AI-103: Developing AI Apps and Agents on Azure

The conversation object in Foundry Agent Service is the durable, server-side record—identified by a conversation ID—that stores the full interaction history, including user messages, tool calls, and tool outputs. Because it is persisted independently of any single session (stored durably, e.g., in Cosmos DB), referencing the same conversation ID in later requests, even days later, lets the agent automatically pull in and continue from the entire prior history without the caller needing to resend it. This satisfies the requirement for a durable ID that preserves full context across turns and sessions, distinguishing it from an agent (the reusable definition of instructions/tools/model), a response (a single generation turn's output), or an output item (an individual message or tool-call entry within a response).