Microsoft Ships Teams SDK to Make AI Agents Real Workplace Teammates

For most of AI's recent history, agents have lived in sidebars, separate apps, or dedicated chat windows , places users have to go out of their way to find. Microsoft is making a direct bet against that model. Announced at Microsoft Build 2026, the company is shipping a new Teams SDK and developer CLI designed to turn agents into genuine participants in everyday work, not just tools you query on the side.

The friction problem it's solving

Building an agent today can mean juggling registration, credentials, manifest creation, and deployment across multiple tools, slowing developers down before they even get to the interesting work. That setup tax is the core problem the new tooling targets.

• The Teams SDK accelerates the path from idea to working prototype and is now generally available in Python, JavaScript, and C#.
• The Teams developer CLI helps automate setup tasks like app registration and configuration, reducing context switching and repetitive work.
• The CLI is a text-based command line interface that can help scaffold, validate, and deploy applications for Microsoft 365 from the terminal or a CI/CD process.
• The Microsoft 365 Agents Toolkit for Visual Studio Code enables you to scaffold, run, debug, and deploy custom Teams apps directly from Visual Studio Code.

You can install the CLI with a single npm command and get scaffolding, manifest wiring, and deployment in one place:

npm install -g @microsoft/m365agentstoolkit-cli
atk -h

Agents that actually feel like teammates

The SDK is not just a deployment wrapper. It introduces a set of new interaction primitives that change what agents can actually do inside a conversation.

Agents can now have 1:1 interactions with individuals in a group setting through targeted messages , for example, an agent can message an individual user in a Teams channel if they need access to a tool to complete a task, without cluttering an ongoing conversation. Think of it as a private whisper inside a public room.