JetBrains ThinkRail is an open-source AI-powered development environment designed to make agent-driven coding more organized and practical. Developed under JetBrains InnovationHub, it combines an AI coding agent with a code editor, Git workspaces, terminals, and tools for reviewing and managing software changes.
Unlike a traditional IDE that primarily focuses on manual coding, ThinkRail is built around the Pi coding agent. Developers can ask the agent to implement features, investigate problems, modify code, and work through development plans while retaining control over the resulting changes.
One of its defining features is the use of isolated Git worktrees. Developers can create separate workspaces for different tasks, allowing AI agents to work on independent branches without directly modifying the main working directory. This approach makes ThinkRail an interesting option for developers who want to run multiple AI-assisted coding tasks while keeping their projects organized.
Features
AI-Assisted Coding with Pi
ThinkRail integrates the Pi coding agent directly into its development workflow. Users can start conversations with the agent, provide instructions, review tool activity, and guide ongoing work without constantly switching between separate applications.
Multiple conversations can run within a workspace, and each session can use its own model configuration. Developers can also steer an active task, queue follow-up instructions, and delegate work to subagents.
The interface displays agent activity alongside the resulting code changes, making it easier to understand what the agent has done and decide whether its work should be accepted.
ThinkRail does not provide its own independent AI model service. Users must authenticate with a supported provider, such as JetBrains AI, or configure their own provider credentials through Pi.
Isolated Git Workspaces
One of ThinkRail's strongest features is its Git worktree-based workspace management.
Developers can open a repository and create separate workspaces, each with its own working directory and branch. AI agents can then work on different tasks independently, reducing the risk of unfinished changes interfering with other development work.
Users can review each workspace, keep successful changes, and remove work that is no longer needed. ThinkRail also supports attaching existing worktrees or explicitly working in the original project directory.
This design is especially useful when experimenting with AI-generated implementations, testing alternative approaches, or handling several development tasks in parallel.
Integrated Code Editor
ThinkRail includes a Monaco-based editor with support for multiple tabs and split views. Developers can browse project files, inspect changes, edit code manually, and work alongside the AI agent.
The interface also provides a dedicated view of modified files, allowing users to review changes without relying exclusively on the agent's explanations.
For developers who already use Git-based workflows, this combination of editing, workspace management, and AI assistance can make agent-driven development easier to supervise.
Code Review and Pull Request Workflow
ThinkRail integrates Git operations into the development environment. Users can inspect changes, review diffs, and leave comments on files or specific sections of code.
The application also supports workflows for publishing branches and creating GitHub pull requests. Depending on the repository and available configuration, it can help prepare pull request descriptions, display CI checks, and assist with resolving failing checks or branch divergence.
These features reduce the need to move repeatedly between an AI coding tool, a code editor, and a browser-based repository interface.
However, developers should still review generated code, inspect diffs, and run appropriate tests before merging changes.
Living Project Specifications
ThinkRail introduces a specification-driven development workflow using interconnected SPEC.md files stored alongside the project code.
These specifications describe a project's requirements, architecture, and implementation decisions. The agent can access and maintain this information through dedicated tools, helping preserve important context beyond a single conversation.
The specifications are organized as a graph, which the application presents in a read-only viewer.
This approach can be useful for larger projects where developers need AI agents to understand existing architectural decisions rather than repeatedly reconstructing context from source files.
Its effectiveness depends on keeping the specifications accurate and updating them as the project evolves.
Reusable Skills and Workflows
ThinkRail supports portable Agent Skills, allowing users to reuse compatible skills from other AI coding workflows.
It also includes predefined workflows for tasks such as setting up projects, brainstorming designs, and preparing pull requests.
Reusable skills can help standardize recurring tasks and reduce the need to explain the same procedures to an agent repeatedly. Teams can benefit from this approach when establishing consistent development conventions across repositories.
Terminal and Development Tools
The integrated terminal lets developers run commands within the active workspace. This is useful for running tests, installing dependencies, starting development servers, and performing routine Git operations.
