Allison summarizes the September 2025 Visual Studio update, showcasing new GitHub Copilot features such as Profiler and .NET Modernization agents, improved MCP prompts, and advanced code review tools.

GitHub Copilot Updates in Visual Studio — September 2025 Release

Author: Allison

The September 2025 update to Visual Studio 2022 introduces a host of new and improved GitHub Copilot features aimed at boosting developer productivity and streamlining modernization and code analysis workflows.

What’s New with GitHub Copilot in Visual Studio 2022 (v17.14)

Profiler Agent

  • Quickly identify and resolve performance bottlenecks in your code.
  • Use Copilot Chat with the @Profiler prompt to receive AI-powered performance analysis, actionable fixes, and benchmarking guidance in an interactive loop.

.NET Modernization Agent

  • Simplify upgrading .NET projects to the latest versions and facilitate seamless migrations to Azure.
  • Modernize projects quickly via right-click options or the @Modernize prompt in Copilot Chat.

Agent Mode Improvements

  • Experience faster response times, improved file management, and enhanced control over Copilot interactions.
  • More stable and fluid agent workflows updated regularly.

MCP Prompts, Resources, and Sampling

  • Take advantage of extended model customization with improved MCP prompts, more contextual resources, and flexible agentic sampling to tailor your AI development experience.

Mermaid Diagram Support

  • Automatically generate and preview Mermaid diagrams representing workflows and data structures within your Markdown editor using Copilot.

Smarter Code Reviews

  • Leverage enhanced code review tools with better local reasoning, insightful comments, and custom instruction support for tailored feedback during code reviews.

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