Enum SessionEvent 

pub enum SessionEvent {
    Connected,
    TextDelta(String),
    TextComplete(String),
    AudioData(Bytes),
    InputTranscription(String),
    OutputTranscription(String),
    Thought(String),
    ToolCall(Vec<FunctionCall>),
    ToolCallCancelled(Vec<String>),
    TurnComplete,
    GenerationComplete,
    Interrupted,
    PhaseChanged(SessionPhase),
    GoAway(Option<String>),
    Disconnected(Option<String>),
    Error(String),
    SessionResumeUpdate(ResumeInfo),
    VoiceActivityStart,
    VoiceActivityEnd,
    Usage(UsageMetadata),
}

Events emitted by the session, consumed by application code.

Variants

Connected

Session connected and setup complete.

TextDelta(String)

Incremental text from model response.

TextComplete(String)

Complete text of a finished model turn.

AudioData(Bytes)

Audio data from model response (PCM16 samples, base64-decoded).

Uses [bytes::Bytes] for zero-copy fan-out: cloning a Bytes handle bumps an Arc refcount instead of copying the underlying data.

InputTranscription(String)

Input transcription from server.

OutputTranscription(String)

Output transcription from server.

Thought(String)

Thought/reasoning summary from the model (when includeThoughts is enabled).

ToolCall(Vec<FunctionCall>)

Model requested tool calls.

ToolCallCancelled(Vec<String>)

Server cancelled pending tool calls.

TurnComplete

Model turn is complete (it’s the user’s turn now).

GenerationComplete

Model finished generating its full response.

Fires even if the generation was interrupted — tells you the model’s internal generation pipeline has stopped. Distinct from TurnComplete which is the turn-taking signal.

Interrupted

Model was interrupted by barge-in.

PhaseChanged(SessionPhase)

Session phase changed.

GoAway(Option<String>)

Server sent GoAway signal with optional time remaining.

Disconnected(Option<String>)

Session disconnected (with optional reason).

Error(String)

Non-fatal error.

SessionResumeUpdate(ResumeInfo)

Session resumption update with handle, resumability, and consumed index.

VoiceActivityStart

Server-side voice activity detected (user started speaking).

VoiceActivityEnd

Server-side voice activity ended (user stopped speaking).

Usage(UsageMetadata)

Token usage metadata from server (for context window tracking).

Contains full token breakdown: prompt, response, cached, tool-use, thinking tokens, plus per-modality details.

Trait Implementations

impl Clone for SessionEvent

fn clone(&self) -> SessionEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SessionEvent

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

Formats the value using the given formatter.