Microsoft 365 Copilot extensibility documentation

Learn how to build custom Copilot experiences by using Microsoft 365 extensibility options including agents, connectors, and Copilot APIs.

Get started with Copilot extensibility

Get started

• Overview
• Planning guide
• Licensing and cost considerations

Create and manage agents

How-To Guide

• Agents overview
• Build a declarative agent
• Build a custom engine agent
• Manage agents in the Microsoft 365 admin center

Extend with plugins and connectors

How-To Guide

• Add plugins to declarative agents
• Use Copilot connectors
• Build a custom Copilot connector

Use developer tools and APIs

Reference

• Microsoft 365 Agents Toolkit
• Microsoft 365 Agents SDK
• Microsoft 365 Copilot APIs
• Copilot Studio documentation
• Microsoft Agent 365 (early access preview)