rust-cli-builder

# Rust CLI Tool Builder ## When to use Use this skill when you need to: - Scaffold a new Rust CLI tool from scratch with clap - Add subcommands to an existing CLI application - Implement config file loading (TOML/JSON/YAML) - Set up proper error handling with anyhow/thiserror - Add colored and formatted terminal output - Structure a CLI project for distribution via cargo install or GitHub releases ## Phase 1: Explore (Plan Mode) Enter plan mode. Before writing any code, explore the existing project: ### If extending an existing project - Find `Cargo.toml` and check current dependencies (clap version, serde, tokio, etc.) - Locate the CLI entry point (`src/main.rs` or `src/cli.rs`) - Check if clap is using derive macros or builder pattern - Identify existing subcommand structure - Look for existing error types, config structs, and output formatting - Check if there's a `src/lib.rs` separating library logic from CLI ### If starting from scratch - Check the workspace for any existing Rust projects or workspace `Cargo.toml` - Look for a `.cargo/config.toml` with custom settings - Check for `rust-toolchain.toml` to know the target Rust edition ## Phase 2: Interview (AskUserQuestion) Use AskUserQuestion to clarify requirements. Ask in rounds. ### Round 1: Tool purpose and commands ``` Question: "What kind of CLI tool are you building?" Header: "Tool type" Options: - "Single command (like ripgrep, curl)" — One main action with flags and arguments - "Multi-command (like...