Struct MessageDelta 

pub struct MessageDelta {
    pub delta: MessageDeltaPayload,
    pub usage: Option<Usage>,
}

A delta update for the message, typically emitted at the end of the stream.

Carries the final StreamStopReason (why the model stopped) and the cumulative Usage statistics for the entire request. Emitted after all parts are complete but before MessageStop.

Example

use loopctl::stream::{MessageDelta, MessageDeltaPayload, Usage};

let delta = MessageDelta {
    delta: MessageDeltaPayload { stop_reason: Some("end_turn".to_string()) },
    usage: Some(Usage::new(100, 50)),
};

Relationship to MessageDeltaPayload

The delta field contains the stop reason string, while the usage field carries token counts. Together they provide the final summary of the streaming response.

Fields

delta: MessageDeltaPayload

The delta details containing the stop reason.

See MessageDeltaPayload for the payload structure. Use StreamStopReason::from_api_str to parse the stop reason string into a typed enum.

usage: Option<Usage>

Token usage statistics for this request.

Some when the API reports usage; None if usage data is not available or not yet received. See Usage. Typically populated in the final MessageDelta event and reflects cumulative token consumption for the entire request.

Trait Implementations

impl Clone for MessageDelta

fn clone(&self) -> MessageDelta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageDelta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MessageDelta

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MessageDelta

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

where __S: Serializer,

Serialize this value into the given Serde serializer.