ThinkRail also provides access to additional agent tools, including web research and inline presentations of diagrams, comparisons, and file previews.
Together, these features make the application more than a chat interface attached to a code editor. It provides a working environment in which AI agents and developers can investigate, modify, and validate software projects.
Model Context Protocol Support
ThinkRail supports connecting Model Context Protocol (MCP) servers, allowing the agent to access additional tools and external services.
Users can configure MCP servers through settings and approve tools that perform operations beyond read-only access. Servers defined by a repository remain disabled until explicitly approved.
This permission-oriented approach gives developers more control over which external tools the agent can use. Nevertheless, MCP integrations should be treated carefully because connected tools may access sensitive data or perform consequential actions.
Desktop and Browser-Based Interfaces
ThinkRail offers a native desktop application as well as a command-line launcher that opens the interface in a browser.
Both approaches use the same underlying engine, so developers can choose the interface that best fits their workflow.
The CLI is particularly useful for users who prefer to launch the environment from a terminal or access the interface through a browser while the host process runs on their development machine.
ThinkRail requires Git and an authenticated AI provider. It does not require users to create a separate ThinkRail account.
Download ThinkRail v0.4.0 - Software Mirrors |
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ThinkRail v0.4.0 for Windowsthinkrail-windows-x64.exe | 235.75 MB thinkrail-desktop-windows-x64.zip | 54.19 MB stable-win-x64-ThinkRail-0.4.0.tar.zst | 53.75 MB |
ThinkRail v0.4.0 for macOSthinkrail-desktop-darwin-x64.dmg | 65.05 MB thinkrail-desktop-darwin-arm64.dmg | 61.77 MB thinkrail-darwin-x64 | 220.65 MB thinkrail-darwin-arm64 | 212.06 MB stable-macos-x64-ThinkRail-0.4.0.app.tar.zst | 42.68 MB stable-macos-arm64-ThinkRail-0.4.0.app.tar.zst | 40.11 MB |
ThinkRail v0.4.0 for Linuxthinkrail-linux-x64 | 230.74 MB thinkrail-linux-arm64 | 230.74 MB thinkrail-desktop-linux-x64.tar.gz | 55.92 MB thinkrail-desktop-linux-arm64.tar.gz | 54.55 MB stable-linux-x64-ThinkRail-0.4.0.tar.zst | 54.42 MB stable-linux-arm64-ThinkRail-0.4.0.tar.zst | 53.08 MB |
ThinkRail v0.4.0 Source Code
ThinkRail v0.4.0 Source code (zip)
ThinkRail v0.4.0 Source code (tar.gz)
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ThinkRail v0.4.0 Release Notes: What's Changed- fix(workspaces): create worktrees in the background so a large checkout never freezes the app by @rsolmano in #1202
- chore(github): remove SBOne-Kenobi from CODEOWNERS by @rsolmano in #1230
- fix(web): highlight every catalog language in chat by @Mark-Life in #1187
- fix(workspaces): send the last checkout progress when git exits inside the push throttle by @rsolmano in #1231
- feat(ask-user-question): redesign the questionnaire card — stable height, notes and Other in place, rich previews, Discuss, receipt by @danyaberezun in #1192
- fix(fs): identify SVG by its document root by @Afloat16 in #1184
- fix(cli): reject empty/non-decimal --port and --host, ignore invalid env values by @harshal-paltse in #1125
- feat: host search for the palette — files, specs, plans, chat transcripts and previews by @danyaberezun in #805
- ci: install Linux dependencies without restoring the Bun cache by @Mark-Life in #1242
- test: await promises the tests left floating by @Mark-Life in #1252
- chore(lint): fail biome on warnings and lock in clean rules by @Mark-Life in #1083
- fix(e2e): let the desktop runner exit as soon as the host shuts down by @Mark-Life in #1241
- fix(web): focus the composer input when its padding is clicked by @Mark-Life in #1163
- fix(web): fold fs-tick reads in branch status and preview by @Mark-Life in #1016
