Function generate_object 

pub async fn generate_object<T>(
    provider: &dyn DynProvider,
    params: ChatParams,
    config: GenerateObjectConfig,
) -> Result<GenerateObjectResult<T>, LlmError>
where
    T: DeserializeOwned + JsonSchema,

Generates a typed object from the LLM with schema validation.

1. Derives a JSON Schema from T (via schemars)
2. Sets structured_output on ChatParams
3. Calls the provider
4. Parses the response text as JSON
5. Validates against the schema
6. Deserializes to T

Retries up to config.max_attempts times on parse/validation failures. On retry, the model’s invalid response and the validation error are appended to the message history so the model can self-correct.

Errors

Returns LlmError if:

• max_attempts is 0
• The schema cannot be derived from T
• The provider returns an error (propagated immediately, not retried)
• All attempts fail validation (returns the last validation error)