Pizza Bot: Open-Source Inbox for Background AI Agents

A team of developers working at AWS recently open-sourced Pizza Bot, a self-hosted application designed to let AI agents run tasks in the background and return results through an inbox-style interface. Agents can perform scheduled or webhook-triggered work, delegate tasks to specialized workers, and pause for human approval when needed.

Pizza Bot provides an email-style inbox for managing long-running AI agent workflows. The Apache 2.0-licensed tool uses a client-server architecture, allowing users to delegate complex tasks without continuous monitoring.

Source: AWS blog

Described by the authors as an option that offers "the developer details, minus the grease," Pizza Bot supports multiple model providers, MCP servers, and Agent Skills while keeping data and agent state on the user’s machine. Joseph Dolivo, principal technologist at AWS, and Igor Fil, solutions architect at AWS, use the inbox analogy to explain the design:

You don’t send an email and then sit watching the outbox until the reply lands. Pizza Bot is shaped like an email client for the same reason: a thread is a unit of work you come back to rather than a session you have to attend.

Source: AWS blog

The design is based on four requirements: agents can inspect multiple sources, work in the background, request approval before consequential actions, and notify users when work is complete. The inbox organizes this work into All, Unread, and Action queues, while an Activity panel shows tasks delegated to specialist agents and their progress.