Anastasia Kazakova retweeted
We connected IntelliJ IDEA’s code intelligence to Claude Code and Codex, then tested the setup with Netflix.
The first public results are out.
Typical efficiency gains: 20–30%.
Best code-navigation case: ~65%.
These results come from two real codebases. The efficiency metric averages token savings and time savings.
Correctness stayed stable or improved.
Here’s what we actually built.
The code engine behind IntelliJ IDEA ran headlessly, giving agents access to its capabilities through a CLI backed by a daemon.
LSP alone wasn’t sufficient.
Agents needed a convenient way to invoke the tools. The backend also needed to stay running and keep the project index warm between calls.
The idea is straightforward.
An IDE has already mapped the structure of your code and its dependencies — including what’s inside compiled libraries.
An agent can use that knowledge instead of spending time and tokens reconstructing it.
But the most interesting finding was which models benefited most.
The strongest models saw the biggest gains.
Especially at higher reasoning effort.
In these experiments, more capable models were also better at taking advantage of code intelligence.
My takeaway: better models and better tools aren’t competing bets.
You don’t have to choose between investing in model intelligence and giving agents better access to your codebase.
The two can reinforce each other.
Huge thanks to @pbakker and the Netflix team for working with us on this!
The first public results are out.
Typical efficiency gains: 20–30%.
Best code-navigation case: ~65%.
These results come from two real codebases. The efficiency metric averages token savings and time savings.
Correctness stayed stable or improved.
Here’s what we actually built.
The code engine behind IntelliJ IDEA ran headlessly, giving agents access to its capabilities through a CLI backed by a daemon.
LSP alone wasn’t sufficient.
Agents needed a convenient way to invoke the tools. The backend also needed to stay running and keep the project index warm between calls.
The idea is straightforward.
An IDE has already mapped the structure of your code and its dependencies — including what’s inside compiled libraries.
An agent can use that knowledge instead of spending time and tokens reconstructing it.
But the most interesting finding was which models benefited most.
The strongest models saw the biggest gains.
Especially at higher reasoning effort.
In these experiments, more capable models were also better at taking advantage of code intelligence.
My takeaway: better models and better tools aren’t competing bets.
You don’t have to choose between investing in model intelligence and giving agents better access to your codebase.
The two can reinforce each other.
Huge thanks to @pbakker and the Netflix team for working with us on this!
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Anastasia Kazakova retweeted
The #UEFN #UnrealEngine Verse language support just shipped in @JetBrainsRider 2026.3 Early Access. Even AI agents would appreciate a stable tool with FindUsages and Rename refactoring exposed by Rider MCP. Has to be installed as a plugin. plugins.jetbrains.com/plugin/34352-v…
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Anastasia Kazakova retweeted
We've reimagined JetBrains IDEs to become the ultimate agentic workbench.
Air is an open hub for agents inside your IDE:
-Any agents to run (Claude, Codex & many more)
-Agents are more efficient with IDE intelligence
-Free Junie Lite agent bundled
-Cloud runs via Air Teams
⬇️
Air is an open hub for agents inside your IDE:
-Any agents to run (Claude, Codex & many more)
-Agents are more efficient with IDE intelligence
-Free Junie Lite agent bundled
-Cloud runs via Air Teams
⬇️
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Anastasia Kazakova retweeted
Today we introduce JetBrains Air - the product system for software development orgs in the age of agents.
Built for developers, team leads & engineering directors.
Open and flexible: steer and control almost any LLM & harness.
Read more:
jb.gg/air-announce
Built for developers, team leads & engineering directors.
Open and flexible: steer and control almost any LLM & harness.
Read more:
jb.gg/air-announce
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If you ask me what is my favourite moment at #UnrealFest26 so far, this!
Look who joined us at Unreal Fest Chicago! 👀
Want to hear Homer talk about Rider, @teamcity, AI, and how smoothly they work with @UnrealEngine, @unity, @godotengine, or your own custom engine?
No promises he’ll be at the booth, but we’ll do our best. Come say hi! 👋
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Anastasia Kazakova retweeted
Rider 2026.2 EAP 5 is out with something BIG 🔥
This build introduces bundled quality-check hooks for external AI agents, starting with Claude Code and Codex.
