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Reasonix

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An open-source coding agent that reads projects, edits files, and runs commands and tests.

Open sourceAI Code AssistantsAI Agents

Verified Nov 2, 2026

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Reasonix website screenshot

What is Reasonix?

Reasonix is an MIT-licensed coding agent that runs on your computer and uses a model account you configure. You open a project folder, describe a task, and let it inspect files, make changes, and run commands or tests. It is available as a desktop application, terminal interface, locally served browser interface, and editor integration.

You control how much independence the agent has. It can request approval before writes and commands, or perform routine actions within rules you set. Plan mode lets you approve its proposed approach before work begins. Checkpoints let you rewind files changed by its editing tools without altering Git history, but do not cover changes made by shell commands.

Reasonix supports DeepSeek and other OpenAI-compatible model services. It can connect to external tools through MCP, load custom skills written in Markdown, and delegate research or review to helper agents. Desktop and command-line versions support macOS, Windows, and Linux; editor access includes VS Code, VSCodium, and editors supporting ACP.

What can Reasonix do?

  • Project editing and testing

    Reads project files, makes code changes, and runs commands and tests from a natural-language task.

  • Configurable permissions

    Requires approval for writes and commands or allows routine actions within your rules, with command sandboxing on macOS and Linux.

  • File checkpoints

    Rewinds changes made by its editing tools by conversation turn, independently of Git history.

  • Plan approval

    Drafts a plan and waits for your approval before starting work.

  • Tools, skills, and helper agents

    Connects external tools through MCP, loads Markdown skills, and delegates side tasks to helper agents.

  • Bring your own model

    Uses your configured model account, with support for DeepSeek and other OpenAI-compatible services.

Who is Reasonix for?

Software developers
Delegate code changes, refactoring, and test runs while reviewing plans, permissions, and file edits.

Frequently asked questions

Is Reasonix free to use?

Reasonix is open source under the MIT license and can run on your own computer. You supply your own model account and key.

Which platforms does Reasonix support?

Desktop and command-line versions run on macOS, Windows, and Linux. It also offers a locally served browser interface, a VS Code and VSCodium extension, and ACP connections for compatible editors.

Can I undo the agent's changes?

Checkpoints let you rewind files changed by Reasonix's editing tools by conversation turn without changing Git history. Changes made by shell commands are not covered.

Can I approve work before it starts?

Plan mode waits for approval before executing a proposed plan. You can also require approval before every write and command.

How can I protect the browser interface?

The browser interface is served from your own machine. Enable password or token authentication before sharing it through a tunnel or remote port.

Reasonix alternatives

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  1. 1ClineAn open-source coding agent for your editor, desktop, terminal, and applications.
  2. 2WarpAn AI-assisted terminal and coding agent for local and cloud software development.
  3. 3CursorAn AI coding editor and agent for building, testing, and reviewing software.
  4. 4Claude CodeAnthropic's agentic coding tool that plans, edits, tests and opens pull requests.
  5. 5Gemini CLIAn open-source terminal agent for coding, codebase analysis, and workflow automation.

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