Enum StreamChunk 

pub enum StreamChunk {
    Text(String),
    ToolCall(ToolCall),
    ToolCallDelta {
        id: String,
        content: ToolCallDeltaContent,
    },
    Reasoning(Reasoning),
    ReasoningDelta {
        id: Option<String>,
        text: String,
    },
    Final(FinalResponse),
}

One streamed item of a completion response.

Deltas stream incremental UI-facing content; the non-delta variants (ToolCall, Reasoning) carry the complete block to be recorded in history. A well-formed stream ends with Final (though providers may terminate without one, e.g. on network errors).

Variants

Text(String)

A chunk of assistant text.

ToolCall(ToolCall)

A complete tool call (all arguments accumulated).

ToolCallDelta

An incremental piece of an in-progress tool call.

Fields

id: String

Provider-supplied tool call id.

content: ToolCallDeltaContent

Reasoning(Reasoning)

A complete reasoning block.

ReasoningDelta

A chunk of reasoning text.

Fields

id: Option<String>

text: String

Final(FinalResponse)

The final chunk, carrying the completion’s token usage (if the provider reports it).

Trait Implementations

impl Clone for StreamChunk

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamChunk

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for StreamChunk

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for StreamChunk

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for StreamChunk

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for StreamChunk