---
title: "MPS 2026.2 Release Candidate Available"
description: "JetBrains has released the MPS 2026.2 Release Candidate, a language workbench for creating domain-specific languages, with several key improvements over the previous EAP1 build. The RC adds Linux ARM64 support with a bundled JetBrains Java Runtime and the ability to build standalone MPS-based applications for that architecture. Build Language now supports importing files from TAR archives, preserving symbolic links and file permissions, which is useful for packaging platform-specific plugins and native libraries. The Projectional Agent Toolkit receives a major performance boost with token usage reductions exceeding 50% in tests using Claude Code, plus new MCP tools for typesystem debugging, intentions, and quick-fixes. Archive packaging preserves symbolic links and uses .tar.gz for macOS to avoid duplicate native libraries, while the Import dialog now respects user selections and the Diff dialog has visual improvements."
---

# MPS 2026.2 Release Candidate Available

[Jetbrains](https://yomu.fyi/company/jetbrains) · Vaclav Pech · Oct 15, 2026

**Type:** Announcement

## Summary

JetBrains has released the MPS 2026.2 Release Candidate, a language workbench for creating domain-specific languages, with several key improvements over the previous EAP1 build. The RC adds Linux ARM64 support with a bundled JetBrains Java Runtime and the ability to build standalone MPS-based applications for that architecture. Build Language now supports importing files from TAR archives, preserving symbolic links and file permissions, which is useful for packaging platform-specific plugins and native libraries. The Projectional Agent Toolkit receives a major performance boost with token usage reductions exceeding 50% in tests using Claude Code, plus new MCP tools for typesystem debugging, intentions, and quick-fixes. Archive packaging preserves symbolic links and uses .tar.gz for macOS to avoid duplicate native libraries, while the Import dialog now respects user selections and the Diff dialog has visual improvements.

## Context

JetBrains MPS is a language workbench for creating domain-specific languages. This release candidate follows the EAP1 build and includes new features and bug fixes.

## Takeaways

- MPS 2026.2 RC adds Linux ARM64 support with a bundled JetBrains Java Runtime and the ability to build standalone MPS-based applications for that architecture.
- The Projectional Agent Toolkit’s MCP API has been reworked to reduce token usage by over 50% in tests, with new tools for typesystem operations, intentions, quick-fixes, and log reading.
- Archive packaging now preserves symbolic links and uses .tar.gz for macOS distributions to avoid duplicate copies of native libraries.

## FAQ

### What new platform support does MPS 2026.2 RC add?

It adds Linux ARM64 support, including a bundled JetBrains Java Runtime and the ability to build standalone MPS-based applications (RCPs) for that architecture.

### How does the Projectional Agent Toolkit performance improve?

Token usage on common tasks like DSL modeling is reduced by over 50% in tests using Claude Code, due to a rework of the MPS MCP API with consistent parameter naming, bulk operations, and one-shot model validation.

### What changes were made to archive packaging?

MPS 2026.2 preserves symbolic links and file permissions when packaging platform-specific plugins, and macOS archive distributions now use .tar.gz instead of .zip to preserve symbolic links.

**Tags:** [JetBrains](https://yomu.fyi/topic/jetbrains), [MPS](https://yomu.fyi/topic/mps)

- Source: [Jetbrains](https://blog.jetbrains.com/mps/2026/10/the-mps-2026-2-rc1)
- Source URL: https://blog.jetbrains.com/mps/2026/10/the-mps-2026-2-rc1
- Ingested by Yomu: 2026-10-15T12:00:17.672Z

[Read original post](https://blog.jetbrains.com/mps/2026/10/the-mps-2026-2-rc1)