cobra-patterns

Cobra enables nested command hierarchies through parent-child command relationships, similar to kubectl. Define parent commands, attach subcommands via AddCommand(), and configure local flags per command level. This pattern scales maintainable CLI tools with clear command organization and inheritance of persistent flags across the hierarchy.

Local flags apply to a single command; persistent flags inherit to all subcommands. Use cmd.Flags() for local flags and cmd.PersistentFlags() for inherited ones. Bind values with BindFlag() and validate early in PreRun hooks. This separation prevents flag collision and enforces consistent behavior across nested command structures.

Cobra provides PreRun, Run, and PostRun hooks for setup, execution, and cleanup. Use RunE instead of Run to return errors directly; combine with proper exit codes for CLI integration. PreRun validates arguments and state; PostRun handles resource cleanup. This pattern ensures robust, maintainable error propagation and lifecycle control.

Yes. Cobra supports kubectl-style nested structures with command hierarchies, flag inheritance, and argument validation in PreRun hooks. Ready-to-use templates and scaffold scripts in this Skill accelerate setup. Combine with RunE error handling and structured initialization patterns for production-ready, maintainable command-line tools.

Initialize Cobra CLIs with structured scaffolding: define root commands, attach subcommands hierarchically, bind flags early, and validate in PreRun hooks. Setup scripts automate project structure; example commands demonstrate patterns. This layered approach decouples command logic from flag management and lifecycle concerns.

Familiarity with Go and basic command-line concepts helps, but this Skill provides templates and examples for common patterns. Understanding flag types, command nesting, and lifecycle hooks accelerates adoption. Templates reduce boilerplate, allowing focus on business logic rather than CLI scaffolding.