JetBrains launched Junie in mid-2025 as the agentic evolution of its AI Assistant product, integrated natively into IntelliJ IDEA, PyCharm, WebStorm, GoLand, and other JetBrains IDEs. Unlike earlier JetBrains AI features focused on completion and chat, Junie operated as a full coding agent: it accepted a task description, generated a “Task Blueprint” planning all required steps, executed code changes across multiple files, ran the compiler and test suite, and iterated on failures until the build was clean.
The November 2025 launch of Junie CLI extended the agent to any terminal or CI/CD pipeline, and the March 2026 GA release made it generally available. Agent Skills with MCP support allowed Junie to use external tools during task execution.
Junie represented the incumbent IDE vendor’s response to the agentic coding trend. Where startups like Cursor and Windsurf had pulled developers away from established IDEs, JetBrains used its deep language server and refactoring infrastructure as differentiation: Junie had access to the same AST, type system, and project model that powered decades of JetBrains refactoring tools.