todoListMiddleware

Creates a middleware that provides todo list management capabilities to agents.

This middleware adds a write_todos tool that allows agents to create and manage structured task lists for complex multi-step operations. It's designed to help agents track progress, organize complex tasks, and provide users with visibility into task completion status.

The middleware automatically injects system prompts that guide the agent on when and how to use the todo functionality effectively. It also enforces that the write_todos tool is called at most once per model turn, since the tool replaces the entire todo list and parallel calls would create ambiguity about precedence.