- scripts: parse boundary and seam imports with oxc-parser by @Mark-Life in #1233
- dialog: keep buttons and text inside the modal by @Mark-Life in #1157
- chat: follow a streaming answer by pinning its newest line instead of stepping by @Mark-Life in #1026
- chore: mark intentional fire-and-forget promises in shipped code by @Mark-Life in #1253
- chore(lint): reject floating promises by @Mark-Life in #1254
- feat: dictate into any text field with local NVIDIA Nemotron speech recognition by @rsolmano in #1228
- fix(workspaces): follow a branch switched in a managed workspace's terminal by @Mark-Life in #1028
- README update by @makingthematrix in #1219
- build(release): repack the Linux tarball with root ownership by @viwe-monai in #1003
- refactor: enable erasableSyntaxOnly and drop parameter properties by @Mark-Life in #1061
- test(contracts): widen the size gap in the linear-fold timing test by @danyaberezun in #1272
- refactor: remove no-op type assertions from production code by @Mark-Life in #1068
- build: typecheck with TypeScript 7 and drop TypeScript 6 by @Mark-Life in #1232
- docs(desktop): record that release signing must carry the microphone entitlement by @rsolmano in #1287
- fix(ui): keep a dialog open when a toast over it is pressed by @danyaberezun in #1271
- fix(packages): read the catalog fresh when the Extensions page opens by @danyaberezun in #1273
- perf(locales): load bundled translations on demand by @Mark-Life in #1251
- ci(e2e): deal browser tests to shards round-robin instead of contiguous blocks by @Mark-Life in #1238
- ci(e2e): run the no-agent browser suite as three jobs by @Mark-Life in #1239
- chore(github): add artyomxx and Mark-Life to CODEOWNERS by @danyaberezun in #1291
- test(contracts): bound folding a large decomposed text in absolute time by @danyaberezun in #1292
- fix(chat): fold the turn's Done row into one footer line by @Mark-Life in #1290
- feat(web): highlight chat code with Pierre in the worker by @Mark-Life in #1274
- perf(web): send and parse only new lines while chat code streams by @Mark-Life in #1275
- chore(deps): upgrade @pierre/diffs to 1.6.4 and vite to 8.3.5 by @Mark-Life in #1276
- feat(web): highlight diffs with Pierre and the chat color table by @Mark-Life in #1277
- feat(web): highlight the file editor with Pierre by @Mark-Life in #1278
- chore(web): keep Shiki out of the build by @Mark-Life in #1279
- feat(web): color every Pierre language in the file editor by @Mark-Life in #1280
- chore(web): keep unused Pierre theme catalogs out of the build by @Mark-Life in #1281
- feat(server): budget the skills listing and add skill_search for large catalogs by @OLavrik in #1218
- feat(web): start work from the palette's typed text by @danyaberezun in #806
- fix(desktop): keep the title bar draggable and a failed editor chunk out of a retry loop on Chromium 156 by @danyaberezun in #1294
- chore(deps): upgrade posthog-node to 5.57.2, @posthog/core to 1.60.1 and @posthog/cli to 0.18.12 by @danyaberezun in #1295
- chore(deps): bump @lobehub/icons-static-svg to 1.101.0, bun-pty to 0.5.2 and @astrojs/markdown-satteri to 0.4.6 by @danyaberezun in #1296
- chore(deps): upgrade Biome to 2.6.3 by @danyaberezun in #1297
- feat(skills): make other agents' skills opt-in and show the skill catalog's size by @OLavrik in #1221
- feat(web): focus the chat input after a Cmd+K workspace or chat pick by @rsolmano in #1298
- ci: install WebKit's linked libraries from a main-seeded .deb cache instead of the mirror by @danyaberezun in #1300
- Blog post: The Chat by @makingthematrix in #1244
- Chats without a project: a built-in Chats container with one scratch folder per chat by @danyaberezun in #887
- Continue a chat without a project in a new workspace: the agent's summary becomes the handoff by @danyaberezun in #888
- chore(deps): upgrade pi to 1.5.2 and expose cache warming in Settings by @rsolmano in #1301
- feat: Find in Files — search file contents across the workspace from a ⌘⇧F window and open the hit at its line by @danyaberezun in #933
