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JetBrains Launches ThinkRail, an Agentic IDE Built on the pi Coding Agent

·2026.10.26 01:27

Key point

The open-source agentic IDE features isolated git worktree workspaces, living specs, and a lightweight architecture that runs the pi agent in-process.

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Details

  • JetBrains ThinkRail is an open-source agentic IDE that uses the pi coding agent to manage project knowledge through living specs and reusable skills.
  • The system isolates work using git worktrees, allowing agents to work in parallel on independent branches without affecting the main checkout.
  • Workspaces automatically settle to a per-project shelf if a PR is merged or closed, or if there is no activity for one week.
  • The architecture consists of a thin host running pi in-process, a typed wire protocol, and a React 19 UI client, licensed under Apache License 2.0.

Core Features

  • Supports multiple pi sessions per workspace with live token and cost tracking, subagent delegation, and shared plan editing.
  • Integrates with GitHub for PR creation, CI check monitoring, and automated merging based on previous user behavior.
  • Includes an MCP server configuration system that requires user confirmation for non-read-only tool calls.

Deployment and Privacy

  • Available as a native desktop app for macOS (Apple Silicon), Windows x64, and Linux, or as a self-contained CLI.
  • Collects basic usage events and error reports but does not store prompts, code, or credentials.
  • Requires Bun 1.4.4 and Node.js 22.19 or higher for local development and building.
open-sourceai-codingjetbrainsagentic-idepi-agentthinkrail
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