todo

Annotation used to mark state attributes as omitted from input schema.

Create and manage a structured task list for your current work session.

Base middleware class for an agent.

Subclass this and implement any of the defined methods to customize agent behavior between steps in the main agent loop.

State schema for the agent.

Model request information for the agent.

Response from model execution including messages and optional structured output.

The result will usually contain a single AIMessage, but may include an additional ToolMessage if the model used a tool for structured output.

A single todo item with content and status.

State schema for the todo middleware.

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.