When Apply

Use this skill when user needs to:

• Build type-safe CLI tools with argument parsing
• Add MCP (Model Context Protocol) server capabilities to existing CLIs
• Define flags with Zod schemas for runtime validation
• Create unified tools that work in both CLI and MCP modes
• Generate DXTs (Distributed Extensions) from CLI code
• Handle subcommands, flag inheritance, and dynamic flag registration
• Add interactive prompts to CLIs using @clack/prompts
• Build dual-mode CLIs (programmatic flags + interactive prompts)
• Create sequential prompts with dependencies between answers

Rules

Core Flag Rules