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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.
July 2025
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 Copilot Studio agent builder, 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 Copilot Studio agent builder 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 agent builder
Add Outlook email and Teams group, channel, and meeting chats as knowledge when you use Copilot Studio agent builder to build your agent. For more information, see Add knowledge sources.
May 2025
Microsoft 365 Agents Toolkit
Use Microsoft 365 Agents Toolkit (an evolution of Teams 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 2.3 for Microsoft 365 Copilot adds support calling functions in an Office Add-in.
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
Copilot Studio message usage rates
Updated the usage rates for Copilot Studio messages. For more information, see Copilot Studio message usage rates.
Email as knowledge
Email is now available as a knowledge source for agents build with Microsoft 365 Agents Toolkit (an evolution of Teams Toolkit). For more information, see Email knowledge.
Copilot Studio agent builder templates
Use templates in Copilot Studio agent builder to streamline your agent development process. For more information, see Agent builder 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 agent builder available in Copilot Chat
Microsoft 365 Copilot Chat users can now access Copilot Studio agent builder to build agents in the Microsoft 365 Copilot app and the Copilot app in Teams.
Add websites as knowledge in agent builder
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 Agent capabilities for Microsoft 365 users.