# login

> **Function** in `deepagents_code`

📖 [View in docs](https://reference.langchain.com/python/deepagents-code/mcp_auth/login)

Drive OAuth login for `server_name`, persisting tokens on success.

## Signature

```python
login(
    *,
    server_name: str,
    server_config: McpServerSpec,
    ui: OAuthInteraction,
) -> None
```

## Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| `server_name` | `str` | Yes | Name of the configured MCP server. |
| `server_config` | `McpServerSpec` | Yes | Parsed server config for that entry. |
| `ui` | `OAuthInteraction` | Yes | Interaction surface for all user prompts and progress messages during the flow. |

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[View source on GitHub](https://github.com/langchain-ai/deepagents/blob/d1c6946218b4f0f86ab7b02b6bb6af1e4b75cede/libs/code/deepagents_code/mcp_auth.py#L1522)