Struct CancelledNotificationParams 

pub struct CancelledNotificationParams {
    pub meta: Option<Map<String, Value>>,
    pub reason: Option<String>,
    pub request_id: Option<RequestId>,
}

Parameters for a notifications/cancelled notification.

JSON schema

{
 "description": "Parameters for a notifications/cancelled notification.",
 "type": "object",
 "properties": {
   "_meta": {
     "description": "See [General fields: _meta](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on _meta usage.",
     "type": "object",
     "additionalProperties": {}
   },
   "reason": {
     "description": "An optional string describing the reason for the cancellation. This MAY be logged or presented to the user.",
     "type": "string"
   },
   "requestId": {
     "description": "The ID of the request to cancel.\n\nThis MUST correspond to the ID of a request previously issued in the same direction.\nThis MUST be provided for cancelling non-task requests.\nThis MUST NOT be used for cancelling tasks (use the tasks/cancel request instead).",
     "$ref": "#/$defs/RequestId"
   }
 }
}

Fields

meta: Option<Map<String, Value>>

See General fields: _meta for notes on _meta usage.

reason: Option<String>

An optional string describing the reason for the cancellation. This MAY be logged or presented to the user.

request_id: Option<RequestId>

The ID of the request to cancel. This MUST correspond to the ID of a request previously issued in the same direction. This MUST be provided for cancelling non-task requests. This MUST NOT be used for cancelling tasks (use the tasks/cancel request instead).

Trait Implementations

impl Clone for CancelledNotificationParams

fn clone(&self) -> CancelledNotificationParams

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CancelledNotificationParams

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

Formats the value using the given formatter.

impl Default for CancelledNotificationParams

fn default() -> CancelledNotificationParams

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CancelledNotificationParams

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CancelledNotificationParams

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

where __S: Serializer,

Serialize this value into the given Serde serializer.