> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Apply Config Defaults • AI Agent SDK
> apply_config_defaults: Apply config defaults to a parameter if not explicitly set.
# apply\_config\_defaults
Function
> This function is defined in the [**loader**](../modules/loader) module.
Apply config defaults to a parameter if not explicitly set.
## Signature
```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def apply_config_defaults(param_name: str, explicit_value: Any, config_class: Optional[type]) -> Any
```
## Parameters
Name of the parameter (e.g., "memory", "knowledge")
Value explicitly passed by user (None if not set)
Optional config class to instantiate
### Returns
Resolved value with config defaults applied
## Usage
```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
# User passes memory=True, config has memory.backend="postgres"
# Result: MemoryConfig with backend="postgres"
memory = apply_config_defaults("memory", True, MemoryConfig)
```
## Uses
* `get_default`
* `config_class`
## Source
`praisonaiagents/config/loader.py` at line 563
***
## Related Documentation