Overview
Microsoft Build 2025 kicked off with a landmark opening keynote from CEO Satya Nadella, setting the tone for what the company described as a pivotal moment in computing history. Delivered live from Seattle, the keynote declared the arrival of the “age of AI agents” — a shift away from AI that merely answers questions toward AI that autonomously plans, decides, and executes complex tasks across platforms and applications.
This was not just a product announcement event. It was a vision statement for the next era of the internet itself.
The Central Theme: The Agentic Web
Nadella opened by framing Microsoft’s ambition around a single idea: building the open agentic web. Where the original web allowed humans to browse and consume content, and the mobile web put that experience in our pockets, the agentic web will be powered by AI agents that act on our behalf — booking meetings, writing code, conducting research, and orchestrating complex workflows without constant human intervention.
This represents a fundamental architectural shift in how software is built and how users interact with technology.
Key Announcements
1. Windows AI Foundry
Microsoft’s Windows Copilot Runtime has evolved into Windows AI Foundry — a unified platform that supports the complete AI developer lifecycle. It gives developers:
- Quick access to ready-to-use open-source models
- Support across diverse Windows silicon
- Native integration with client and cloud environments
This signals Microsoft’s intent to make Windows the premier development platform for the agentic web.
2. Azure AI Foundry: The Agent Factory
Azure AI Foundry was positioned as “the agent factory” for enterprise AI. Key expansions include:
- Access to 1,900+ AI models from providers including OpenAI, Meta, Mistral, Anthropic, and Black Forest Labs
- A new Model Router that automatically selects the optimal AI model based on cost and quality requirements
- Model Leaderboard for ranking top-performing models
- General Availability of Azure AI Foundry Agent Service, enabling orchestration of multiple specialised agents working in tandem
3. GitHub Copilot Becomes an Autonomous Agent
One of the most applauded announcements was the transformation of GitHub Copilot from a code suggestion tool into a full autonomous coding agent. It can now:
- Open pull requests independently
- Implement features end-to-end
- Add property filters, caching logic, and tests
- Perform refactoring without step-by-step human guidance
GitHub Copilot Chat in VS Code was also announced as open source, inviting community collaboration and transparency.
4. NLWeb: The HTML of the Agentic Web
Microsoft introduced NLWeb, a new open project that enables any website to expose a natural-language conversational interface. Think of it as the tag equivalent for the agentic web — a standard that allows AI agents to interact with any web service in plain language. This is one of the most forward-looking announcements from Build 2025.
5. Model Context Protocol (MCP) — Open Standards Commitment
Microsoft announced first-party support for the Model Context Protocol (MCP) across all major platforms: GitHub, Copilot Studio, Dynamics 365, Azure AI Foundry, Semantic Kernel, and Windows 11. Microsoft also joined the MCP Steering Committee, contributing an updated authorization specification and an MCP server registry design. This commitment to open standards is critical for the multi-vendor, interoperable agentic web.
6. xAI Partnership: Grok on Azure
In a significant industry partnership, Microsoft announced that Grok 3 and Grok 3 Mini from Elon Musk’s xAI are coming to Azure AI Foundry. This expands Microsoft’s model catalogue well beyond OpenAI and signals a platform-agnostic approach to AI infrastructure.
7. WSL Goes Open Source
Windows Subsystem for Linux (WSL) is being made fully open source — a move that deepens Microsoft’s developer credibility and reinforces Windows as the best dev box for the new agentic era.
8. Microsoft Entra Agent ID
To address “agent sprawl” in enterprises, Microsoft introduced Entra Agent ID, which automatically assigns unique identities to agents created in Copilot Studio or Azure AI Foundry. This gives IT administrators visibility and control over every agent operating within their environment.
By the Numbers
Nadella shared impressive adoption metrics that underline how seriously enterprises are embracing Microsoft’s AI ecosystem:
- 15 million developers now use GitHub Copilot
- 230,000+ organisations use Copilot Studio
- 90% of Fortune 500 companies have used Microsoft’s Copilot offerings
Why This Matters
The Build 2025 opening keynote is significant because it reframes the developer’s role entirely. Developers are no longer just writing code — they are orchestrating agents that write code, test it, deploy it, and improve it. The job of the developer in the agentic era is to define intent, set guardrails, and evaluate outcomes.
Microsoft is positioning itself as the infrastructure layer for this entire shift: from Windows to Azure to GitHub to Microsoft 365, every product in the ecosystem is being re-platformed around agents and open standards.
Conclusion
Satya Nadella’s Build 2025 opening keynote was one of the most consequential in Microsoft’s recent history. The convergence of agentic AI, open standards like MCP, massive model choice through Azure, and a developer-first ethos signals that the next generation of software will look radically different — and Microsoft intends to be at the centre of it.
Whether you’re a developer, an enterprise architect, or a technology leader, the age of AI agents is not coming. According to Microsoft: it’s already here.
Watch the full keynote: YouTube — Microsoft Build 2025 | Satya Nadella Opening Keynote
Tags: Microsoft Build 2025, Satya Nadella, AI Agents, Azure AI Foundry, GitHub Copilot, NLWeb, MCP, Windows AI Foundry, Agentic Web
