-gopls skill to do it safely') rather than inlining validation checkpoints, so workflow clarity is capped at 2.

A concise overview in SKILL.md points one level deep to five clearly-signaled, verified reference files (packages-files.md, identifiers.md, functions-methods.md, types-errors.md, testing.md) with well-described navigation links.

Lists many concrete categories and actions — 'covers packages, constructors, structs, interfaces, constants, enums, errors, booleans, receivers, getters/setters, functional options, acronyms, test functions, and subtest names' — matching the 'multiple specific concrete actions' anchor.

Explicitly answers both what (the naming conventions covered) and when via explicit 'Use this skill when...', 'Also trigger when...', and 'Do NOT use for...' triggers.

Natural terms users would say are well covered: 'writing new Go code, reviewing or refactoring', 'MixedCaps vs snake_case', 'ALL_CAPS constants', 'Get-prefix on getters', 'error string casing', 'Go naming best practices'.

Clear niche (Go naming) with an explicit negative trigger ('Do NOT use for general Go implementation questions that don't involve naming decisions') that prevents conflicts with broader Go skills.