> ## Documentation Index
> Fetch the complete documentation index at: https://radiusbrowser.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Welcome to Radius

> Radius is a browser where you can run coding agents in parallel, right next to your PRs, docs, terminals, and localhost servers.

## What is Radius?

Radius is a browser where you can run multiple coding agents in parallel.

The core primitive of Radius is a tab. Your agent runs in a tab. Your terminal is a tab. Your diff viewer is also a tab. This means your context can live right next to your PRs, docs pages, and dashboards. Just like any other browser, tabs can be split, reordered, arranged, and organized just like your favorite browsers.

We also bring other concepts from Arc, like groups and spaces, to worktree orchestration. For instance, each project you attach to a chat in Radius gets it's own space. Opening new worktree in Radius creates a new group in that space.

While we have opinionated defaults, Radius is programmable. A project's setup
script can prepare a new worktree and arrange its tabs through the Radius CLI.

## Why use Radius?

As developers, we spend most of our days drowning in tabs. We juggle PR reviews, planning docs, documentation, dashboards, and localhost servers, only to switch back to the IDE and leave all of that context behind.

Agents made this worse. For every worktree we add, the context we have to hold in our head multiplies, and we open a new set of tabs for the task at hand. Radius helps eliminate this context-switch-tax.

Since Radius is a browser for orchestrating coding agents, you never have to switch between your agent orchestrator and your browser. With setup scripts and the Radius CLI, Radius is programmable so you can make it so that all your relevant context can follow you with each task.

| Without Radius                                                                        | With Radius                                                                                         |
| ------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- |
| Create and wire up each worktree manually                                             | One-click worktree creation                                                                         |
| Re-open GitHub PRs, localhost servers, and Linear issues every time you switch a task | Configure the tabs every worktree opens with (e.g. issues, PRs, terminals, docs, localhost servers) |
| Tab back and forth between browser and IDE                                            | Stay in one tool                                                                                    |

## How is this different?

Other agent orchestrators are designed to setup worktrees and their dependencies. But, they miss what comes after. Developers still have to go to the browser to test changes, review PRs, update dashboards, and triage related issues.

In Radius, setup scripts prepare the development environment *and* the workspace. Each worktree can open with its agents, terminals, issue, documentation, and localhost server already arranged as tabs and splits.

Radius uses your Claude Code, Codex, or Cursor agents, using the subscriptions you already pay for.

## FAQ

<AccordionGroup>
  <Accordion title="What happens when I create a worktree?">
    Radius creates an isolated checkout, copies configured ignored files, and opens the worktree as a browser group. It then runs the project's setup script in the background when configured.
  </Accordion>

  <Accordion title="Can each worktree open different tabs?">
    Yes. Setup scripts can choose which issues, pull requests, documentation, terminals, agent sessions, dashboards, and localhost servers open for a worktree, including how those tabs are split and focused.
  </Accordion>

  <Accordion title="Can agents interact with the running application?">
    Yes. Browser-use agents can inspect, navigate, and act on pages in the same live workspace, subject to the permissions you grant them.
  </Accordion>

  <Accordion title="Does Radius continuously enforce the tab layout?">
    No. Setup runs once when Radius creates the worktree. After it finishes, you can navigate, move, split, or close tabs normally.
  </Accordion>

  <Accordion title="Can I bring my own subscription?">
    Yes. Connect the Claude, Codex, or Cursor account and subscription you already use. See [agent authentication](/docs/agents/overview) to choose a setup method.
  </Accordion>

  <Accordion title="Is Radius free?">
    Yes. Radius is free and adds no additional agent subscription.
  </Accordion>

  <Accordion title="Which platforms is Radius available on?">
    Radius is currently available for macOS on Apple Silicon and Intel Macs.
  </Accordion>
</AccordionGroup>

<CardGroup cols={2}>
  <Card title="Configure your first worktree" icon="bolt" href="/docs/quickstart">
    Add setup behavior, then create a worktree and see the complete result.
  </Card>

  <Card title="Understand how it works" icon="diagram-project" href="/docs/project-settings/overview">
    Learn how projects, worktrees, setup, groups, and tabs fit together.
  </Card>
</CardGroup>