JetBrains Innovation Hub has released ThinkRail, an open-source agentic IDE under the Apache-2.0 license designed to improve with use. The tool allows developers to open a repository as a project and utilize isolated git-worktree workspaces to manage parallel development. A key feature is the ability to pair with a real agent across Monaco tabs, terminals, and diffs, where project intent is maintained in a spec graph the agent reads.
Installation is streamlined via a local launcher, with commands provided for macOS, Windows (PowerShell and Command Prompt), WSL, and Linux to open the browser UI. ThinkRail distinguishes itself by giving agents their own worktrees, ensuring that each workspace operates on its own branch and working directory. This architecture prevents mess from affecting the main branch until explicitly merged, allowing users to switch workspaces instantly without reloading or leaking state across projects.
The IDE features a real interface built on the Monaco editor, offering syntax highlighting, rendered markdown, and file tabs per workspace. Additional panes include a file tree, live git diff, and PTY-scoped terminals for running tests. Chat functionality streams real pi sessions.
The system employs a 'three rings' architecture: the engine host, a typed wire protocol, and a UI client. It supports multiple concurrent sessions with live token and cost tracking, allowing users to select models per session and steer running turns interactively.
Source: Hacker News · Summarized by HeadlinesBriefing