Function send_chat_request_with_tool_execution 

pub async fn send_chat_request_with_tool_execution(
    client: &LLMClient,
    model: &str,
    prompt: &str,
    history: &[ChatEntry],
    system_prompt: Option<&str>,
    max_tokens: Option<u32>,
    temperature: Option<f32>,
    _provider_name: &str,
    tools: Option<Vec<Tool>>,
    mcp_server_names: &[&str],
) -> Result<(String, Option<i32>, Option<i32>)>