Provides patterns for building TypeScript CLI tools distributed via npx - package structure, the bin entry point and shebang, ESM-ready tsconfig, argument parsing, output and exit codes, local testing, and npm publishing. Use when the user asks to "create an npx package", "build a CLI tool with TypeScript", "set up a Node.js CLI", "publish an npm package", "configure package.json bin field", "add CLI argument parsing", or "create an executable npm package", or when writing TypeScript code for a command-line tool distributed via npx. Does not cover general TypeScript style, type design, or non-CLI project layout - see the typescript skill for those.