Function dispatch_tool 

pub fn dispatch_tool<'a, E: Env>(
    env: &'a E,
    name: &'a str,
    args: &'a str,
    agent: &'a str,
    sender: &'a str,
    conversation_id: Option<u64>,
) -> ToolFuture<'a>

Dispatch a tool call through an Env’s hook. Utility for Env implementors building their ToolDispatcher impl.