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Not all model upgrades are upgrades

A new model drops with lower per-token pricing and better benchmarks. You switch. A week later someone asks why the agent is burning 12x more tokens on the same task while producing worse output. We ran 150 agent tasks across 15 scenarios on two models, Claude Sonnet 4.6 and Claude...
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Jul 10, 2026
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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
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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
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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
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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
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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
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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
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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
Jul 9, 2026
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I've decoded a #pragma detect_mismatch error and fixed the mismatch, but I still get the error

Raymond Chen
You need to rebuild everything that was dependent on the change.
The Old New Thing
Jul 9, 2026
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Agent Harness: Scaling the claw or harness capabilities

Wes Steyn
Part 3 of Build your own claw and harness with Microsoft Agent Framework. In Part 2 our personal finance assistant learned to work with your data safely: it reads your portfolio, asks before it trades, and remembers what matters across sessions. It's useful - but everything it knows is...
Microsoft Agent Framework
Jul 9, 2026
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What's New in vcpkg (June 2026)

Augustin Popa
These June updates add a vcpkg-tool switch to skip installation when packages are already cached, OpenHarmony (OHOS) platform support, and major library updates including curl 8.21, CGAL 6.2, and Graphviz 15.
C++ Team Blog
Jul 9, 2026
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From Noisy Queries to Precise Frames: Query Decomposition for Media Asset Search

Kartheek,
Deeptanil
How query decomposition separates metadata filters from visual intent to significantly improve media asset retrieval quality.
ISE Developer Blog
Jul 8, 2026
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Visual Studio Code 1.129 (Insiders)

Visual Studio Code Team
Learn what's new in Visual Studio Code 1.129 (Insiders) Read the full article
VS Code Blog
Jul 8, 2026
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Visual Studio Code 1.128

Visual Studio Code Team
Learn what's new in Visual Studio Code 1.128 Read the full article
VS Code Blog
Jul 8, 2026
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Go 1.26.5-1 and 1.25.12-1 Microsoft builds now available

Davis Goodin
A new release of the Microsoft build of Go including security fixes is now available for download.
Microsoft for Go Developers
Jul 8, 2026
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Let’s Learn GitHub Copilot App - Free Virtual Training Event

Katie Savage
Join us for a free online event series kicking off July 16 to learn how to get started with the GitHub Copilot App!
Microsoft for Developers
Jul 8, 2026
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Announcing TypeScript 7.0

Daniel Rosenwasser
Today we are proud to announce the availability of TypeScript 7, a 10x faster native port of TypeScript! Since its early days, TypeScript has promised to deliver on JavaScript that scales. By bringing strong type-checking and rich tooling to the world of JavaScript, TypeScript made it...
TypeScript
Jul 8, 2026
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Building on Vercel's eve + Azure Cosmos DB: An Agent That Remembers

Sajeetharan Sinnathurai
Most "AI agent" demos forget everything the moment the process exits. That's fine for a toy project, but useless for anything real. An agent that helps you write, triage, or support needs two things a language model alone can't give it: durable state and the ability to recall the right...
Azure Cosmos DB Blog
Jul 8, 2026
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The other kind of control flow guard check: The combined validate and call

Raymond Chen
A two-in-one package.
The Old New Thing