priority: medium

Model Routing & AI Guidance

When to Use Sonnet 4.5 vs Haiku 4.5

Use Sonnet 4.5 (claude-sonnet-4-5-20250929) for:

• •Rust core architecture & design decisions
• •Complex algorithm optimization
• •Safety-critical code changes
• •Cross-cutting refactoring
• •Error handling strategy & thiserror design

Use Haiku 4.5 (claude-haiku-4-5-20251001) for:

• •Python/TypeScript/Ruby/PHP binding engineering
• •Test writing & fixture management
• •CLI tool development
• •Integration issues (build system, CI/CD)
• •Dependency updates & version bumping

Applies to all tasks in this project unless explicitly overridden.