JetBrains Rider 2025.2: AI coding agent Junie runs faster and uses MCP

The software company JetBrains has updated its .NET and game development IDE Rider with version 2025.2, as well as the Visual Studio extension ReSharper and the .NET tools. A faster version of the AI coding agent Junie is now available as a beta in Rider, while ReSharper now enables out-of-process mode, among other things.

Heise conference on .NET 10.0 - All new features at a glance

Improved classes in .NET 10.0, Native AOT with Entity Framework Core 10.0 and more: The online conference betterCode() .NET 10.0 on November 18, 2025 will provide information on these topics, followed by six full-day workshops on topics such as C# 14.0, the use of AI and web APIs.

Coding with AI for .NET developers

In the new release, the AI coding agent Junie should be up to 30 percent faster, be able to handle remote development, and have deeper context awareness thanks to the Model Context Protocol (MCP). In addition, developers in the early access program can connect Junie to GitHub to manage pull requests without having to open the IDE.

According to JetBrains, Junie is suitable for complex development tasks. The “Ask” mode allows high-level brainstorming, while the “Code” mode is responsible for hands-on implementation. Junie can write and refactor code, generate files, and run tests. However, the developers should remain in control.

Details on these and other changes in Rider 2025.2 can be found on the JetBrains blog.

ReSharper allows out-of-process mode

One of the highlights in ReSharper 2025.2 is the out-of-process (OOP) mode. This means that ReSharper can run in a separate process from Visual Studio, which should increase stability and pave the way for future performance improvements.

Developers switch to OOP mode by going to Options | Environment | Products & Features in ReSharper and activating the “Run ReSharper in separate process” option. Click on the Save and restart button to apply the change.

ReSharper should also bring noticeable performance improvements, including Rename and inline refactoring as well as Razor/Blazor processing. Support for the latest features of the C# 14.0 language version, which Microsoft expects to release in November 2025, is now also included.

Further information on the updates in ReSharper as well as in the .NET tools dotTrace, dotMemory, and dotCover in version 2025.2 can be found on the JetBrains blog.

(mai)