Summary
- Microsoft Copilot Studio is adding a Custom Grader Library that lets users create custom graders once and reuse them across multiple evaluations.
- The change makes custom graders reusable evaluation assets, which should reduce duplicate grading logic and improve evaluation consistency.
- This is a Copilot Studio / Power Platform feature update intended for awareness only.
- No admin action is required.
Microsoft is introducing a public preview for the Custom Grader Library in Microsoft Copilot Studio starting mid September 2026. This capability lets makers build custom graders once and deploy them across multiple evaluations to reduce duplicate logic. Administrators should note that this feature is informational for now and requires no immediate steps.
Administrator impact: No direct administrator action is required.
End user impact: Makers can reuse custom graders across multiple evaluations to improve consistency.
Score rationale: This is a standard preview feature release that brings minor enhancements with no administrative disruption.
Message ID: MC1472547
Primary Service: Power Platform
Admin Impact: Low
User Impact: Low
Release Start: 15 Sept 2026
Release End: 15 Sept 2026
Service: M365 Copilot, Power Platform
Category: Stay informed
Tags: New feature
Rollout: September 2026
Published: 16 Sept 2026
Expires: 16 Oct 2026
Last updated: 16 Sept 2026
History
9/15/2026 Item Added to Message Center
Microsoft Message
We are announcing the ability to create custom graders once and reuse them across multiple evaluations using Custom Grader Library in Microsoft Copilot Studio. This feature will be available in public preview on September 15, 2026.
How does this affect me?
Users will be able to create custom graders once and reuse them across multiple evaluations. Custom graders will become reusable evaluation assets, making reuse explicit and helping reduce duplicate grading logic. This will improve consistency across evaluations and support more reliable comparison and regression analysis over time.
What action do I need to take?
This message is for awareness, and no action is required.