Enum StreamingChoice 

pub enum StreamingChoice {
    Message(String),
    ToolCall {
        id: String,
        name: String,
        arguments: Value,
    },
    ParallelToolCalls(HashMap<usize, ToolCall>),
    Thought(String),
    Usage(Usage),
    Done,
}

A chunk from a streaming response

Variants

Message(String)

Text content chunk

ToolCall

Single tool call (sequential)

Fields

id: String

Tool call ID

name: String

Tool name

arguments: Value

Arguments as JSON

ParallelToolCalls(HashMap<usize, ToolCall>)

Multiple tool calls (parallel)

Thought(String)

Thinking/reasoning chunk (e.g., Gemini’s thoughts)

Usage(Usage)

Usage information (emitted at the end)

Done

Stream finished

Implementations

impl StreamingChoice

pub fn is_message(&self) -> bool

Check if this is a message chunk

pub fn is_tool_call(&self) -> bool

Check if this is a tool call

pub fn is_done(&self) -> bool

Check if stream is done

pub fn as_message(&self) -> Option<&str>

Get message text if this is a message chunk

Trait Implementations

impl Clone for StreamingChoice

fn clone(&self) -> StreamingChoice

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamingChoice

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

Formats the value using the given formatter.