CLI Developer skill

CLI Developer

Core Workflow

1. Analyze UX — Identify user workflows, command hierarchy, common tasks. Validate by listing all commands and their expected --help output before writing code.
2. Design commands — Plan subcommands, flags, arguments, configuration. Confirm flag naming is consistent and no existing signatures are broken.
3. Implement — Build with the appropriate CLI framework for the language (see Reference Guide below). After wiring up commands, run <cli> --help to verify help text renders correctly and <cli> --version to confirm version output.
4. Polish — Add completions, help text, error messages, progress indicators. Verify TTY detection for color output and graceful SIGINT handling.
5. Test — Run cross-platform smoke tests; benchmark startup time (target: <50ms).

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
Design Patterns	references/design-patterns.md	Subcommands, flags, config, architecture
Node.js CLIs	references/node-cli.md	commander, yargs, inquirer, chalk
Python CLIs	references/python-cli.md	click, typer, argparse, rich
Go CLIs	references/go-cli.md	cobra, viper, bubbletea
UX Patterns	references/ux-patterns.md	Progress bars, colors, help text

Quick-Start Example

Node.js (commander)

#!/usr/bin/env node
// npm install commander
const { program } = require('commander');

program
  .name('mytool')
  .description('Example CLI')
  .version('1.0.0');

program
  .command('greet <name>')
  .description('Greet a user')
  .option('-l, --loud', 'uppercase the greeting')
  .action((name, opts) => {
    const msg = `Hello, ${name}!`;
    console.log(opts.loud ? msg.toUpperCase() : msg);
  });

program.parse();

For Python (click/typer) and Go (cobra) quick-start examples, see references/python-cli.md and references/go-cli.md.

Constraints

MUST DO

• Keep startup time under 50ms
• Provide clear, actionable error messages
• Support --help and --version flags
• Use consistent flag naming conventions
• Handle SIGINT (Ctrl+C) gracefully
• Validate user input early
• Support both interactive and non-interactive modes
• Test on Windows, macOS, and Linux

MUST NOT DO

• Block on synchronous I/O unnecessarily — use async reads or stream processing instead.
• Print to stdout when output will be piped — write logs/diagnostics to stderr.
• Use colors when output is not a TTY — detect before applying color:

  // Node.js
  const useColor = process.stdout.isTTY;
  

  # Python
  import sys
  use_color = sys.stdout.isatty()
  

  // Go
  import "golang.org/x/term"
  useColor := term.IsTerminal(int(os.Stdout.Fd()))
  

• Break existing command signatures — treat flag/subcommand renames as breaking changes.
• Require interactive input in CI/CD environments — always provide non-interactive fallbacks via flags or env vars.
• Hardcode paths or platform-specific logic — use os.homedir() / os.UserHomeDir() / Path.home() instead.
• Ship without shell completions — all three frameworks above have built-in completion generation.

Output Templates

When implementing CLI features, provide:

1. Command structure (main entry point, subcommands)
2. Configuration handling (files, env vars, flags)
3. Core implementation with error handling
4. Shell completion scripts if applicable
5. Brief explanation of UX decisions

Knowledge Reference

CLI frameworks (commander, yargs, oclif, click, typer, argparse, cobra, viper), terminal UI (chalk, inquirer, rich, bubbletea), testing (snapshot testing, E2E), distribution (npm, pip, homebrew, releases), performance optimization

Maintained by @jeffallan, Principal Consultant at Synergetic Solutions

Documentation