Maintain clear code organization by placing code in appropriate files, directories, and modules. Respect module boundaries and create logical directory structures that reflect the code's purpose and domain. Key principles: - Place types in dedicated type files (e.g., move `StagehandInitResult` to `types/evals.ts`) - Create domain-specific directories for related functionality (e.g., `lib/a11y` for accessibility utilities) - Respect module boundaries (evals should reference `dist`, not `lib`) - Group related functions in appropriately named files (prompts and prompt building functions belong in `prompts.ts`) Example of proper organization: ```typescript // Before: accessibility functions mixed in handlers // lib/handlers/observeHandler.ts type AccessibilityNode = { ... } function formatSimplifiedTree() { ... } // After: dedicated accessibility module // lib/a11y/utils.ts type AccessibilityNode = { ... } function formatSimplifiedTree() { ... } ``` This approach improves code discoverability, reduces coupling between modules, and makes the codebase easier to navigate and maintain.