Struct MessageEvent 

pub struct MessageEvent {
    pub text: String,
    pub model: Option<String>,
    pub id: Option<String>,
    pub reasoning: Option<String>,
    pub output_tokens: Option<u32>,
    pub input_tokens: Option<u32>,
    pub cache_read_tokens: Option<u32>,
    pub cache_write_tokens: Option<u32>,
}

A user.message, assistant.message, or system.message.

Fields

text: String

model: Option<String>

id: Option<String>

reasoning: Option<String>

Chain-of-thought (reasoningText on assistant messages).

output_tokens: Option<u32>

Output tokens attributed to this message (outputTokens).

input_tokens: Option<u32>

Input/prompt tokens, when present. Real Copilot sessions record only outputTokens per message; inputTokens/cache fields are read too so a projected session (from a harness that does carry them) round-trips.

cache_read_tokens: Option<u32>

cache_write_tokens: Option<u32>

Implementations

impl MessageEvent

pub fn token_usage(&self) -> Option<TokenUsage>

Per-message token usage, or None when no token field was present.

Trait Implementations

impl Clone for MessageEvent

fn clone(&self) -> MessageEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageEvent

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

Formats the value using the given formatter.

impl Default for MessageEvent

fn default() -> MessageEvent

Returns the “default value” for a type.