Struct MessageChunk 

pub struct MessageChunk {
    pub role: Option<Role>,
    pub content: String,
    pub tool_call_chunks: Vec<ToolCallChunk>,
    pub usage: Option<TokenUsage>,
}

Streaming message chunk

Represents incremental data from streaming LLM responses. Chunks must be accumulated to reconstruct the complete message.

Fields

role: Option<Role>

Message role (may be empty in early chunks)

content: String

Text content delta

tool_call_chunks: Vec<ToolCallChunk>

Tool call chunks (using args_delta field name from stream module)

usage: Option<TokenUsage>

Token usage (only in final chunk)

Trait Implementations

impl Clone for MessageChunk

fn clone(&self) -> MessageChunk

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageChunk

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

Formats the value using the given formatter.