Struct MessageMeta 

pub struct MessageMeta {
    pub progress_token: Option<ProgressToken>,
    pub extra: Option<Map<String, Value>>,
}

See General fields: _meta for notes on _meta usage.

JSON schema

{
 "description": "See [General fields: _meta](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on _meta usage.",
 "type": "object",
 "properties": {
   "progressToken": {
     "description": "If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.",
     "$ref": "#/$defs/ProgressToken"
   }
 },
 "additionalProperties": {}
}

Fields

progress_token: Option<ProgressToken>

If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.

extra: Option<Map<String, Value>>

Trait Implementations

impl Clone for MessageMeta

fn clone(&self) -> MessageMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageMeta

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

Formats the value using the given formatter.

impl Default for MessageMeta

fn default() -> MessageMeta

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MessageMeta

fn deserialize<__D>( __deserializer: __D, ) -> Result<MessageMeta, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MessageMeta

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

where __S: Serializer,

Serialize this value into the given Serde serializer.