We’re progressively adding typing support to the codebase using ty. This issue tracks the overall progress as we extend coverage directory by directory.

Current status

The tooling is already in place. Type checking is enabled for a subset of directories

You can run it locally with:

make typing

How to contribute

To add typing support to a new file or directory:

• Register it in utils/check_types.py under CHECKER_CONFIG
• Run make typing
• Fix any reported issues

Helper resources

There is an internal skill to assist with adding or fixing typing when using AI agents

.ai/skills/add-or-fix-type-checking/SKILL.md

This guide is continuously refined as we make progress, so it’s a good starting point.