Plan a TypeScript migration across 3 AI tools

Your Express API has 60 endpoints in plain JavaScript, and the team is moving it to strict TypeScript. You have 3 AI tools: an autonomous coding agent with access to the whole repo, inline completion in your editor and a chat model. The API has decent integration tests and no types anywhere.

How do you run the migration? Decide which tool does which part, in what order, and where a person reviews before the next step.