Enum StreamEvent 

pub enum StreamEvent {
    TextDelta(StreamChunk),
    ToolCall(ToolCall),
    PreExecutedToolCall {
        name: String,
        args: String,
    },
    PreExecutedToolResult {
        name: String,
        output: String,
    },
    Usage(TokenUsage),
    Final,
}

Structured events emitted by provider streaming APIs.

This extends plain text chunk streaming with explicit tool-call signals so agent loops can preserve native tool semantics without parsing payload text.

Variants

TextDelta(StreamChunk)

Text delta from the assistant.

ToolCall(ToolCall)

Structured tool call emitted during streaming.

PreExecutedToolCall

A tool call that was already executed by the provider (e.g. Claude Code proxy). Emitted for observability only — not re-executed by the agent’s dispatcher.

Fields

name: String

args: String

PreExecutedToolResult

The result of a pre-executed tool call.

Fields

name: String

output: String

Usage(TokenUsage)

Provider-reported token usage for the current stream. Emitted before Final by providers that surface usage mid-stream (Anthropic via message_delta, OpenAI via stream_options.include_usage).

Final

Stream has completed.

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.