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How to test agent skills without hitting real APIs

Your agent skill calls an API. The moment you start evaluating it, every run either costs money or mutates production data. Learn how to mock APIs transparently so you can run evals without changing your skill or hitting real endpoints.
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Jun 29, 2026
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Packaging and Package Identity for .NET apps with WinApp CLI on Windows

Zachary Teutsch
Use the WinApp CLI to add identity to and package .NET desktop applications, enabling deeper integration to Windows and easier distribution.
.NET Blog
Jun 29, 2026
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WSL container is now available for public preview

Craig Loewen
At Microsoft Build 2026, we introduced WSL containers, bringing Linux container development directly into Windows through the Windows Subsystem for Linux (WSL). Containers have become a foundational part of modern development - from cloud-native applications and AI workloads to testing...
Windows Command Line
Jun 29, 2026
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Automating your Visual Studio extension builds with GitHub Actions

Mads Kristensen
If you’re building and maintaining Visual Studio extensions, you’ve probably ended up with some sort of build and publishing workflow - whether it’s manual, scripted, or stitched together over time. This post is for extension authors who want a simple, repeatable way to build,...
Visual Studio Blog
Jun 29, 2026
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The evolution of window and class extra bytes in Windows

Raymond Chen
The intended usage is encoded in the prefix.
The Old New Thing
Jun 29, 2026
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Agent Harness: Working with your data, safely

Wes Steyn
Part 2 of Build your own claw and agent harness with Microsoft Agent Framework. In Part 1 we stood up a harness and gave our personal finance assistant its first abilities: a custom tool, web search, and planning. It can talk about the markets - but it can't yet touch your data, and...
Microsoft Agent Framework
Jun 29, 2026
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Remote Event Receivers are retiring: move to SharePoint webhooks before July 1, 2027

SharePoint team
Remote Event Receivers in SharePoint Online are retiring. Starting July 1, 2027, all remote event receivers will stop firing events, including those registered using Microsoft Entra applications.
Microsoft 365 Developer Blog
Jun 29, 2026
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Spring AI 2.0 is GA: Vector Search, Memory, and Agents on Azure Cosmos DB

Theo van Kraay
The wait is over. Spring AI 2.0 is generally available, and Azure Cosmos DB is right there with it. With this release, Spring AI graduates into a mature, production-ready framework for building AI applications in Java, and Azure Cosmos DB ships dedicated, vendor-maintained...
Azure Cosmos DB Blog
Jun 26, 2026
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Azure Developer CLI (azd) - May and June 2026

Kristen Womack
A combined May and June recap. A new azd tool command group, the cross-platform azd exec runner, safer multi-layer provisioning, an interactive Ctrl+C cancel prompt, Go support for Azure Functions, self-contained extension bundles, per-tenant subscription filters, and a long list of correctness fixes for parallel Container Apps deploys and authentication.
Azure SDK Blog
Jun 26, 2026
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The case of the DLL that was not present in memory despite not being formally unloaded, part 2

Raymond Chen
Tying two bugs together.
The Old New Thing