SharePoint agent upgrade guidance sets out the move beyond .agent files
**SharePoint and OneDrive agents are moving from .agent files to the Microsoft 365 agent platform.
** Microsoft’s October 30 preparation guide, supported by its upgrade documentation, says new agent creation will move to Copilot Agent Builder from mid-November 2026.
Existing .agent experiences remain supported through March 2027 and stop responding afterward; upgrades are not automatic.
Owners can choose Agent Builder, a site skill, Copilot in SharePoint or an appropriate Copilot Studio publishing path. Sharing, source permissions, licensing and page or Teams placements need separate checks.
Copilot in SharePoint requires a Copilot license; advanced work also uses Copilot Credits.
Partner briefing
- What it is
Microsoft published preparation guidance for upgrading SharePoint and OneDrive agents.
- What’s changing
Agent creation moves to Agent Builder from mid-November; legacy .agent support continues through March 2027.
- Why it matters
Existing agents require an owner-led transition and validation of access, licensing and placement.
- Who it affects
SharePoint administrators, agent owners and Microsoft 365 implementation partners.