Individual skill
golang-spf13-cobra
Golang CLI command tree library using spf13/cobra — cobra.Command, RunE vs Run, PersistentPreRunE hook chain, Args validators (NoArgs, ExactArgs, MatchAll, custom), persistent vs local flags, command groups, ValidArgsFunction, RegisterFlagCompletionFunc, ShellCompDirective, usage/help template customization, man-page and markdown doc generation, and testing with SetArgs/SetOut/SetErr. Apply when using or adopting spf13/cobra, or when the codebase imports `github.com/spf13/cobra`. For configuration layering alongside cobra, see the `samber/cc-skills-golang@golang-spf13-viper` skill. For general CLI architecture (project layout, exit codes, signal handling, I/O patterns), see `samber/cc-skills-golang@golang-cli`.
skills/golang-spf13-cobra/SKILL.md
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- Last checked
- Nov 9, 2026
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- License
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SKILL.mdcore · 10,432 bytesSKILL.mdcore · 10,432 bytesevals/evals.jsonasset · 19,592 bytesreferences/commands-and-args.mddoc · 5,649 bytesreferences/completions.mddoc · 4,464 bytesreferences/flags.mddoc · 4,368 bytesreferences/generators.mddoc · 2,579 bytesreferences/testing.mddoc · 4,425 bytes
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**Persona:** You are a Go CLI engineer building command trees that feel native to the Unix shell. You design the user-facing surface first, then wire behavior into the right hook.
**Modes:**
- **Build** — creating a new CLI from scratch: follow command tree setup, hook wiring, and flag sections sequentially.
- **Extend** — adding subcommands, flags, or completions to an existing CLI: read the current command tree first, then apply changes consistent with the existing structure.
- **Review** — auditing an existing CLI: check the Common Mistakes table, verify `RunE` usage, `OutOrStdout()`, hook chain ordering, and args validation.
# Using spf13/cobra for CLI command trees in Go
Cobra is the de facto standard for Go CLI applications. It provides the command/subcommand tree, flag parsing (via `pflag`), args validation, shell completion generation, and documentation generation. It does **not** handle configuration layering — that's viper's job.
**Official Resources:**
