Enum StreamDelta 

pub enum StreamDelta {
    TextDelta {
        delta: String,
        block_index: usize,
    },
    ThinkingDelta {
        delta: String,
        block_index: usize,
    },
    ToolUseStart {
        id: String,
        name: String,
        block_index: usize,
    },
    ToolInputDelta {
        id: String,
        delta: String,
        block_index: usize,
    },
    Usage(Usage),
    Done {
        stop_reason: Option<StopReason>,
    },
    Error {
        message: String,
        recoverable: bool,
    },
}

Events yielded during streaming LLM responses.

Each variant represents a different type of event that can occur during a streaming response from an LLM provider.

Variants

TextDelta

A text delta for streaming text content.

Fields

delta: String

The text fragment to append

block_index: usize

Index of the content block being streamed

ThinkingDelta

A thinking delta for streaming thinking/reasoning content.

Fields

delta: String

The thinking fragment to append

block_index: usize

Index of the content block being streamed

ToolUseStart

Start of a tool use block (name and id are known).

Fields

id: String

Unique identifier for this tool call

name: String

Name of the tool being called

block_index: usize

Index of the content block

ToolInputDelta

Incremental JSON for tool input (partial/incomplete JSON).

Fields

id: String

Tool call ID this delta belongs to

delta: String

JSON fragment to append

block_index: usize

Index of the content block

Usage(Usage)

Usage information (typically at stream end).

Done

Stream completed with stop reason.

Fields

stop_reason: Option<StopReason>

Why the stream ended

Error

Error during streaming.

Fields

message: String

Error message

recoverable: bool

Whether the error is recoverable (e.g., rate limit)

Trait Implementations

impl Clone for StreamDelta

fn clone(&self) -> StreamDelta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamDelta

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

Formats the value using the given formatter.