Enum StreamChunk 

#[non_exhaustive]
pub enum StreamChunk {
    Text {
        step_index: u32,
        text: String,
    },
    Thought {
        step_index: u32,
        text: String,
    },
    ToolCall(ToolCall),
    ToolResult(ToolResult),
}

A single semantic event emitted while a turn is in flight.

Text and Thought carry incremental deltas (already split into human-readable chunks). ToolCall and ToolResult carry strongly typed dispatches so consumers can render spinners without parsing JSON.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Text

Incremental conversational text delta.

Fields

step_index: u32

Index of the step that produced this chunk.

text: String

The text fragment.

Thought

Incremental reasoning/thinking delta.

Fields

step_index: u32

Index of the step that produced this chunk.

text: String

The thinking fragment.

ToolCall(ToolCall)

The model is requesting a tool call.

ToolResult(ToolResult)

A tool call completed with a result.

Trait Implementations

impl Clone for StreamChunk

fn clone(&self) -> StreamChunk

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamChunk

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

Formats the value using the given formatter.

impl PartialEq for StreamChunk

fn eq(&self, other: &StreamChunk) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for StreamChunk