A hook is an automated step that runs at a specific point in the agent’s process. Here, Rider uses a 'PostToolUse' its a file, Rider automatically runs IDE-level validation before the agent continues.
This means agent-generated code is no longer just accepted as-is. Errors block the agent from treating the task as complete 🫷, while warnings and other findings are returned as feedback the agent can use to fix its own output ✅
Raise the bar on the quality of your AI-generated code with Rider 2026.2 EAP 5. Available from our website NOW.
This build introduces bundled quality-check hooks for external AI agents, starting with Claude Code and Codex.
A hook is an automated step that runs at a specific point in the agent’s process. Here, Rider uses a 'PostToolUse' its a file, Rider automatically runs IDE-level validation before the agent continues.
This means agent-generated code is no longer just accepted as-is. Errors block the agent from treating the task as complete 🫷, while warnings and other findings are returned as feedback the agent can use to fix its own output ✅
Raise the bar on the quality of your AI-generated code with Rider 2026.2 EAP 5. Available from our website NOW.
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Anastasia Kazakova retweeted
AI-generated tests are only as good as the context you give the model.
And this is where I think IDEs have a big advantage.
I use JetBrains tools daily. ReSharper is always part of my .NET workflow, and one of the reasons I like these tools is that they already understand a lot e AI enters the picture.
That’s why I found this new Rider EAP feature interesting.
In Rider 2026.2 EAP, JetBrains is introducing a bundled AI agent skill called finding-tests.
@jetbrains says this approach can reduce token consumption by up to 50% in their internal benchmarks, mostly using Claude. That means lower AI costs, or more useful work from the AI quota you already have.
The idea is simple: instead of asking an AI agent to blindly search your codebase and guess where a test should go, Rider runs dotCover coverage analysis to map the existing tests around the C# code you’re working on.
It can then point the agent to a relevant test file, where it can read nearby tests and follow the project’s existing style.
That matters because most real-world .NET projects already have a testing style.
Maybe you use xUnit fixtures.
Maybe you have custom builders.
Maybe your tests follow a very specific naming convention.
Maybe there’s already a test class nearby that the AI should extend instead of inventing something new.
The more the AI has to discover this on its own, the more tokens you burn. And the more likely it is to produce something that technically compiles, but doesn’t really fit your project.
The trade-off is that Rider has to run the tests needed for dotCover to build this map. If you enable it for an entire solution, that means running the existing tests across that solution.
On a small project, that might be around 30 seconds. On a large enterprise solution, it can be much longer. So this won’t be the right default for everyone. You can disable the skill globally or per project.
Also, obvious but important: AI-generated tests still need review. Tests can introduce bad assumptions, weak assertions, or weird side effects. Don’t commit them just because they were generated.
The EAP is free to try, even without the dotUltimate license normally required for dotCover inside Rider.
Learn more here: blog.jetbrains.com/dotnet/2026/05…
Worth testing if you care about better AI-generated tests, lower AI costs, and IDE-native context.
And this is where I think IDEs have a big advantage.
I use JetBrains tools daily. ReSharper is always part of my .NET workflow, and one of the reasons I like these tools is that they already understand a lot e AI enters the picture.
That’s why I found this new Rider EAP feature interesting.
In Rider 2026.2 EAP, JetBrains is introducing a bundled AI agent skill called finding-tests.
@jetbrains says this approach can reduce token consumption by up to 50% in their internal benchmarks, mostly using Claude. That means lower AI costs, or more useful work from the AI quota you already have.
The idea is simple: instead of asking an AI agent to blindly search your codebase and guess where a test should go, Rider runs dotCover coverage analysis to map the existing tests around the C# code you’re working on.
It can then point the agent to a relevant test file, where it can read nearby tests and follow the project’s existing style.
That matters because most real-world .NET projects already have a testing style.
Maybe you use xUnit fixtures.
Maybe you have custom builders.
Maybe your tests follow a very specific naming convention.
Maybe there’s already a test class nearby that the AI should extend instead of inventing something new.
The more the AI has to discover this on its own, the more tokens you burn. And the more likely it is to produce something that technically compiles, but doesn’t really fit your project.
