JetBrains MPS 2026.1 adds MCP support for AI coding agents
JetBrains MPS 2026.1 is out, and the headline addition is the Projectional Agent Toolkit: a new layer that lets AI coding agents interact directly with MPS models through the Model Context Protocol.
What Changed
- Projectional Agent Toolkit: AI coding agents can now read and manipulate MPS models over MCP, opening the door to agent-driven language engineering workflows.
- Runtime updates: The platform migrates to IntelliJ 2026.1, JDK 25, and Kotlin 2.3, with full support for KLib-based Kotlin stubs.
- Build Language transitive dependencies: Build Language scripts now handle transitive dependencies automatically, cutting down manual dependency wiring on large projects.
For teams using MPS to build domain-specific languages, the MCP integration is the most operator-relevant change. It means existing AI coding agents can slot into the projectional editor workflow without a custom bridge layer.
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