Microsoft is shifting from passive AI assistants to autonomous agents that can execute long-running tasks across Office 365 products like Word, Excel, and PowerPoint. The company's Build 2026 conference, opening June 2 in San Francisco, reflects this strategic pivot, with the entire event organized around agentic AI workflows, GitHub Copilot advances, and Windows-native AI development.

What Is Agent Mode and Why Does It Matter?

Agent Mode represents a fundamental shift in how AI assistants work. Instead of waiting for users to give commands and then responding immediately, agents operate asynchronously, meaning they can work independently on complex tasks over time. CEO Satya Nadella described these as "async coworkers that can execute long-running tasks across key domains," marking a departure from the synchronous assistant model that has dominated AI tools for the past few years.

Satya Nadella

This transition is already underway. Microsoft Agent 365, the enterprise control plane for managing AI agents across an organization, reached general availability on May 1, 2026. The Build conference will expand on that foundation, helping developers understand how to build and deploy agents safely within their organizations.

How to Prepare for Agent-Based Development?

• Security Design: Attend sessions like "Claws on Windows: Designing Safe, Bounded Agent Actions," which examines real design failures and teaches developers how to architect safer alternatives for giving AI agents system access without creating security vulnerabilities.
• Multi-Agent Workflows: Learn about multi-agent support inside Visual Studio Code (VS Code) and deeper GitHub-Azure integration, which will enable developers to coordinate multiple agents working together on complex tasks.
• Terminal Integration: Explore Copilot CLI, which reached general availability in March 2026, and expect Build to extend that into multi-agent terminal workflows for command-line development.

What's Happening With GitHub Copilot?

GitHub Copilot features prominently at Build 2026, with multiple sessions dedicated to its evolution. The Information reported that Microsoft may introduce a new coding model to expand GitHub Copilot adoption, alongside specialized models for advanced reasoning, images, and speech. This suggests the company is not relying on a single AI model but building a suite of specialized tools for different coding tasks.

The Copilot CLI, which allows developers to use AI assistance directly in their terminal, reached general availability in March. Build is expected to extend that capability into multi-agent terminal workflows, enabling developers to chain multiple AI-assisted commands together for complex development tasks.

Why Is Windows Local AI Getting Its Own Conference Track?

Microsoft is dedicating an entire conference track to Windows as a developer platform for local AI. This reflects a broader industry trend toward running AI models directly on devices rather than sending all data to cloud servers. Sessions will cover APIs for on-device model execution and Microsoft's Foundry Local tool, which enables developers to run AI models locally on Windows machines.

The May 30 Windows 11 Insider build shipped a customizable Start menu and expanded local AI capabilities ahead of the keynote, signaling that local AI development is becoming a core part of the Windows platform strategy. Microsoft is also deepening its WinUI 3 push, a modern framework for building native Windows applications. Rudy Huyn, Partner Architect at Microsoft, confirmed in March that he is forming a dedicated team to build 100% native Windows apps using WinUI 3, ending reliance on WebView2 wrappers.

"Agent Mode is now the default mode across several Office 365 Copilot products, including Word, Excel and PowerPoint," said Satya Nadella.

Satya Nadella, CEO at Microsoft

What Performance Improvements Are Coming to Windows Development?

Microsoft is making tangible performance improvements to its development tools. Benchmarks from software engineer Beth Pan show a 25% performance improvement for WinUI 3's File Explorer component, with 41% fewer memory allocations and 45% fewer function calls compared to previous versions. The Start menu itself is being rebuilt in WinUI to reduce latency, demonstrating Microsoft's commitment to making Windows development faster and more efficient.

These improvements matter because developers spend significant time in their tools. Faster performance means less waiting, fewer system resources consumed, and a better overall development experience. As AI agents become more prevalent in development workflows, having performant underlying tools becomes even more critical.

What Should Developers Expect From Build 2026?

Build 2026 runs June 2-3 at Fort Mason Center in San Francisco. CEO Satya Nadella kicks off the two-day event at 9:30 a.m. PT with a keynote the company has billed as "no fluff." In-person tickets run $1,099, and the keynote streams free on build.microsoft.com and YouTube. All sessions will be available on demand after the event.

Notably, Microsoft has confirmed that no Windows 12 announcement is on the agenda. Windows Central's Zac Bowden reported that 2027 is the earliest realistic announcement window for a new Windows version, debunking viral speculation about a 2026 launch. Instead, Build will focus on how Windows serves as a platform for local AI development and how developers can build agent-based applications safely and efficiently.