The trade-off is that Rider has to run the tests needed for dotCover to build this map. If you enable it for an entire solution, that means running the existing tests across that solution.
On a small project, that might be around 30 seconds. On a large enterprise solution, it can be much longer. So this won’t be the right default for everyone. You can disable the skill globally or per project.
Also, obvious but important: AI-generated tests still need review. Tests can introduce bad assumptions, weak assertions, or weird side effects. Don’t commit them just because they were generated.
The EAP is free to try, even without the dotUltimate license normally required for dotCover inside Rider.
Learn more here: blog.jetbrains.com/dotnet/2026/05…
Worth testing if you care about better AI-generated tests, lower AI costs, and IDE-native context.
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This is huge! Up until now, Visual Studio seemed to be locked to Copilot agent exclusively. We wanna change that and bring any ACP-compatible agent to it. First is Junie, to run the proof-of-concept and validate your interest (fill in the survey).
ReSharper 2026.2 EAP 1 is out with some Big News!
This preview introduces Junie, JetBrains’ LLM-agnostic AI agent, as the first step toward bringing more AI agents into Microsoft Visual Studio ⛓️💥
Learn more and give it a try: jb.gg/rs-junie-acp-i…
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Anastasia Kazakova retweeted
𝗖# 𝗶𝗻 𝗩𝗦 𝗖𝗼𝗱𝗲 𝗮𝗹𝘄𝗮𝘆𝘀 𝗳𝗲𝗹𝘁 𝗯𝗿𝗼𝗸𝗲𝗻.
In March, this finally changed 👇
What's the problem with C# in VS Code?
You open your .NET solution in VS Code, Cursor, or another lightweight editor.
You get basic syntax highlighting. Some IntelliSense. Maybe a few al productivity? That's been missing.
Here is what I kept running into:
• Weak code analysis that misses real issues
• Limited refactoring support
• Limited Solution Explorer
• No reliable navigation to decompiled sources
• No built-in unit test runner
• AI-generated code with no quality layer on top
For years, the only real options were:
❌ Use a full IDE like Visual Studio or Rider
❌ Piece together multiple VS Code extensions and hope they work
This changed in March.
JetBrains officially released 𝗥𝗲𝗦𝗵𝗮𝗿𝗽𝗲𝗿 for VS Code, Cursor, and Google Antigravity: jetbrains.com/resharper/?pro…
This is the same ReSharper engine that millions of developers have trusted in Visual Studio for 20+ years, now running in VS Code, Cursor, and Google Antigravity.
𝗔𝗻𝗱 𝗵𝗲𝗿𝗲'𝘀 𝘁𝗵𝗲 𝗯𝗲𝘀𝘁 𝗽𝗮𝗿𝘁: 𝗶𝘁'𝘀 𝗙𝗥𝗘𝗘 𝗳𝗼𝗿 𝗻𝗼𝗻-𝗰𝗼𝗺𝗺𝗲𝗿𝗰𝗶𝗮𝗹 𝘂𝘀𝗲, 𝘀𝘁𝘂𝗱𝘆𝗶𝗻𝗴, 𝗮𝗻𝗱 𝗵𝗼𝗯𝗯𝘆 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀.
Here is what made a real difference for me:
1️⃣ Professional-grade code analysis
↳ Real-time inspections and quick-fixes for C#, Razor, Blazor, and XAML. It catches issues that basic extensions completely miss.
2️⃣ Smart coding assistance
↳ Context-aware completion, auto-imports, live templates, and inline documentation that go way beyond what a standard editor offers.
3️⃣ Solution Explorer inside VS Code
↳ A central hub for managing files, folders, NuGet packages, and projects across your entire solution. Just like in Rider or Visual Studio.
4️⃣ Refactoring you can trust
↳ Rename works across your whole solution while safely handling conflicts and references. No more search-and-replace guessing.
5️⃣ Fast navigation to any source
↳ Jump to symbols, usages, files, and types. When source code is not available, ReSharper decompiles assemblies and takes you directly to the declaration.
6️⃣ Built-in unit testing
↳ Run and manage tests for NUnit, xUnit .net, and MSTest directly in your editor with easy navigation to failing tests.
