Enum StreamEvent 

pub enum StreamEvent {
    TextDelta(String),
    ToolCallStart {
        id: String,
        name: String,
    },
    ToolCallDelta {
        id: String,
        arguments_delta: String,
    },
    ToolCallEnd {
        id: String,
    },
    ToolResult {
        id: String,
        content: String,
        is_error: bool,
    },
    Usage {
        iteration: usize,
        input_tokens: u32,
        output_tokens: u32,
        estimated_cost: f64,
    },
    Error(String),
    Done,
}

An event emitted during a streaming model response.

Variants

TextDelta(String)

A chunk of generated text.

ToolCallStart

A tool call is starting (name and ID known, arguments pending).

Fields

id: String

name: String

ToolCallDelta

A chunk of tool call arguments (JSON fragment).

Fields

id: String

arguments_delta: String

ToolCallEnd

A tool call’s arguments are complete and the tool will be executed.

Fields

id: String

ToolResult

A tool has produced its result.

Fields

id: String

content: String

is_error: bool

Usage

Token usage and cost for the current iteration.

Emitted after each model invocation completes (once per ReAct iteration). During streaming, token counts are estimated from character length (~4 chars/token).

Fields

iteration: usize

input_tokens: u32

output_tokens: u32

estimated_cost: f64

Error(String)

An error occurred during streaming (non-fatal; the stream may continue).

Done

The stream is complete.

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.