rust-cli-builder

Topics in the source

• Rust CLI Tool Builder
• When to use
• Phase 1: Explore (Plan Mode)
• If extending an existing project
• If starting from scratch
• Phase 2: Interview (AskUserQuestion)
• Round 1: Tool purpose and commands
• Round 2: Subcommands (if multi-command)

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 Enter plan mode. Before writing any code, explore the 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 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 Use AskUserQuestion to clarify requirements. Ask in rounds. Write a concrete implementation plan covering: 1. Project structure — Cargo.toml dependencies, src/ file layout 2. CLI definition — clap derive structs for all comma

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