The next major area of focus for ReSharper for VS Code is debugging support.
JetBrains is actively working on support for launching debugging sessions and attaching to processes in .NET and .NET Framework applications.
👉 You can install ReSharper in the Extensions view of your editor (VS Code, Cursor, and Google Antigravity)
——
Many thanks to @jetbrains for sponsoring this post
In March, this finally changed 👇
What's the problem with C# in VS Code?
You open your .NET solution in VS Code, Cursor, or another lightweight editor.
You get basic syntax highlighting. Some IntelliSense. Maybe a few al productivity? That's been missing.
Here is what I kept running into:
• Weak code analysis that misses real issues
• Limited refactoring support
• Limited Solution Explorer
• No reliable navigation to decompiled sources
• No built-in unit test runner
• AI-generated code with no quality layer on top
For years, the only real options were:
❌ Use a full IDE like Visual Studio or Rider
❌ Piece together multiple VS Code extensions and hope they work
This changed in March.
JetBrains officially released 𝗥𝗲𝗦𝗵𝗮𝗿𝗽𝗲𝗿 for VS Code, Cursor, and Google Antigravity: jetbrains.com/resharper/?pro…
This is the same ReSharper engine that millions of developers have trusted in Visual Studio for 20+ years, now running in VS Code, Cursor, and Google Antigravity.
𝗔𝗻𝗱 𝗵𝗲𝗿𝗲'𝘀 𝘁𝗵𝗲 𝗯𝗲𝘀𝘁 𝗽𝗮𝗿𝘁: 𝗶𝘁'𝘀 𝗙𝗥𝗘𝗘 𝗳𝗼𝗿 𝗻𝗼𝗻-𝗰𝗼𝗺𝗺𝗲𝗿𝗰𝗶𝗮𝗹 𝘂𝘀𝗲, 𝘀𝘁𝘂𝗱𝘆𝗶𝗻𝗴, 𝗮𝗻𝗱 𝗵𝗼𝗯𝗯𝘆 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀.
Here is what made a real difference for me:
1️⃣ Professional-grade code analysis
↳ Real-time inspections and quick-fixes for C#, Razor, Blazor, and XAML. It catches issues that basic extensions completely miss.
2️⃣ Smart coding assistance
↳ Context-aware completion, auto-imports, live templates, and inline documentation that go way beyond what a standard editor offers.
3️⃣ Solution Explorer inside VS Code
↳ A central hub for managing files, folders, NuGet packages, and projects across your entire solution. Just like in Rider or Visual Studio.
4️⃣ Refactoring you can trust
↳ Rename works across your whole solution while safely handling conflicts and references. No more search-and-replace guessing.
5️⃣ Fast navigation to any source
↳ Jump to symbols, usages, files, and types. When source code is not available, ReSharper decompiles assemblies and takes you directly to the declaration.
6️⃣ Built-in unit testing
↳ Run and manage tests for NUnit, xUnit .net, and MSTest directly in your editor with easy navigation to failing tests.
The next major area of focus for ReSharper for VS Code is debugging support.
JetBrains is actively working on support for launching debugging sessions and attaching to processes in .NET and .NET Framework applications.
👉 You can install ReSharper in the Extensions view of your editor (VS Code, Cursor, and Google Antigravity)
——
Many thanks to @jetbrains for sponsoring this post
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Anastasia Kazakova retweeted
Still picking up ping pong balls from yesterday 🏓 What an amazing night at SPIN SF — full of fantastic people, lively conversations, and a little friendly competition. Thank you for being part of our #GDC2026 celebration! We brought you back some photo highlights 📷👇
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Anastasia Kazakova retweeted
📢 @resharper is now available for @cursor_ai
If you’re developing in C# in an AI-first editor, ReSharper can help you ensure your code is production-ready.
Use inspections, refactorings, navigation tools, and coding assistance to review and refine both handwritten and o get started, look up “ReSharper” in the Extensions view of your editor.
If you’re developing in C# in an AI-first editor, ReSharper can help you ensure your code is production-ready.
Use inspections, refactorings, navigation tools, and coding assistance to review and refine both handwritten and o get started, look up “ReSharper” in the Extensions view of your editor.
