Get Small Model • AI Agent SDK

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This function is defined in the loader module.

Resolve the auxiliary/”small” model for cheap internal LLM calls.

Resolution order:

1. `defaults.small_model (or the equivalent agent.small_model` CLI
2. namespace) from the config file, if set.
3. The supplied `primary_model` (e.g. the running agent’s model).
4. `defaults.model (or agent.model`) from the config file, if set.
5. `fallback` (preserves today’s hardcoded behaviour when nothing else
6. is configured).

Both the `defaults. (typed loader) and agent. (CLI resolver / JSON schema) namespaces are honoured because they read the same config file; a user following schema autocomplete (agent.small_model`) is therefore not silently ignored.

This keeps internal calls (title generation, summarisation/compaction) on a configured cheap model, and — when unset — on the primary model rather than a hardcoded third-party default.

Signature

def get_small_model(primary_model: Optional[str], fallback: Optional[str]) -> Optional[str]

Parameters

Returns

Uses

• get_default

Source