CLAUDE.md — Rust CLI

Commands

• cargo build — build
• cargo test — test
• cargo clippy — lint
• cargo fmt — format

Dependencies

• clap — CLI argument parsing with derive
• tokio — async runtime
• anyhow — error handling in applications
• thiserror — error types in libraries
• serde + serde_json — serialization
• tracing — structured logging

Code Style

• Use anyhow::Result in application code
• Use thiserror for library error types
• Prefer iterators over manual loops
• Use builder pattern for complex structs
• Document public APIs with doc comments

Error Handling

• Never use unwrap() in production code
• Use ? operator for error propagation
• Provide context with .context() from anyhow
• Log errors at the boundary, not deep in the stack