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Microsoft Copilot Agent Builder lets eligible Microsoft 365 Copilot users create and test declarative agents using natural-language instructions, manual settings, or templates. It is designed for straightforward scenarios—not for building external-service integrations or complex workflows. Microsoft describes the setup as taking “just a few minutes,” but does not publish an independently measured completion time; the actual effort depends on your agent’s scope, sources, permissions, and testing.
What Microsoft Copilot Agent Builder creates
Agent Builder creates declarative agents: customized versions of Microsoft 365 Copilot shaped for a particular task or audience through instructions and selected knowledge sources. You can start by describing what you want the agent to do, configure it manually, or use a template. Templates include a preconfigured description, instructions, and suggested prompts.
Microsoft calls Agent Builder an easy way to build declarative agents for Microsoft 365. It is an in-context quick-start experience for user-initiated scenarios rather than a general-purpose development environment. Microsoft’s Agent Builder overview describes the product and its boundaries.
What to check before you start
- License and tenant availability: Microsoft’s admin guidance describes availability for users with a Microsoft 365 Copilot license or in tenants with Copilot Studio pay-as-you-go enabled. Capabilities can differ by billing model, account type, and license. Ask your Microsoft 365 administrator which features your organization has enabled. Microsoft’s Agent Builder admin guide covers availability and controls; Microsoft Support’s agent guidance notes that feature availability varies by account type and license.
- Supported surface: Microsoft lists microsoft365.com/chat, office.com/chat, and Microsoft Teams desktop and web as places to use Agent Builder. The listed mobile versions do not support it. Check the current product overview if your organization’s interface differs.
- Knowledge access: Decide which sources the agent needs, and confirm you can access them. Available sources can include SharePoint items, public websites, personal work content such as Teams chats and Outlook email, and enabled Microsoft 365 Copilot connectors. Availability and limits depend on the source and license.
- Administrator settings: Administrators can control whether Agent Builder is available in the tenant. If the option is missing, confirm the organization’s settings before troubleshooting the agent itself.
- Scenario fit: If the agent must take actions through external services, connect systems, or run workflows, plan to use Copilot Studio instead of relying on Agent Builder alone.
How to build and test an agent
- Open Microsoft 365 Copilot. Go to a supported surface such as microsoft365.com/chat, office.com/chat, or Teams desktop or web, then select New agent.
- Choose how to begin. Describe the agent’s intended behavior in natural language, configure it manually, or select a template. Be specific about the task, intended audience, and the kind of response you want.
- Write and refine the instructions. State the agent’s role, what it should do, and any relevant limits. Clear instructions help distinguish the agent’s purpose from the general Microsoft 365 Copilot experience.
- Select knowledge sources. Choose relevant sources, such as appropriate SharePoint content or other available work and web sources. Use only sources you are authorized to access and that suit the task.
- Try the agent. Open the Try it tab and test realistic prompts, including questions that reveal whether the agent uses the intended sources and follows its instructions.
- Revise and retest. Adjust instructions, knowledge, and suggested prompts based on the results. Do not share or deploy the agent until you have checked its behavior and the organization’s permission and administration requirements.
Microsoft’s build guidance also documents code interpreter for math, data analysis, and visualizations, as well as image generation from prompts. These and other capabilities may vary with licensing and configuration.
#1 Best Overall
What Agent Builder can—and cannot—do
Agent Builder is a practical fit when an agent needs to answer questions or assist with a straightforward task using instructions and selected knowledge. Its documented build process supports natural-language authoring, manual configuration, templates, and testing.
Its key boundary is action integration: Microsoft says Agent Builder does not support authoring actions that integrate external services. If you need low-code actions, connectors, or workflows, Microsoft directs you to Copilot Studio’s agent-building options. That distinction matters when planning an agent that must do something in another system rather than provide responses based on its instructions and available knowledge.
Agent Builder or Copilot Studio?
| Decision point | Agent Builder | Copilot Studio |
|---|---|---|
| Best fit | Quick, straightforward declarative agents built in the Microsoft 365 Copilot experience. | Agents that need low-code actions, external-service connections, or workflows. |
| How you build | Natural-language description, manual configuration, or templates, followed by testing. | Microsoft’s documented path for low-code actions, connectors, and workflows. |
| Knowledge and connections | Can use available sources such as SharePoint, public websites, personal work content, and enabled Microsoft 365 Copilot connectors; availability varies. | Use when the scenario requires the documented action, connector, or workflow capabilities. |
| Availability and billing | Availability and capability depend on the user’s license, tenant configuration, and billing model. | Check the organization’s Copilot Studio licensing and billing configuration for the required features. |
| Administration | Tenant administrators can control whether Agent Builder is available. | Confirm the organization’s Copilot Studio settings and policies with its administrator. |
For a user-initiated assistant that works with instructions and permitted knowledge, start with Agent Builder. Choose Copilot Studio when the requirement includes actions or orchestrated workflows; Microsoft’s overview and Copilot Studio guidance explain this product boundary.
Data handling and organizational controls
Microsoft documents that Agent Builder capabilities are processed by Copilot Studio and that data may flow to and from Microsoft 365 and Copilot Studio. The information involved can include Microsoft 365 data, prompts, instructions, configurations, and output content. Microsoft also states that agents built with Agent Builder do not consume the tenant’s Dataverse storage entitlement. These product facts do not determine whether a particular use is appropriate under your organization’s privacy, security, or compliance rules. For that decision, review your organization’s current terms, configuration, and administrator guidance alongside Microsoft’s product documentation.
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