> ## 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.

# Claude CLI

> Use your existing Claude login, settings, and provider environment.

| Item          | Behavior                                             |
| ------------- | ---------------------------------------------------- |
| Use for       | Claude login, Bedrock, Vertex AI, and Foundry        |
| Configuration | Your normal `CLAUDE_CONFIG_DIR`, usually `~/.claude` |
| Credentials   | Your native Claude login or cloud credential chain   |
| Models        | Live results from the Claude SDK                     |

## How it works

1. Radius launches its bundled Claude runtime with your normal Claude home and
   shell environment.
2. Claude reads your login plus user, project, and local settings.
3. Radius requests the available models.
4. Claude uses its native default. Your Radius selection overrides it for the
   conversation.

If you need to sign in, use the Claude sign-in action in Radius. Radius uses the
same Claude home as the regular CLI.

## Configuration cases

| Situation                                    | What happens                                                  |
| -------------------------------------------- | ------------------------------------------------------------- |
| Claude isn't installed                       | Radius uses its bundled Claude runtime.                       |
| No user settings exist                       | Claude uses its defaults and any applicable project settings. |
| `CLAUDE_CONFIG_DIR` points elsewhere         | Radius uses that Claude home.                                 |
| Your installed Claude is older or newer      | It doesn't affect Radius. Radius uses its bundled version.    |
| Your settings require a newer Claude version | Update Radius when a release includes that Claude version.    |

## Cloud providers

### Google Cloud Vertex AI

Set `CLAUDE_CODE_USE_VERTEX=1`, then configure your Google Cloud project,
region, credentials, and any model mappings through Claude's supported
environment and settings. Select **CLI** in Radius.

* Anthropic: [Configure Claude Code for Google Vertex AI](https://code.claude.com/docs/en/google-vertex-ai)
* Google Cloud: [Use Anthropic Claude models on Google Cloud](https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/partner-models/claude)

### Microsoft Foundry

Set `CLAUDE_CODE_USE_FOUNDRY=1`, then configure your Foundry resource,
credentials, and model deployments through Claude's supported environment and
settings. Select **CLI** in Radius.

* Anthropic: [Configure Claude Code for Microsoft Foundry](https://code.claude.com/docs/en/microsoft-foundry)
* Microsoft: [Configure Claude Code with Microsoft Foundry](https://learn.microsoft.com/en-us/azure/foundry/foundry-models/how-to/configure-claude-code)

### Amazon Bedrock

Set `CLAUDE_CODE_USE_BEDROCK=1`, then configure your AWS profile or credentials,
region, and any model mappings through Claude's supported environment and
settings. Select **CLI** in Radius.

* Anthropic: [Configure Claude Code for Amazon Bedrock](https://code.claude.com/docs/en/amazon-bedrock)
* AWS: [Deploy Claude Code with Amazon Bedrock](https://docs.aws.amazon.com/solutions/claude-code-with-amazon-bedrock/)