Deno CLI Tool

Rules for building single-file CLI tools with Deno. For general scripting rules (imports, built-in API preference, prohibited technologies), see script-rules.

Core Principles

1. Single file — one .ts file unless explicitly told otherwise
2. Executable via shebang — include permissions in shebang, install with chmod +x
3. No build step — Deno runs TypeScript directly

Tech Stack

Argument Parsing (REQUIRED: Effect CLI)

Always use Effect CLI for argument parsing: