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As a developer, you can extend, enrich, and customize Microsoft 365 Copilot for the unique way your customers work. This article provides the latest information about what's new in Microsoft 365 Copilot extensibility.
For the latest information, announcements, and news about preview and generally available (GA) features, follow the Microsoft 365 Copilot developer blog.
November 2025
People knowledge source in Copilot Studio lite experience
The People knowledge source is now available in the Copilot Studio lite experience, allowing agents to answer questions about individuals in your organization. For more information, see People data and Add knowledge sources to your declarative agent.
Agent Builder in Microsoft 365 Copilot is available in GCCM
The Agent Builder feature in Microsoft 365 Copilot is now available in the Microsoft 365 Government Community Cloud – Moderate (GCCM) environment.
Embedded file content file size limit increase
You can now upload files up to 512 MB in size when you embed file content as knowledge in Agent Builder in Microsoft 365 Copilot. For more information, see File size limits.
October 2025
New admin controls for agent sharing
Tenant administrators can now govern who is allowed to share agents created in Microsoft 365 Copilot. These controls help organizations maintain compliance and prevent oversharing of agents. For more information, see Share an agent.
Copy an agent to Copilot Studio
You can copy your declarative agent from Microsoft 365 Copilot to Copilot Studio by using the Copy to full experience feature. This unlocks advanced lifecycle management, analytics, governance controls, and deeper enterprise integration options.
For details, see Copy an agent to Copilot Studio.
Use the Search API (preview) to perform semantic search
The Microsoft 365 Copilot Search API (preview) enables developers to perform semantic search across OneDrive content using natural language queries with contextual understanding and intelligent results. For more information, see Overview of the Search API.
Users with usage billing have access to additional knowledge sources in Microsoft 365 Copilot
Users who are configured with usage billing in the Microsoft 365 admin center now have access to embedded file content, SharePoint data, and Microsoft 365 Copilot connectors custom knowledge sources when they use Microsoft 365 Copilot to create agents.
Microsoft 365 Copilot Chat API (preview)
The Microsoft 365 Copilot Chat API (preview) enables you to programmatically engage in multi-turn conversations with Microsoft 365 Copilot, grounded in enterprise search and web search. For more information, see Overview of the Microsoft 365 Copilot Chat API (preview).
August 2025
Use Teams meetings as a knowledge source in Microsoft 365 Copilot
Teams meetings are now available as a knowledge source when you use Microsoft 365 Copilot to create agents. For more information, see Add knowledge sources to your declarative agent.
July 2025
Scope Copilot connector data sources
You can now scope Copilot connectors to specific data attributes when you use Microsoft 365 Copilot to create your agent. For more information, see Scope Copilot connector data sources.
Declarative agent manifest version 1.5
A new version of the declarative agent manifest schema is available. Declarative agent manifest schema version 1.5 adds the following:
- Added the meetings capability to the list of
capabilities, which allows agents to search meetings in the organization.
Disclaimers in declarative agents
Added the disclaimers property to the Declarative agent manifest object in schema version 1.4.
Embedded file content file size limit increase
You can now upload files up to 100 MBs in size when you embed file content as knowledge in Microsoft 365 Copilot. For more information, see File size limits.
Increased SharePoint file limit for agents
You can now specify up to 100 SharePoint files as knowledge when you use Microsoft 365 Copilot, up from a limit of 20 files. For more information, see SharePoint content.
Build Microsoft 365 Copilot connectors for people data (preview)
Build connectors to ingest people data from your source systems into Microsoft Graph for Microsoft 365 Copilot. For more information, see Build Microsoft 365 Copilot connectors for people data (preview).
Agents supported in Microsoft 365 Government clouds
Limited support for declarative agents is available for Microsoft 365 Government tenants. Support is now available for Government Community Cloud (GCC) tenants.
Asynchronous and proactive messages in custom engine agents
You can implement asynchronous and proactive message flows in your custom engine agents. For more information, see Implement asynchronous and proactive messaging in custom engine agents.
Convert declarative agents to custom engine agents
You can convert your declarative agent to a custom engine agent to take advantage of advanced functionality and workflows. For more information, see Convert your declarative agent to a custom engine agent.
