# accept(incomingMessageHandler:cancellationHandler:) Accepts an incoming session request from a client using closures to handle encodable messages or cancellation, and returns the inactive session. ``` @preconcurrency func accept(incomingMessageHandler: @escaping @Sendable (Message) -> (any Encodable)?, cancellationHandler: (@Sendable (XPCRichError) -> Void)? = nil) -> XPCListener.IncomingSessionRequest.Decision where Message : Decodable ``` ## Parameters `incomingMessageHandler` A closure that receives incoming messages from a client. `cancellationHandler` An optional closure that the system invokes when it cancels the session. ## Return Value A decision that indicates whether the listener accepts or rejects the incoming session. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)