JetBrains ThinkRail puts coding agents, isolated workspaces and a spec graph into the IDE

ThinkRail from JetBrains

ThinkRail is an Apache-2.0 open-source agent IDE from JetBrains InnovationHub. It combines the pi coding agent, a Monaco editor, a terminal and a diff viewer in a browser interface.

Why it matters: ThinkRail isolates parallel agents' edits in separate git worktrees and has agents maintain a spec graph versioned with the code to preserve project intent.