Enum StreamEvent 

pub enum StreamEvent {
    ContentChunk(String),
    ToolCallStart {
        id: String,
        name: String,
    },
    ToolCallDelta {
        id: String,
        delta: Value,
    },
    ToolCallResult {
        id: String,
        output: Value,
    },
    FinalAnswer(String),
    Metadata {
        key: String,
        value: Value,
    },
    AwaitingApproval {
        run_id: String,
        prompt: String,
        checkpoint_id: String,
    },
    ThinkingChunk(String),
    UsageUpdate {
        input_tokens: u32,
        output_tokens: u32,
        cache_read_tokens: Option<u32>,
        cache_write_tokens: Option<u32>,
    },
}

Variants

ContentChunk(String)

ToolCallStart

Fields

id: String

name: String

ToolCallDelta

Fields

id: String

delta: Value

ToolCallResult

Fields

id: String

output: Value

FinalAnswer(String)

Metadata

Fields

key: String

value: Value

AwaitingApproval

Emitted when an agent pauses at a human-in-the-loop approval gate.

The host application should present prompt to a human, collect their decision, and resume the graph from checkpoint_id.

Fields

run_id: String

Stable identifier for this execution run.

prompt: String

Human-readable description of what the agent wants to do.

checkpoint_id: String

Opaque checkpoint identifier — pass back to resume the graph.

ThinkingChunk(String)

Model reasoning / scratchpad text (Anthropic extended thinking, OpenAI o-series).

UsageUpdate

Token consumption update emitted after each LLM response.

Fields

input_tokens: u32

output_tokens: u32

cache_read_tokens: Option<u32>

cache_write_tokens: Option<u32>

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.

impl PartialEq for StreamEvent

fn eq(&self, other: &StreamEvent) -> 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 StreamEvent