Macro agent_executor 

macro_rules! agent_executor {
    ($ty:ty, |$ctx:ident, $queue:ident| async $body:block) => { ... };
    ($ty:ty,
        execute: |$ctx:ident, $queue:ident| async $exec_body:block,
        cancel: |$cctx:ident, $cqueue:ident| async $cancel_body:block
    ) => { ... };
}

Generates an AgentExecutor implementation from a closure-like syntax.

Basic usage (execute only)

use a2a_protocol_server::agent_executor;

struct MyAgent;

agent_executor!(MyAgent, |ctx, queue| async {
    // ctx: &RequestContext, queue: &dyn EventQueueWriter
    Ok(())
});

With cancel handler

use a2a_protocol_server::agent_executor;

struct CancelableAgent;

agent_executor!(CancelableAgent,
    execute: |ctx, queue| async { Ok(()) },
    cancel: |ctx, queue| async { Ok(()) }
);