Enum AssistantStreamChunk 

pub enum AssistantStreamChunk {
    Text {
        delta: String,
    },
    Thinking {
        delta: String,
    },
    Reasoning {
        delta: String,
    },
    ReasoningDetails {
        delta: Vec<Value>,
    },
    ToolCallDelta {
        index: usize,
        id_delta: Option<String>,
        name_delta: Option<String>,
        arguments_delta: Option<String>,
    },
}

One token-level chunk during streaming.

Apps render these as deltas. The loop ignores them (it only looks at Start for the placeholder and Done / Error for the assembled final message).

Variants

Text

Text being appended to the visible assistant content.

Fields

delta: String

Thinking

Hidden reasoning being appended (think-then-act block).

Fields

delta: String

Reasoning

Native provider reasoning being appended.

Fields

delta: String

ReasoningDetails

Native provider reasoning detail blocks being appended.

Fields

delta: Vec<Value>

ToolCallDelta

Tool call accumulating: arguments JSON streaming in piece by piece.

Fields

index: usize

id_delta: Option<String>

name_delta: Option<String>

arguments_delta: Option<String>

Trait Implementations

impl Clone for AssistantStreamChunk

fn clone(&self) -> AssistantStreamChunk

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AssistantStreamChunk

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AssistantStreamChunk

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for AssistantStreamChunk

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

where __S: Serializer,

Serialize this value into the given Serde serializer.