Introduction In this post, I’ll walk you through how to call Azure OpenAI APIs from a Copilot declarative agent—without writing any code—by using Microsoft 365 Agents Toolkit. Leveraging OpenAPI specifications, Microsoft 365 Agents Toolkit enables seamless integration with Azure OpenAI, streamlining the development process for Copilot extensibility. Step 1: Create and Import an OpenAPI Specification Microsoft provides a pre-built OpenAPI specification for Azure OpenAI, but it’s often broader than needed. To simplify, I generated a targeted OpenAPI spec with Copilot by using the endpoint URL and a sample request body as a prompt.