Primitive is email infrastructure designed specifically for AI agents, enabling them to communicate with people and other agents through the familiar, widely used email protocol. Its services include a REST API and hosted Model Context Protocol server for sending, receiving, searching, and managing email, plus managed *.primitive.email addresses that run JavaScript functions on incoming messages. Agents can also use a chat feature that sends a message and returns the threaded reply in one interaction.

Primitive handles the underlying mail operations, including domain authentication, spam filtering, bounce and complaint processing, and sending reputation. Customers can connect custom domains for transactional email, route inbound messages to webhooks or hosted functions, and track delivery status. The platform provides official Node.js, Python, and Go SDKs, a command-line tool, and integrations for compatible agent environments. It also offers a ChatGPT app with an interface for viewing an inbox inside the agent host. Primitive is suited to agents that need their own email identity without operating a mail server or managing SMTP credentials.