Plandex

Plandex is an open source, terminal based AI coding agent designed for large tasks and real projects. It can plan and carry out work that spans many steps and touches dozens of files, and it is released under the MIT license with a local self hosted mode. The agent can handle up to 2 million tokens of context directly and can index directories of 20 million tokens or more using tree sitter project maps. A cumulative diff review sandbox keeps AI generated changes separate from the project files until the developer approves them, and command execution is controlled so changes can be rolled back and debugged. Plandex can load relevant files, plan and implement changes, run commands and debug automatically, or work step by step with review, depending on how much autonomy the developer configures. It combines models from Anthropic, OpenAI, Google and open source providers, so teams can mix models within a workflow. It is aimed at developers who find other tools struggle once a project or change becomes large, and who prefer a command line workflow with version control style review of what the model produced. The project is written in Go and is installed from the command line. The software is free and open source under the MIT license. The repository lists no paid plans, and model usage is billed separately by whichever providers the developer connects.