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Claude Code Integration

You can configure Claude Code to direct its requests through the LeanMCP AI Gateway by using environment variables.

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Configuration

Claude Code reads its settings from a JSON configuration file. You can inject environment variables directly into this configuration to override the default Anthropics API endpoints.
1

Locate Configuration File

Find your .claude/settings.json file. This is typically located in your home directory:
  • Windows: C:\Users\<your-username>\.claude\settings.json
  • macOS/Linux: ~/.claude/settings.json
2

Update Environment Variables

Add the env property to your settings.json to set the base URL and authentication token.
{
  "autoUpdatesChannel": "latest",
  "env": {
    "ANTHROPIC_BASE_URL": "https://aigateway.leanmcp.com/v1/anthropic",
    "ANTHROPIC_AUTH_TOKEN": "leanmcp_your_api_key_here",
    "ANTHROPIC_API_KEY": ""
  }
}
Ensure ANTHROPIC_API_KEY is set to an empty string ("") or removed if ANTHROPIC_AUTH_TOKEN is used, to avoid conflicts. The Gateway uses ANTHROPIC_AUTH_TOKEN (mapped to your LeanMCP key).

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usage

Once configured, simply use claude commands as normal. All requests will be routed through the LeanMCP AI Gateway, providing you with unified logging and observability.