JetBrains' ThinkRail Adds to Crowded AI Lineup, Exposing Strategic Drift

What ThinkRail Offers

ThinkRail is an open-source project incubated in JetBrains' InnovationHub. It provides a graphical interface for the command-line Pi Agent, accessible via browser or desktop app. The editor uses Monaco, the same component that powers VS Code. ThinkRail surfaces Pi's operations — reading files, editing code, running commands — in a unified workspace where code, chat sessions, and the working directory coexist. Users can select models per session, monitor token usage and cost, and inject new instructions while the agent runs. Switching models does not change the underlying Pi runtime.

Development workflows leverage Git worktrees: each task can get an isolated worktree with its own branch and file tree, while a single workspace can host multiple chat threads. The editor, terminal, and Git diff view all center on the current workspace. A default workspace can point directly at the original repository; isolation is not automatic for every new chat. The project is explicitly early-stage, aimed first at lowering the entry barrier for existing Pi users.

Comparison with Orca

ThinkRail's design echoes Orca, another agent workbench that combines agent execution, worktrees, terminal, and code review in one UI. A key difference: Orca runs multiple agents side-by-side — Claude Code, Codex, OpenCode, Pi — whereas ThinkRail is hardwired to Pi only. For developers already familiar with this class of tool, ThinkRail must justify why it deserves adoption despite its single-agent constraint.

JetBrains' Scattered AI Roadmap

Late 2023: AI Assistant publicly released.

Early 2025: Junie enters early preview.

Late 2025: Fleet, an AI-first IDE attempt, stops updates and distribution; later reborn as Air.

March 2026: Air enters public preview.

August 2026: ThinkRail announced.

JetBrains itself acknowledges the cost of this churn. Fleet overlapped with the existing IDE lineup, confusing users and diluting focus. Junie and AI Chat originally had separate UIs; only in December 2025 did the company announce a merger. The pattern: ship fragmented entry points, then slowly consolidate — leaving users to memorize names and pick tools.

Author's Critique

JetBrains now maintains Air, which already supports multi-agent parallelism and code review, while simultaneously incubating ThinkRail as a Pi-specific workbench. The author argues this reflects strategic drift: more products, yet positioning keeps shifting backward. After decades building IDEs, the vendor appears to be chasing the agent-era market rather than defining it, releasing new tools that demand explanation instead of delivering a coherent vision.