- feat: add raster favicon and touch-icon fallbacks to the web UI and the website by @danyaberezun in #1307
- docs: record the #881 review decisions and the Electrobun/Hutch gaps the desktop accepts by @danyaberezun in #906
- feat: spec section search — rank spec sections by words for the palette's # scope and the agent's spec_search, and ask the agent from # by @danyaberezun in #939
- feat: let the agent start workspaces and check their status — #934 on the global-search stack by @danyaberezun in #941
- feat(web): dock the agent's questions above the message box by @danyaberezun in #1311
- fix(web): let the Settings model lists scroll with the wheel by @xtenzQ in #1166
- fix(fs): require a BMP DIB header before classifying bytes as an image by @1-DARK in #1226
- fix(web): send chat messages over plain-http origins without crypto.randomUUID by @1-DARK in #1111
- fix: refuse prompts over the 16 MiB WebSocket frame cap instead of raising it by @xtenzQ in #1018
- fix(server): find editors without blocking the host on a slow PATH by @Mahdi-Hasan in #1159
- fix(host): prefer configured connections for new chats by @Yutong43 in #1168
- fix(server): never run a restored chat on a model the user did not choose by @OLavrik in #1310
- fix(server): read Ollama's reported context window by @markjoin123 in #1217
- fix(subagents): read model "inherit" as the parent's model and list available models on a miss by @OpenLucasKaka in #1312
- fix(web): show why a plan review failed instead of a bare no-verdict line by @oisano11 in #990
- fix(server): only ask for a plan review on steps that changed files by @oisano11 in #992
- fix: allow fresh branch review lookups to bypass in-flight requests by @rushikeshsanap1512 in #1037
- fix(review): show a Source fallback in rendered previews by @euvoor in #1222
- fix(resource-renderers): stop frontmatter stripping at an empty block's fence by @g1obalworlds in #1048
- fix(web): align loose-list text with its marker by @rudycelekli in #1052
- fix(resource-renderers): drop a leading BOM before parsing CSV by @kevin9327 in #1050
- fix(web): don't show GitHub as Not connected before the auth probe answers by @gibkim in #1136
- Strip complete terminal control strings from notebook output by @Afloat16 in #1258
- fix(i18n): detect hardcoded text through transparent type wrappers by @xunguangzlj-cloud in #993
- fix(git): show changes in a repo with no commits instead of a bad revision error by @ernsahin in #1020
- fix(delegation): report routed subagent model and effort by @aimmetal-tech in #1021
- fix(terminal): give test shells their own home so tests stop writing to the developer's shell history by @enbiyagoral in #1036
- fix(server): ignore transient git metadata locks by @flssr in #1104
- fix(web): bridge WebKit's Korean IME into the terminal by @JoisFe in #891
- fix(web): restore a detached chat's reading position across tab switches by @aaditiiiii1 in #986
- fix(projects): bootstrap a new repo off the event loop without auto-gc by @L1nq0 in #1045
- fix: keep compacted turns visible above the summary marker by @superjinge in #1321
- fix(e2e): give Windows hosts a hermetic PATH that can find git by @ernsahin in #1024
- fix(providers): let a custom server's thinking be turned off on chat-template models by @lazarevtill in #1132
- fix(persistence): write registry files atomically and set aside unreadable ones by @1-DARK in #1225
- fix(server): show the Explorer window when revealing a folder on Windows by @Mahdi-Hasan in #1158
- fix(web): preserve image drafts across chat remounts by @rudycelekli in #1051
- fix(web): stop auto-probing custom server models on edit; add filter and paging by @1-DARK in #1135
- fix(watch): refresh remote status after terminal git push by @OKAN-SOFTWARE in #1044
- fix(server): don't watch git-ignored folders on Linux by @xtenzQ in #1137
- Improve json diff view to indicate changed nodes and show change summary by @zhuravlikjb in #953
