Macro rrag_tool 

macro_rules! rrag_tool {
    (
        name: $name:expr,
        description: $desc:expr,
        execute: $exec:expr
    ) => { ... };
    (
        name: $name:expr,
        description: $desc:expr,
        category: $category:expr,
        execute: $exec:expr
    ) => { ... };
}

Macro for creating simple tools with less boilerplate