Prioritize declarative agent knowledge sources
You can configure your agent to prioritize the knowledge sources that you provide rather than general knowledge in its responses. For more information, for Microsoft 365 Copilot, see Prioritize your knowledge sources; for Microsoft 365 Agents Toolkit, see Special instructions object.
Custom engine agents generally available
Custom engine agents for Microsoft 365 Copilot are now generally available (GA). For more information, see Custom engine agent overview.
June 2025
Maximum number of conversation starters for declarative agents
You can now add up to 12 conversation starters to your declarative agent when you use the Microsoft 365 Agents Toolkit to create your agent.
Embedded file content as knowledge
Use the file upload feature in Microsoft 365 Copilot to upload files from your device or the cloud to use as knowledge for your agent. For more information, see Embedded file content.
Use the Retrieval API (preview) to retrieve data
The Microsoft 365 Copilot Retrieval API (preview) allows you to retrieve relevant content from SharePoint and Copilot connectors. For more information, see Overview of the Retrieval API.
Microsoft 365 Copilot API client libraries
Use the Copilot API libraries to work with Microsoft 365 Copilot APIs. For more information, see Microsoft 365 Copilot APIs (preview).
Outlook email and Teams chats knowledge in Microsoft 365 Copilot
Add Outlook email and Teams group, channel, and meeting chats as knowledge when you use Microsoft 365 Copilot to build your agent. For more information, see Add knowledge sources.
May 2025
Microsoft 365 Agents Toolkit
Use Microsoft 365 Agents Toolkit to Build declarative agents and Build Copilot connectors.
Microsoft 365 Copilot APIs
The Microsoft 365 Copilot APIs provide a comprehensive set of capabilities that enable you to build AI-powered applications grounded in enterprise data. For more information, see Microsoft 365 Copilot APIs overview.
API plugin manifest version 2.3
A new version of the API plugin manifest schema is available. API plugin manifest schema 2.4 for Microsoft 365 Copilot adds support for Model Context Protocol (MCP) servers, enhanced response semantics with file references, and improved confirmation handling.
Declarative agent manifest version 1.4
A new version of the declarative agent manifest schema is available. Declarative agent manifest schema version 1.4 adds the following.
- Added the
behavior_overridesproperty to the Declarative agent manifest object. - Added the
part_typeandpart_idproperties to the Items by SharePoint IDs object. - Added the Scenario models capability.
April 2025
Email as knowledge
Email is now available as a knowledge source for agents build with Microsoft 365 Agents Toolkit. For more information, see Email knowledge.
Copilot Studio agent templates
Use templates in Copilot Studio to streamline your agent development process. For more information, see Agent templates overview.
Document interaction for declarative agents in Word
Declarative agents in the Copilot experience in Word can interact with the open document. Users can provide the current selection to the agent and can insert images provided by the agent into the document.
March 2025
Declarative agent manifest version 1.3
A new version of the declarative agent manifest schema is available. Declarative agent manifest schema version 1.3 adds support for the following capabilities:
February 2025
Copilot Studio available in Copilot Chat
Microsoft 365 Copilot Chat users can now access Copilot Studio to build agents in the Microsoft 365 Copilot app and the Copilot app in Teams.
Add websites as knowledge in Copilot Studio
You can add specific public websites as agent knowledge sources to make your agent context-aware. For details, see Web content.
Custom engine agents available in Copilot app (preview)
Custom engine agents are now available to users who have Microsoft 365 Copilot licenses or users in tenants with metering enabled in the Microsoft 365 Copilot app (for preview), in addition to Teams.
January 2025
Links are no longer redacted in Copilot responses
Links to organizational and web resources are no longer redacted from Copilot responses. Links that don't explicitly match grounding data or resources defined in the agent manifest continue to be redacted.
Build agents for Microsoft 365 Copilot Chat
You can now build agents for Microsoft 365 users who don't have a Microsoft 365 Copilot license, grounded on the web and with limited capabilities. For more information, see Microsoft 365 Copilot developer licenses.