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Every CCA PR was created at the explicit request of a human with maintainer rights to the repository; CCA cannot open PRs on its own. dotnet/runtime is an open-source project with significant community contributions, and the table above reflects the full PR population. “Microsoft” vs “Community” is determined by users listing Microsoft/MSFT in their public GitHub profile, which likely undercounts

Windows 95 defenses against installers that overwrite a file with an older version Back in the days of 16-bit Windows, many system components were redistributable, meaning that programs that used those components could include a copy of those system components and install them onto the system as part of the program’s installer. The guidance for installing the system components was that if the inst

Today we are excited to announce the availability of TypeScript 6.0! If you are not familiar with TypeScript, it’s a language that builds on JavaScript by adding syntax for types, which enables type-checking to catch errors, and provide rich editor tooling. You can learn more about TypeScript and how to get started on the TypeScript website. But if you’re already familiar with the language, you ca

Today we are excited to announce the Release Candidate (RC) of TypeScript 6.0! To get started using the RC, you can get it through npm with the following command: npm install -D typescript@rc TypeScript 6.0 is a unique release in that we intend for it to be the last release based on the current JavaScript codebase. As announced last year (with recent updates here), we are working on a new codebase

This guide covers setting up Claude Code CLI and VS Code extension with Microsoft Foundry, configuring CLAUDE.md for project context, integrating Spec Kit for structured development, and running Claude Code in GitHub Actions. Prerequisites Azure subscription with Foundry access Node.js 18+ (for Claude Code CLI) Optional: Azure CLI installed (az login completed) Step 1: Deploy Claude Models in Foun

Overhead + Complexity = Time Overhead is unavoidable. There is some level inherent in every product construction process. However, when we add complexity to our product construction processes, especially complexity in the graph, the overhead tends to begin to dominate the process. It sort of multiplies. Rather than paying the machine queue time cost one time, you might pay it 10 times over within

Today, we are excited to announce the launch of .NET 10, the most productive, modern, secure, intelligent, and performant release of .NET yet. It’s the result of another year of effort from thousands of developers around the world. This release includes thousands of performance, security, and functional improvements across the entire .NET stack-from languages and developer tools to workloads-enabl

Dear developers, We’re thrilled to announce that Visual Studio 2026 is now generally available! This is a moment we’ve built side by side with you. Your feedback has helped shape this release more than any before. Since the introduction of the Insiders Channel in September, more developers have downloaded and tested this preview than any other in Visual Studio’s history. In the year leading up to

Create the future Securely design, customize, and manage AI applications and agents at scale with Microsoft Foundry. Get started Why agents need a new foundation Over the last year, developers have been experimenting with AI agents in every imaginable form. Agents are not just chatbots or copilots — they are autonomous software components that can reason about goals, call tools and APIs, collabora

Building AI agents shouldn’t be rocket science. Yet many developers find themselves wrestling with complex orchestration logic, struggling to connect multiple AI models, or spending weeks building hosting infrastructure just to get a simple agent into production. What if building an AI agent could be as straightforward as creating a web API or console application? Agents and Workflows Before we di

dotnet/runtime#110827 from @hez2010 also helps more methods to be inlined by doing another pass looking for opportunities after later phases of devirtualization. The JIT’s optimizations are split up into multiple phases; each phase can make improvements, and those improvements can expose additional opportunities. If those opportunities would only be capitalized on by a phase that already ran, they

Today we are excited to announce the availability of TypeScript 5.9 Beta. To get started using the beta, you can get it through npm with the following command: npm install -D typescript@beta Let’s take a look at what’s new in TypeScript 5.9! Minimal and Updated tsc --init Support for import defer Support for --module node20 Summary Descriptions in DOM APIs Expandable Hovers (Preview) Configurable

Today we’re excited to announce the launch of the Awesome GitHub Copilot Customizations repo! The Awesome Copilot repo is a community-driven resource with custom instructions, reusable prompts, and custom chat modes that helps you get consistent AI assistance. In other words, Awesome Copilot helps you get the most out of GitHub Copilot by letting you tailor it to your needs. And even better, the a

Copilot agent mode is the next evolution in AI-assisted development—and it’s now generally available in the Visual Studio June update. Agent mode turns GitHub Copilot into an autonomous pair programmer capable of handling multi-step development tasks from end to end. It builds a plan, executes it, adapts along the way, and loops through tasks until completion. Agent mode can analyze your codebase,

.NET 10 is now available: the most productive, modern, secure, intelligent, and performant release of .NET yet. Managing logs in production environments involves tricky trade-offs. You want detailed logs when things go wrong, but you don’t want to pay storage costs for logs that never get examined. While log sampling helps reduce log volume by emitting only a percentage of logs, sometimes you need

.NET 10 is now available: the most productive, modern, secure, intelligent, and performant release of .NET yet. We are super excited to introduce a new feature that was released as part of .NET 10 Preview 4 that makes getting started with C# easier than ever. You can now run a C# file directly using dotnet run app.cs. This means you no longer need to create a project file or scaffold a whole appli

What is Edit? Edit is a new command-line text editor in Windows. Edit is open source, so you can build the code or install the latest version from GitHub! This CLI text editor will be available to preview in the Windows Insider Program in the coming months. After that, it will ship as part of Windows 11! How to use Edit Open Edit by running edit in the command line or running edit <your-file-name>

.NET 10 is now available: the most productive, modern, secure, intelligent, and performant release of .NET yet. C# 14 introduces extension members. C# has long had extension methods and the new extension member syntax builds on this familiar feature. The latest preview adds static extension methods and instance and static extension properties. We’ll release more member kinds in the future. Extensi

We’re pleased to announce that one of the latest additions to the list of official WSL distros is Fedora Linux! The Fedora Project has taken advantage of WSL’s new tar-based architecture to produce WSL images beginning with Fedora 42. Try it out To install it, run wsl –-install FedoraLinux-42and then launch it with wsl –d FedoraLinux-42. You’ll be prompted for a username, and then you’ll be ready

OpenAI’s gpt-4o-audio-preview is a powerful multimodal model that enables audio input and output capabilities, allowing developers to create more natural and accessible AI interactions. This model supports both speech-to-text and text-to-speech functionalities in a single API call through the Chat Completions API, making it suitable for building voice-enabled applications where turn-based interact

Over the past 5 years, we’ve had many incredible opportunities to engage with game developers. From AAA studios to indie developers, the passion for slashing iteration times is significant. Amidst all the fantastic feedback we’ve received for Visual Studio, one sentiment has rung loud and clear: a desire to debug optimized C++ code without sacrificing performance. Although game developers have voi