Struct Message 

#[non_exhaustive]
pub struct Message {
    pub id: String,
    pub kind: String,
    pub role: Role,
    pub content: Vec<ContentBlock>,
    pub model: ModelId,
    pub stop_reason: Option<StopReason>,
    pub stop_sequence: Option<String>,
    pub stop_details: Option<StopDetails>,
    pub usage: Usage,
    pub context_management: Option<ResponseContextManagement>,
    pub container: Option<ContainerInfo>,
}

A complete (non-streaming) Messages-API response.

Usually produced by the SDK from a wire payload rather than built by hand. Tests that need a fixture should round-trip a JSON literal through serde_json::from_value.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

id: String

Unique message identifier (e.g. msg_01ABC...).

kind: String

Wire type discriminant. Always "message" for non-streaming responses; retained on the struct for full round-trip fidelity.

role: Role

Author of the message. Always Role::Assistant for responses.

content: Vec<ContentBlock>

Ordered list of content blocks the model produced.

model: ModelId

The model that produced this response.

stop_reason: Option<StopReason>

Why the model stopped, when known.

stop_sequence: Option<String>

The stop sequence that triggered termination, if applicable.

stop_details: Option<StopDetails>

Structured information about why the model stopped (e.g. for refusal stops, the policy category and an explanation). None when no extra detail is reported.

usage: Usage

Token usage and related counters.

context_management: Option<ResponseContextManagement>

Context-management edits applied to the request (e.g. trimmed thinking blocks or tool-use history). Present only when a context-management strategy was active and triggered.

container: Option<ContainerInfo>

Container metadata, present when the request used the code-execution container tool.

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.

impl<'de> Deserialize<'de> for Message

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Message

fn eq(&self, other: &Message) -> 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 Serialize for Message

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Message