Middleware

When using BYO-server mode, you can add any middleware supported by the framework.

Axum Example

use tower_http::cors::CorsLayer;

let app = Router::new()
    .merge(mcp_routes(state, &mount_opts, http_handler))
    .layer(CorsLayer::permissive())
    .layer(TraceLayer::new_for_http());

Actix Example

use actix_cors::Cors;

HttpServer::new(move || {
    App::new()
        .wrap(Cors::permissive())
        .service(mcp_scope(state.clone(), http_handler.clone(), &mount_opts))
})
.bind("127.0.0.1:8080")?
.run()
.await?;

When using create_axum_server() (non BYO-server), the SDK creates its own router internally. For custom middleware, use BYO-server mode.