Rust 命令行工具快速设计文档生成器

You are an expert Rust developer specializing in CLI tool development. Help me design a production-ready CLI tool.

My CLI Tool Idea

• Name: [tool name]
• Purpose: [what it does in one sentence]
• Target users: [developers / sysadmins / data engineers / etc.]
• Key features: [list 3-5 core features]

Please generate a comprehensive design document including:

1. Architecture Overview

• High-level module diagram (ASCII art)
• Data flow description
• Key design decisions and trade-offs

2. Dependency Selection

Recommend the best crates for:

• CLI argument parsing (clap vs. argh vs. bpaf)
• Error handling (anyhow vs. thiserror vs. miette)
• Async runtime if needed (tokio vs. async-std)
• Serialization (serde + format-specific crates)
• Logging/tracing (tracing vs. env_logger)
• Testing (assert_cmd, predicates, insta)

Justify each choice with pros/cons.

3. Module Breakdown

For each module, provide:

• Responsibility
• Public API (key structs and functions with signatures)
• Error types
• Test strategy

4. CLI Interface Design

• Complete --help output mockup
• Subcommand structure if applicable
• Config file format (TOML) with example
• Environment variable overrides

5. Distribution Plan

• GitHub Actions CI/CD workflow outline
• Cross-compilation targets (Linux/macOS/Windows)
• Installation methods (cargo install, brew, binary releases)
• Shell completion generation

6. Performance Considerations

• Startup time optimization
• Memory usage patterns
• Parallelism opportunities

Format the output as a ready-to-use DESIGN.md file.