Conciseness

Lean and efficient: terse tables, bullet points, and pointers to executable example files rather than inlined code, assuming Claude's competence with every token earning its place.

Actionability

References concrete, executable example files (root.go, flags.go, config.go, etc.) and names specific APIs (MarkFlagRequired, signal.NotifyContext, cmd.OutOrStdout()) plus a concrete validator table and config precedence ordering.

Workflow Clarity

Sequences Build/Extend/Review modes with the Review mode providing an explicit audit checklist (Common Mistakes table, verify SilenceUsage/SilenceErrors, flag-to-Viper binding, exit codes, stdout/stderr discipline); no destructive/batch validation loops are needed for this reference-style skill.

Progressive Disclosure

Clear overview in SKILL.md with well-signaled one-level-deep references to real files in assets/examples/ (all referenced paths verified to exist), with content appropriately split and easy to navigate.

Specificity

Lists multiple specific concrete actions (command structure, flag handling, configuration layering, version embedding, exit codes, I/O patterns, signal handling, shell completion, argument validation, CLI unit testing), giving comprehensive coverage of the domain.

Completeness

Explicitly answers both 'what' (Golang CLI application development) and 'when' ('Use when building, modifying, or reviewing a Go CLI tool', 'Also triggers when code uses cobra, viper, or urfave/cli') with concrete trigger phrases.

Trigger Term Quality

Strong natural trigger phrases ('building, modifying, or reviewing a Go CLI tool', 'cobra, viper, or urfave/cli') that a user would naturally say, with good synonym coverage of the Go CLI ecosystem.

Distinctiveness Conflict Risk

Clear niche (Go CLI tooling) with distinct triggers, and proactively defers cobra/viper-specific APIs to sibling skills, minimizing overlap and conflict risk.