Enum Message 

#[non_exhaustive]
pub enum Message {
    System {
        subtype: String,
        data: Value,
    },
    Assistant {
        message: AssistantMessage,
    },
    User {
        message: UserMessage,
    },
    Result {
        result: ResultMessage,
    },
    Unknown {
        message_type: String,
        raw: Value,
    },
}

A message from the Claude CLI streaming protocol.

The CLI emits newline-delimited JSON objects with a top-level type field. Each variant corresponds to one of these message types.

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.

System

System-level message (init acknowledgment, etc.)

Fields

subtype: String

data: Value

Assistant

Assistant (Claude) response message.

Fields

message: AssistantMessage

User

User message echo.

Fields

message: UserMessage

Result

Result/completion message - signals end of a turn.

Fields

result: ResultMessage

Unknown

An unknown message type we don’t recognize but preserve.

Fields

message_type: String

raw: Value

Implementations

impl Message

pub fn is_result(&self) -> bool

Returns true if this is a Result message (end of turn).

pub fn is_error(&self) -> bool

Returns true if this is a Result message with an error.

pub fn text(&self) -> Option<String>

Extract all text content from an Assistant message.

pub fn session_id(&self) -> Option<&str>

Get the session ID from a Result message.

Trait Implementations

impl Clone for Message

fn clone(&self) -> Message

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Message

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

Formats the value using the given formatter.