- fix(templates): reject Windows reserved device names by @OKAN-SOFTWARE in #1042
- feat(locales): translate the font, package, and resource keys the Chinese catalog is missing by @oisano11 in #1134
- feat(locales): fill the remaining es, ja and ru translations by @eatmoreduck in #1262
- workspaces: allocate branch names from one batched branch listing by @eatmoreduck in #1263
- feat(web): add system fallbacks to the code font stack by @AZEROSTART in #1170
- fix(web): close ask-user-question note on blur by @ege-arhan in #1322
- feat(web): copy a file path from the Files tree and file tabs by @mvanhorn in #959
- feat(web): list each model-picker provider group newest first by @ernsahin in #1019
- fix(web-access): isolate web work across chat sessions by @dhruvwarriorr in #1040
- feat(web): copy the terminal selection with Ctrl+Shift+C on Linux and Windows by @Jmi2020 in #1259
- feat(web): add a heading outline beside Markdown previews by @mvanhorn in #960
- feat(extensions): forward editor text to the chat composer by @matwming in #1215
- feat(locales): add a Traditional Chinese (Taiwan) catalog by @leoho0722 in #1249
- feat(providers): let a custom endpoint's model set its own context window by @eatmoreduck in #1197
- feat(web): reorder sidebar projects by drag and drop by @dingdinglz in #900
- feat: add file tree context actions by @b4rtaz in #1177
- feat(desktop): add thinkrail:// deep links to open files at a line by @misswell in #1314
- feat(web): refresh Resources — drop New, fold the dock, inspect MCP servers by @danyaberezun in #1331
New Contributors- @viwe-monai made their first contribution in #1003
- @xtenzQ made their first contribution in #1166
- @Mahdi-Hasan made their first contribution in #1159
- @Yutong43 made their first contribution in #1168
- @markjoin123 made their first contribution in #1217
- @OpenLucasKaka made their first contribution in #1312
- @rushikeshsanap1512 made their first contribution in #1037
- @g1obalworlds made their first contribution in #1048
- @rudycelekli made their first contribution in #1052
- @gibkim made their first contribution in #1136
- @xunguangzlj-cloud made their first contribution in #993
- @ernsahin made their first contribution in #1020
- @aimmetal-tech made their first contribution in #1021
- @enbiyagoral made their first contribution in #1036
- @flssr made their first contribution in #1104
- @JoisFe made their first contribution in #891
- @aaditiiiii1 made their first contribution in #986
- @L1nq0 made their first contribution in #1045
- @superjinge made their first contribution in #1321
- @lazarevtill made their first contribution in #1132
- @OKAN-SOFTWARE made their first contribution in #1044
- @AZEROSTART made their first contribution in #1170
- @ege-arhan made their first contribution in #1322
- @mvanhorn made their first contribution in #959
- @dhruvwarriorr made their first contribution in #1040
- @Jmi2020 made their first contribution in #1259
- @matwming made their first contribution in #1215
- @leoho0722 made their first contribution in #1249
- @b4rtaz made their first contribution in #1177
- @misswell made their first contribution in #1314
Full Changelog: v0.3.2...v0.4.0 |
Performance and Compatibility
ThinkRail is designed around a lightweight application host and a web-based interface. Its architecture separates the agent engine, communication protocol, and user interface, allowing the interface to communicate with the local host through HTTP and WebSockets.
The application is available for Windows, Linux, and macOS, although desktop package availability differs by platform. The native desktop build supports Apple silicon Macs rather than Intel Macs. The CLI has broader platform coverage, but Intel Mac users may need to build it from source.
Linux desktop builds have specific system library requirements. The documented desktop packages target relatively recent distributions, including Ubuntu 24.04 or newer, and require compatible GTK, WebKitGTK, and other libraries.
