Struct ClientNotification 

pub struct ClientNotification {
    pub params: CancelledNotificationParams,
    /* private fields */
}

Latest MCP Protocol 2026_07_28 This notification is sent by the client to indicate that it is cancelling a request it previously issued. On stdio, the server also sends this notification, solely to terminate a {@link SubscriptionsListenRequestsubscriptions/listen} stream: it references the ID of the subscriptions/listen request that opened the stream. Servers MUST NOT use this notification to cancel any other request. The request SHOULD still be in-flight, but due to communication latency, it is always possible that this notification MAY arrive after the request has already finished. This notification indicates that the result will be unused, so any associated processing SHOULD cease.

JSON schema

{
 "description": "This notification is sent by the client to indicate that it is cancelling a request it previously issued.\n\nOn stdio, the server also sends this notification, solely to terminate a {@link SubscriptionsListenRequestsubscriptions/listen} stream: it references the ID of the subscriptions/listen request that opened the stream. Servers MUST NOT use this notification to cancel any other request.\n\nThe request SHOULD still be in-flight, but due to communication latency, it is always possible that this notification MAY arrive after the request has already finished.\n\nThis notification indicates that the result will be unused, so any associated processing SHOULD cease.",
 "type": "object",
 "required": [
   "jsonrpc",
   "method",
   "params"
 ],
 "properties": {
   "jsonrpc": {
     "type": "string",
     "const": "2.0"
   },
   "method": {
     "type": "string",
     "const": "notifications/cancelled"
   },
   "params": {
     "$ref": "#/$defs/CancelledNotificationParams"
   }
 }
}

Fields

params: CancelledNotificationParams

Implementations

impl ClientNotification

pub fn new(params: CancelledNotificationParams) -> Self

pub fn jsonrpc(&self) -> &String

pub fn method(&self) -> &String

pub fn method_value() -> &'static str

returns “notifications/cancelled”

pub fn method_name() -> &'static str

👎Deprecated since 0.8.0:

Use method_value() instead.

Trait Implementations

impl Clone for ClientNotification

fn clone(&self) -> ClientNotification

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ClientNotification

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ClientNotification

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ClientNotification

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.