Atuin AI with self-hosting

When I hit ? I get:

❯ Error: No API token provided in ai.api_token settings or command line argument.

Location:
    crates/atuin-ai/src/commands/inline.rs:63:13

The docs at Settings - Atuin Documentation only say:

api_token
Default: null

The API token for the Atuin AI endpoint. Used for AI features like command generation. Most users will not need this setting; it is only necessary for custom AI endpoints.

Not sure what to do. There’s no mention of LLM providers that I can find.