Struct StreamChunk 

pub struct StreamChunk {
    pub delta: String,
    pub done: bool,
    pub finish_reason: Option<FinishReason>,
    pub usage: Option<Usage>,
    pub tool_calls: Option<Vec<ToolCall>>,
}

A single chunk from a streaming response.

Fields

delta: String

The text delta for this chunk (may be empty for the final chunk).

done: bool

Set to true when the stream is complete.

finish_reason: Option<FinishReason>

The provider-reported reason the stream stopped, when available. Populated on the terminal content chunk.

usage: Option<Usage>

Token usage for the request. Only populated on the terminal usage chunk, and only for providers that report usage while streaming.

tool_calls: Option<Vec<ToolCall>>

Tool calls reconstructed from the stream, surfaced on the terminal chunk for providers that support streaming tool calls. None for chunks that carry no tool calls (and for providers, such as Ollama, that do not reconstruct tool calls while streaming).

Trait Implementations

impl Clone for StreamChunk

fn clone(&self) -> StreamChunk

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 Default for StreamChunk

fn default() -> StreamChunk

Returns the “default value” for a type.

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 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.