arg-parser
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
- ALWAYS use
zodFlagSchemafor flag definitions with Zod v4 syntax
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