Function build_initial_messages

core/src/llm/structured.rs:926–950

(req: &StructuredRequest, mode: StructuredMode)

}

fn build_initial_messages(req: &StructuredRequest, mode: StructuredMode) -> Vec<Message> {
    match mode {
        StructuredMode::Tool => {
            // For tool mode, the prompt is the user message; the LLM will respond
            // with a tool call whose input is the structured object.
            vec![Message::user(&req.prompt)]
        }
        StructuredMode::Prompt | StructuredMode::Json => {
            // Prompt mode and json_object mode both need the schema in the prompt:
            // json_object only guarantees *syntactic* validity, so the model still
            // has to be told the shape it should produce.
            let augmented = format!(
                "{}\n\nYou MUST respond with ONLY a valid JSON object (no markdown, no explanation) that conforms to this JSON Schema:\n\n```json\n{}\n```",
                req.prompt,
                serde_json::to_string_pretty(&req.schema).unwrap_or_default()
            );
            vec![Message::user(&augmented)]
        }
        _ => {
            // Strict mode: the schema constraint is enforced by the provider via
            // response_format.json_schema, so the user message is just the prompt.
            vec![Message::user(&req.prompt)]
        }
    }
}

fn build_system_prompt(req: &StructuredRequest, mode: StructuredMode) -> String {
    let base = req.system.as_deref().unwrap_or("");