Ask Claude to Build a CLI Tool from a Description of What It Should Do

Custom CLI tools save time, but building them from scratch — argument parsing, help text, error handling — is tedious. Describe what you need and Claude builds a proper tool.

"Build a CLI tool called 'dbsnap' that takes a snapshot of a database, 
sanitizes personal data, and saves it as a compressed file. 
It should accept --database, --output, and --sanitize flags."

Claude builds a complete, usable tool with all the pieces you'd write yourself:

# What Claude generates:
dbsnap --database myapp --output ./snapshots --sanitize

# With proper help text:
dbsnap --help

# With validation:
dbsnap --database ""  # Error: --database is required

This works for any kind of tool:

# Project management
"Build a CLI tool that counts lines of code by language, 
excluding vendor directories and test files"

# Development workflow
"Build a tool that checks if all required environment variables 
are set by reading the .env.example file"

# Data processing
"Build a CLI that reads a CSV, validates each row against a schema, 
and outputs a report of errors"

# Infrastructure
"Build a tool that checks the health of all services in our 
docker-compose file and prints a status table"

Specify the language and framework:

# Node.js with Commander
"Build this in Node.js using Commander for argument parsing"

# Python with Click
"Build this in Python using Click with type hints"

# Go with Cobra
"Build this in Go using Cobra — it should compile to a single binary"

# Bash for simplicity
"Build this as a bash script — no external dependencies"

Claude includes the details that make a tool feel professional:

• Help text — --help with descriptions for every flag
• Validation — checks required arguments before running
• Exit codes — proper 0/1 exit codes for scripting
• Color output — formatted tables, progress indicators, colored status
• Config files — optional config file support so you don't repeat flags

Every team has tools that should exist but nobody builds — describe the tool to Claude and it creates something your team can use today.

via Claude Code