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Anastasia Kazakova retweeted
🧙♂️Legend has it that some developers can spot C# code issues instantly. The rest of us use @resharper.
Now available for VS Code, Cursor, Google Antigravity, and other compatible editors.
Learn more 👉 jb.gg/rs-in-vsc-rele…
Now available for VS Code, Cursor, Google Antigravity, and other compatible editors.
Learn more 👉 jb.gg/rs-in-vsc-rele…
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Anastasia Kazakova retweeted
🦾 C# productivity in @code -compatible editors
ReSharper provides real-time code analysis with quick-fixes, reliable refactorings, and smart coding assistance with context-aware completions and templates.
These features help keep your code readable, maintainable, and ng repetitive work during everyday development.
Learn more: jb.gg/rs-in-vsc-value
ReSharper provides real-time code analysis with quick-fixes, reliable refactorings, and smart coding assistance with context-aware completions and templates.
These features help keep your code readable, maintainable, and ng repetitive work during everyday development.
Learn more: jb.gg/rs-in-vsc-value
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Anastasia Kazakova retweeted
ReSharper for VS Code and compatible editors is now generally available 🎉
After a year in public preview, the extension has officially been released for Visual Studio Code, Cursor, Google Antigravity, and other compatible editors.
📍 Gold-standard code analysis for C#, XAML, lution-wide refactorings
📍 Navigation (including to decompiled sources)
📍 Solution Explorer for managing projects, NuGet packages, and source generators
📍 Unit testing support
It’s available with a ReSharper or dotUltimate subscription and is free for non-commercial use.
Learn more here 👉jb.gg/rs-in-vsc-rele…
After a year in public preview, the extension has officially been released for Visual Studio Code, Cursor, Google Antigravity, and other compatible editors.
📍 Gold-standard code analysis for C#, XAML, lution-wide refactorings
📍 Navigation (including to decompiled sources)
📍 Solution Explorer for managing projects, NuGet packages, and source generators
📍 Unit testing support
It’s available with a ReSharper or dotUltimate subscription and is free for non-commercial use.
Learn more here 👉jb.gg/rs-in-vsc-rele…
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Anastasia Kazakova retweeted
This tweet should be framed 🖼️ Ten years ago at #NDCLondon, "Project Rider" was an early preview we were nervous to share.
Today we're back at NDC London 2026 with a world-famous IDE and a community that's grown beyond what we had imagined.
👋 Come to Cambridge Hall, Booth 16 if you want to reminisce - or just say hi!
Today we're back at NDC London 2026 with a world-famous IDE and a community that's grown beyond what we had imagined.
👋 Come to Cambridge Hall, Booth 16 if you want to reminisce - or just say hi!
We'll be revealing Project Rider at NDC London. Wednesday 13th January 2016 ndc-london.com/talk/project_r… #jetbrainsRider
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Congratulations to the Rider team and our beloved community! It's good to be back to #NDCLondon
This tweet should be framed 🖼️ Ten years ago at #NDCLondon, "Project Rider" was an early preview we were nervous to share.
Today we're back at NDC London 2026 with a world-famous IDE and a community that's grown beyond what we had imagined.
👋 Come to Cambridge Hall, Booth 16 if you want to reminisce - or just say hi!
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I'm proud to be the driving force of this event. It was insightful and fun! I can confirm. DJ-ing the panel slides from that table at the back was the personal insight )))
We hosted JetBrains Night during #TechCrunchDisrupt in San Francisco, and what a night! 🎉
🕹️ Arcade games that sparked nostalgic moments (Mario Kart, anyone?).
🤝 Incredible networking opportunities with founders, startup enthusiasts, and AI innovators shaping the future of king panel discussion featuring leaders from JetBrains, @cline , and @zencoderai .
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A year ago we launched non-commercial tier for @JetBrainsRider and @WebStormIDE and unlocked hundreds of thousands developers to implement their great ideas. Thank you everyone who joined ❤️🎂🎉 let’s keep creating awesome things together blog.jetbrains.com/blog/2024/10/2…
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Join us November 6th in Amsterdam, for a C++ meetup at Pinely: meetup.com/the-dutch-cpp-… #cpp
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