ThinkRail's performance also depends on the selected AI provider, model, network connection, repository size, and number of concurrent agent sessions. Running multiple agents can improve productivity, but it may also increase model usage and resource consumption.
The project is licensed under Apache 2.0, making its source code available for inspection and modification under the license terms.
ThinkRail is still an evolving project, so users should expect ongoing changes to its interface, integrations, and workflows. Developers adopting it for professional projects should test it against their existing repositories and development processes before making it their primary environment.
System Requirements
ThinkRail supports the following environments:
Windows: Windows x64 desktop package or CLI.
macOS: Apple silicon for the native desktop application. Intel Mac users may need to build the CLI from source.
Linux: x64 and ARM64 CLI packages, with desktop packages available for supported environments.
Git: Required for repository and worktree management.
AI provider: An authenticated Pi-compatible provider, such as JetBrains AI or another supported provider.
Linux desktop libraries: GTK 3, WebKitGTK 4.1, Ayatana AppIndicator 3, and librsvg 2 for the documented desktop builds.
Developers building ThinkRail from source need Bun and a compatible Node.js installation. The repository's development instructions specify the required toolchain.
The project does not establish a single minimum RAM or CPU recommendation for every workload. Resource requirements will depend on repository size, the number of active workspaces, and the AI models and tools being used.
Pros and Cons
Pros
Open-source AI coding environment licensed under Apache 2.0.
Integrates the Pi coding agent with a full development interface.
Uses isolated Git worktrees to separate AI coding tasks.
Supports multiple agent conversations and concurrent work.
Includes a Monaco editor, file browser, terminal, and Git change views.
Provides code review and GitHub pull request workflows.
Maintains project context through interconnected specifications.
Supports reusable Agent Skills and MCP integrations.
Offers desktop and browser-based interfaces.
Lets users connect their own AI provider credentials.
Cons
Requires an external AI provider and authentication.
AI usage may incur costs depending on the selected provider and plan.
The native desktop application does not support Intel Macs.
Linux desktop builds require compatible system libraries.
Multiple concurrent agents can increase resource usage and model consumption.
The specification-driven workflow requires developers to maintain accurate project documentation.
As an evolving project, its features and workflows may change between releases.
Usage analytics are enabled by default, although users can disable them in settings or through the documented environment options.
How to Install
Visit the official ThinkRail GitHub repository.
Open the Releases section and select a package for your operating system.
Download the appropriate desktop package or install the CLI using the official installation instructions.
For Linux desktop installations, ensure the required system libraries are installed.
Launch ThinkRail and authenticate with JetBrains AI or configure another supported Pi provider.
Open an existing Git repository or create a new project.
Create a workspace if you want to isolate an AI coding task in a separate Git worktree.
Start a conversation with the agent, review its proposed changes, and run your tests before merging or publishing the result.
For CLI installation, the official repository provides installation scripts for Unix-like systems and Windows. The installer verifies the downloaded binary's SHA-256 checksum.
Users who want to reduce telemetry collection can disable analytics through the application's privacy settings or the documented THINKRAIL_NO_ANALYTICS=1 environment variable.
Final Verdict
JetBrains ThinkRail is a promising open-source AI coding environment for developers who want more control over agent-driven software development. Its combination of Pi integration, isolated Git workspaces, code review tools, reusable skills, and project specifications addresses several practical challenges associated with using AI agents on real codebases.
Its most compelling advantage is the way it organizes AI-generated changes. Rather than treating coding as a sequence of chat prompts, ThinkRail gives each task a workspace where developers can inspect files, review diffs, run commands, and decide what to merge.
The main trade-offs are its reliance on external AI providers, platform-specific installation requirements, and evolving feature set. Users also need to consider model costs and review generated code carefully, especially when running multiple agents in parallel.
For developers who regularly use Git and want an organized environment for AI-assisted coding, ThinkRail is worth trying. It is less compelling for users who need a completely self-contained AI service or a mature, all-in-one IDE with no additional provider configuration.