Golang Spf13 Cobra

What it does

When your agent uses it

• Development work in your project

Example prompts

• “/golang-spf13-cobra”

Requirements

• Compatibility (from SKILL.md): Designed for Claude Code, Codex or similar harness, and for projects using Golang.
• Pre-approved tools (allowed-tools): Read, Edit, Write, Glob, Grep, Bash(go:*), Bash(golangci-lint:*), Bash(git:*), Agent, WebFetch, mcp__context7__resolve-library-id, mcp__context7__query-docs, Bash(godig:*), Bash(gopls:*), LSP, mcp__gopls__*

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Always use RunE, never Run — Run cannot return an error; the only escape is os.Exit or panic, bypassing defers.
2. 2Put config initialization in PersistentPreRunE — it runs before every subcommand; the right place for viper binding and auth checks.
3. 3Validate positional args with Args, not inside RunE — Args gives cobra's standard error messages; MatchAll composes validators.
4. 4Use cmd.OutOrStdout() / cmd.ErrOrStderr() for all output — direct os.Stdout writes cannot be captured by tests.
5. 5Re-create the command tree per test — cobra accumulates flag state across Execute() calls on the same instance.

What it can do on your machine

Read from SKILL.md and the folder at commit 8876467. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Edit
  • Write
  • Glob
  • Grep
  • Bash(go:*)
  • Bash(golangci-lint:*)
  • Bash(git:*)
  • Agent
  • WebFetch

  …and 6 more on the same allowed-tools line.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • go

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com
  • pkg.go.dev
  • cobra.dev

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Designed for Claude Code, Codex or similar harness, and for projects using Golang.

  From compatibility in the SKILL.md frontmatter.

Context cost

Golang Spf13 Cobra loads about 2.5k tokens when it runs, and up to ~7.2k if it reads all its reference files. Until then it costs about 77 tokens; SKILL.md has 954 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~77

When it runs · the whole SKILL.md, loaded when a task matches

~2.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~7.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from context-labs/whip at commit 8876467, republished under its MIT licence (© context-labs). 954 words, ~2,474 tokens.

name

golang-spf13-cobra

description

CLI command tree library for Golang using spf13/cobra — cobra.Command, RunE vs Run, PreRun hooks, Args validators, persistent vs local flags, shell completion, testing via SetArgs. Apply when using/adopting cobra or the codebase imports github.com/spf13/cobra. Config: golang-spf13-viper.

allowed-tools

Read, Edit, Write, Glob, Grep, Bash(go:*), Bash(golangci-lint:*), Bash(git:*), Agent, WebFetch, mcp__context7__resolve-library-id, mcp__context7__query-docs, Bash(godig:*), Bash(gopls:*), LSP, mcp__gopls__*

compatibility

Designed for Claude Code, Codex or similar harness, and for projects using Golang.

user-invocable

true

license

MIT

metadata.author

samber

metadata.version

1.1.0

paths

**/*.go

go get github.com/spf13/cobra@latest

var rootCmd = &cobra.Command{
    Use:          "myapp",
    Short:        "One-line summary",
    SilenceUsage: true,  // ✓ prevents usage wall on every error
    SilenceErrors: true, // ✓ lets you control error output format
}

PersistentPreRunE → PreRunE → RunE → PostRunE → PersistentPostRunE

rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file path") // inherited by all subcommands
serveCmd.Flags().IntVar(&port, "port", 8080, "listen port")                     // local to serveCmd only
serveCmd.MarkFlagRequired("port")
serveCmd.MarkFlagsMutuallyExclusive("json", "yaml")

func TestServeCmd(t *testing.T) {
    buf := new(bytes.Buffer)
    rootCmd.SetOut(buf)
    rootCmd.SetArgs([]string{"serve", "--port", "9090"})
    require.NoError(t, rootCmd.Execute())
    assert.Contains(t, buf.String(), "listening on :9090")
}

© context-labs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 6 other files (references) in .agents/skills/golang-spf13-cobra of context-labs/whip.

• SKILL.md
• evals/evals.json
• references/commands-and-args.md
• references/completions.md
• references/flags.md
• references/generators.md
• references/testing.md

Open the folder on GitHubat commit 8876467

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in context-labs/whip, which our catalogue first saw on October 7, 2026.

• aiskillstore/marketplaceskills/samber/golang-spf13-cobra
• samber/cc-skills-golangskills/golang-spf13-cobra