When handling errors, preserve the original error context and avoid exposing internal representations to users. Use `IoResultExt::context()` to attach meaningful path information to I/O errors, and maintain error source chains using `.with_source()` or similar mechanisms. For user-facing error messages, avoid displaying internal data structures that users cannot understand. Instead, provide clear, actionable error descriptions. Example of good error context preservation: ```rust // Good: Attach path context to I/O errors std::fs::write(&jj_gitignore_path, "/*\n") .context(&jj_gitignore_path)?; // Good: Preserve error source chain TemplateParseError::expression(message, span).with_source(err) // Bad: Expose internal representation to user format!("The given revset '{:?}' was expected to have {} elements", set, count) // Good: User-friendly message format!("revset that was expected to have {} revision had {} revisions", expected, actual) ``` This approach ensures that developers get sufficient debugging information while users receive comprehensible error messages. The error context helps with troubleshooting without overwhelming end users with implementation details.