Microsoft
Developer Blogs

Get the latest information, insights, and news from Microsoft.

Highlights

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.
Read moreClick to read more about this post

Latest posts

Jul 13, 2026
Post comments count0
Post likes count0

The Visual Studio Dev/Test Benefit: Freedom to Build, Test, and Experiment in Azure

James Rempt
One of the best parts of a Visual Studio Subscription is discovering benefits that can make your day-to-day development work easier and more cost effective. One benefit that deserves more attention is Azure Dev/Test pricing. In fact, it's one of the most valuable benefits...
Visual Studio Blog
Jul 13, 2026
Post comments count4
Post likes count3

Why don't we just make the entire stack out of guard pages?

Raymond Chen
Guard pages all the way down?
The Old New Thing
Jul 10, 2026
Post comments count0
Post likes count0

Go 1.26.5-2 Microsoft build now available

Davis Goodin
A new release of the Microsoft build of Go is now available for download.
Microsoft for Go Developers
Jul 10, 2026
Post comments count3
Post likes count2

The case of the mysterious changes to integers when there shouldn't have been any code generation effect

Raymond Chen
Decoding where those integer came from.
The Old New Thing
Jul 10, 2026
Post comments count0
Post likes count3

Shrinking Azure Pipeline task extensions using esbuild

David Paquette
TL;DR We bundled an internal Azure Pipelines task extension into a single bundled JavaScript file using esbuild. The task package dropped from tens of megabytes and thousands of files to three files per task ( script.js ,  task.json , and  icon.png ). The change took about 20 lines...
Azure DevOps Blog
Jul 10, 2026
Post comments count0
Post likes count0

Microsoft Agent Framework for Go public preview

Quim Muntal
Microsoft Agent Framework for Go is entering public preview, bringing Agent Framework concepts to Go developers building agents and multi-agent workflows.
Microsoft for Go Developers
Jul 9, 2026
Post comments count0
Post likes count0

Pure Virtual C++ 2026 [Meet the Speakers, Part 1]: Build Faster, Run Faster

Marian Luparu
Meet the speakers behind Pure Virtual C++ 2026. In part one, Ryan Shepherd and David Li show how to build faster and smaller with C++20 modules and GitHub Copilot build performance.
C++ Team Blog
Jul 9, 2026
Post comments count8
Post likes count4

Modernize .NET applications in the GitHub Copilot app

Mika Dumont
Modernize .NET applications in the GitHub Copilot app. Follow your upgrade from assessment through execution in an interactive upgrade canvas.
.NET Blog
Jul 9, 2026
Post comments count0
Post likes count5

SharePoint Copilot Apps Now in Public Preview: From Intent to Action in Microsoft 365 Copilot

Vesa Juvonen
SharePoint Copilot Apps are now in public preview, introducing a new way to bring guided, action-oriented business experiences into Microsoft 365 Copilot. By combining natural language reasoning with structured UX, validation, permissions, and deterministic operations, organizations can help users move from intent to trusted outcomes directly in the Copilot flow.
Microsoft 365 Developer Blog