Macro routes 

macro_rules! routes {
    ($($operation:ident),* $(,)?) => { ... };
}

Collects annotated handlers into the operation list an application is built from.

let app = ExecutableApp::new(routes![create_user, read_user, delete_user])?;

Registration is explicit on purpose: there is no route scan and no inventory. A handler that is written but not listed here is not served, and does not appear in the contract, in OpenAPI, in the generated documentation, or as an MCP tool. Listing the same operation twice, or two operations that collide on method and path or on operation id, fails when the application is built rather than at the first request.