Function validate_model 

pub async fn validate_model(
    provider: &dyn TokenProvider,
    provider_name: &str,
    model_id: &str,
) -> Result<bool>

Validates if a model exists for a provider.

This function checks if a specific model identifier is available for a provider, using the cached model registry with automatic caching.

Arguments

• provider - Token provider for API credentials
• provider_name - Name of the provider (e.g., “openrouter”, “gemini”)
• model_id - Model identifier to validate

Returns

true if the model exists, false otherwise.

Errors

Returns an error if:

• Provider is not found
• API request fails
• Response parsing fails