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GlossaryProductsIntermediate

Prefab

Prefab is a tool for building interactive elements in Microsoft Copilot apps, working with FastMCP.

In plain terms

Prefab is a tool that helps developers create interactive buttons and other elements for Microsoft Copilot applications. Think of it like a set of pre-made building blocks that you can easily add to your app.

For example, instead of just typing a question to a chatbot, you might use Prefab to add a button that says 'Show me the weather.' Clicking that button then triggers a specific action within the app.

The expert version

Prefab is a component library and development tool integrated with FastMCP, designed for constructing rich user interfaces within Microsoft Copilot applications. It allows developers to move beyond simple text-based interactions by providing pre-built UI elements that can be easily incorporated and customized.

This approach simplifies the creation of interactive experiences, enabling faster development cycles for applications that require user input beyond natural language commands.

Why it matters now

Microsoft Copilot is developing tools like FastMCP to create more interactive applications. Prefab appears as a component within this ecosystem, suggesting a move towards structured, reusable elements for building these more complex Copilot experiences beyond simple text chat.

Where it shows up 1 items, newest first
How each company uses it
Microsoft Copilot
Microsoft Copilot is using Prefab as part of its FastMCP framework for building interactive applications, indicating a focus on modular components for its AI.
Related terms

Microsoft CopilotFastMCPUI componentsApplication developmentChatbotsInteractive interfaces

Often confused with
Prefabrication
In construction, prefabrication refers to building components of
Component library
While Prefab is a type of component library, the term 'compon
Template
A template provides a basic structure, whereas Prefab offers ready-to-
Origin

The term 'prefab' in software development often refers to pre-built, reusable components or templates. In this context, it's specifically tied to Microsoft's ecosystem for building Microsoft Copilot applications.

Try this about 5 minutes

Explore the Microsoft Copilot documentation for examples of FastMCP and Prefab in action. Look for tutorials that demonstrate adding interactive buttons or forms to a Copilot app. Try to identify where pre-built UI elements are being used to enhance user interaction.

Try it: Playbook entries that use thisPlaybook →

The Playbook: reusable how-tos, prompts, configs and tips pulled out of the news.

Questions people ask

What is FastMCP?
FastMCP is a framework or toolset used with Microsoft Copilot to help developers build interactive applications more easily.
Can I use Prefab with other AI assistants?
Prefab is specifically designed for building applications within the Microsoft Copilot ecosystem. Its use is tied to Microsoft's tools and platforms.

First seen on Subvolts Sep 10, 2026. Updated Sep 17, 2026. Written by an AI model from the items above and reviewed against them weekly; report an error.