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Microsoft Build 2026: What It Means When Your Document Workflows Become Tools an Agent Can Call

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Microsoft Build 2026 runs June 2-3 at the Fort Mason Center in San Francisco, and it is a hybrid event: in-person seats are limited and ticketed, but the keynotes and selected sessions stream free online, so you can follow along from anywhere at no cost. It is a deliberately smaller event this year, around 2,500 in-person seats, and Microsoft has been explicit about the framing: two days, real code, real systems, no fluff. For a team that ships .NET libraries used in production document pipelines, that is exactly the kind of Build worth paying attention to.

Last year's Build was about announcing the agentic web. This year is about running it in production. If you build with IronPDF, IronOCR, or IronXL, that shift changes where your libraries sit in the architecture, and it is worth understanding before the keynote.

The throughline is agents, and it reaches further than it did in 2025

Every track at Build 2026 connects back to one theme: agents moving from demonstration to deployment. The 2025 conference established the protocols. Model Context Protocol, agent-to-agent communication, and the first managed agent runtimes all landed there. In the months since, those pieces have hardened. The Foundry MCP server is now a hosted, fully managed endpoint rather than a local experiment. Multi-agent orchestration, long-term agent memory, and an agent-to-agent tool have all moved into preview or general availability. Build 2026 is where that maturation gets the stage.

The detail that matters most for our customers is quieter than the keynote headlines: Foundry now lets you expose any API or function as an MCP tool, alongside more than 1,400 connectors to business systems. Agents are increasingly assembled from callable tools rather than written as monolithic code. That architectural choice is the reason Build 2026 is directly relevant to anyone generating or reading documents in .NET.

Why this matters if you build with Iron Software

An agent is good at reasoning over ambiguity and bad at producing a byte-exact PDF, a correctly structured spreadsheet, or reliable text extraction from a scanned invoice. Those are deterministic problems. You do not want a language model improvising the layout of a compliance report or guessing at the totals in an extracted table.

This is precisely the boundary the agentic tooling model draws. The agent decides what needs to happen and when. The tool does the deterministic work and returns a predictable result. Document generation, OCR, and spreadsheet manipulation are textbook deterministic tools, which means a library like IronPDF or IronOCR is a natural fit for the MCP tool slot in an agent workflow. The agent calls the tool, the tool produces the artifact, and the output is the same every time.

A few things at Build 2026 are worth watching through that lens:

  • Foundry agent service and MCP tools. Expect deeper guidance on building and registering custom tools. An IronOCR step that pulls structured data from a document, or an IronPDF step that renders a finished report, drops cleanly into this pattern as a callable, governed tool.
  • Multi-agent orchestration and agent-to-agent handoffs. As workflows span several agents, the document step becomes a reliable, reusable node that any agent in the pipeline can invoke without reinventing it.
  • The Responsible AI track. Microsoft is giving this its own track for the first time. The practical guidance here — validate tool outputs, keep a human in the loop for side-effecting actions, treat retrieved content as untrusted — maps directly onto regulated document workflows in healthcare, finance, and legal, where Iron libraries already do a lot of the heavy lifting.
  • On-device and Windows AI. The continued push toward local inference lines up with the offline and edge scenarios where IronOCR and IronPDF already run without a cloud round trip.

We have spent years making document generation and OCR behave predictably under production load, the exact property an autonomous agent needs from the tools it depends on. You can put that reliability behind an MCP tool in an afternoon: wire IronOCR into an extraction step or IronPDF into a render step, register it, and let your agent call it. Same input, same output, every time.

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How to watch

The opening keynote with Satya Nadella and Microsoft and GitHub engineering leaders streams free online starting June 2, and you do not need an in-person ticket to follow the parts that matter. If your roadmap includes agents touching documents this year, the Agents and Apps and Azure AI Foundry tracks are where the actionable material will be. We will be following both closely and applying what lands to IronPDF, IronOCR, IronXL, and the rest of the suite.

See you at Build.