Microsoft 365
Declarative Agents, Custom Engine Agents or Copilot Connectors? Choosing a Microsoft 365 Copilot Extensibility Path
Once you have decided to extend Microsoft 365 Copilot, there are three ways to do it, and they are not interchangeable. Copilot connectors change what Copilot knows, declarative agents change how it behaves, and custom engine agents replace its engine. This guide compares the three on licensing, governance and who carries the risk, with every claim checked against Microsoft's documentation in September 2026.
15 min read