Write a CLI Tool

Write a command-line tool with the following specification:

Tool name: [name]
Purpose: [what does it do?]
Language: [e.g. Node.js / Python / Go / Bash]
Commands to support: [list the main commands and what each does]
Input: [what does the user pass in — flags, arguments, stdin, config file?]
Output: [what does it produce — stdout, files, formatted table, JSON?]
Error handling requirements: [how should it handle bad input, missing files, network failures?]

Implement:
1. Main entry point with argument parsing
2. Each command as a separate function/module
3. Help text for each command (--help flag)
4. Coloured output where appropriate (success / warning / error states)
5. Exit codes: 0 for success, non-zero for errors — document which codes mean what
6. Config file support (if applicable): how to read from a config file vs. CLI flags

Also provide:
- Installation instructions
- 3 example usage commands with expected output