Enum StreamEvent 

pub enum StreamEvent {
    TextDelta(String),
    ReasoningDelta(String),
    ReasoningBlockStart,
    FunctionCallStart {
        index: usize,
        call_id: String,
        name: String,
    },
    FunctionCallDelta {
        index: usize,
        delta: String,
    },
    FunctionCallDone {
        index: usize,
        arguments: String,
    },
    UsageUpdate {
        usage: Option<Value>,
        stop_reason: Option<String>,
    },
    Done(Value),
    Error(String),
}

Events emitted during a streaming LLM response.

Variants

TextDelta(String)

A chunk of text content from the assistant.

ReasoningDelta(String)

A chunk of reasoning/thinking content.

ReasoningBlockStart

A new reasoning/thinking block is starting (used to insert separators between multiple interleaved thinking blocks in a single response).

FunctionCallStart

A new function/tool call is starting. Fields: (index, call_id, function_name)

Fields

index: usize

call_id: String

name: String

FunctionCallDelta

A chunk of function call arguments.

Fields

index: usize

delta: String

FunctionCallDone

Function call arguments are complete.

Fields

index: usize

arguments: String

UsageUpdate

Usage/metadata update (input_tokens, output_tokens, stop_reason).

Fields

usage: Option<Value>

stop_reason: Option<String>

Done(Value)

The complete response is available (streaming finished). Contains the full response body for final processing.

Error(String)

An error occurred during streaming.

Trait Implementations

impl Clone for StreamEvent

fn clone(&self) -> StreamEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamEvent

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

Formats the value using the given formatter.