Upcoming changes to Agents in SharePoint and OneDrive

SharePoint and OneDrive agents using the .agent file format will be upgraded to integrate with Microsoft Copilot’s extensibility ecosystem. From mid-November 2026, new agents use the Copilot Agent Builder, with .agent files supported until March 2027, after which they stop working. Organizations should prepare to upgrade agents and adopt new management and governance tools. What and Why: We are upgrading the agent experience in SharePoint and OneDrive to better align with the Microsoft Copilot extensibility ecosystem, specifically to ensure that these agents are part of Copilot app home experiences (MC1479277) and the Microsoft plugin registry (MC1484008), the shared catalog for discovering, publishing, and governing organization-approved and custom-built plugins across Microsoft Copilot experiences (Chat, Cowork, Code, Autopilot) and Microsoft 365 apps (Word, PowerPoint, Excel), OneDrive and SharePoint.  Agents using .agent file format will continue to work across SharePoint, Teams, and Copilot app until the end of March 2027. With upcoming updates, agent owners can start upgrading each experience. The right path depends on what each agent helps users accomplish today:  Use Copilot in SharePoint for site-level questions and answers. Convert the .agent file to a skill for Copilot in SharePoint when it supports a focused task or business outcome specific to the site. Upgrade to a declarative agent or update your custom engine agent that was published to the SharePoint channel, when users need a content-grounded, conversational experience across Microsoft 365. Changes to agent creation and building experiences in OneDrive and SharePoint will support this transition: Creating agents will use the Microsoft Copilot Agent Builder An Upgrade button will appear in the SharePoint builder so you can upgrade the agent to use the Microsoft Copilot Agent Builder.  A convert-agent-file-to-skill skill will be available in Copilot in SharePoint Changes to the user experience of the site will support this transition: The Agent Chat web part is coming soon to allow any agent from the Plugin store to appear on the SharePoint site with more intention and control for greater reach and impact Copilot in SharePoint is already available worldwide and is coming soon to Government clouds. Rollout Schedule: General Availability (Worldwide and […]

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