# Claude Code

> Connect Claude Code to your Holistics workspace via MCP.

[Claude Code](https://claude.ai/code) supports both a CLI command and a JSON config. Replace `<MCP_SERVER_ADDRESS>` with your [connection URL](/docs/ai/mcp-server/setup#oauth).

**Option 1 — CLI command** (quickest):

```bash
# With OAuth
claude mcp add holistics-<ENV> <MCP_SERVER_ADDRESS> --transport http

# With API Key
claude mcp add holistics-<ENV> <MCP_SERVER_ADDRESS> --transport http --header "X-Holistics-Key:<YOUR_HOLISTICS_API_KEY>"
```

**Option 2 — JSON config** — add to your [Claude Code MCP config](https://docs.anthropic.com/en/docs/claude-code/mcp#add-mcp-servers-from-json-configuration):

```json
{
  "mcpServers": {
    "holistics": {
      "url": "<MCP_SERVER_ADDRESS>",
      "headers": {
        "X-Holistics-Key": "<YOUR_HOLISTICS_API_KEY>"
      }
    }
  }
}
```

For OAuth, omit the `headers` field — the client handles authentication automatically.

Note: No spaces between `X-Holistics-Key:` and your API key.