Struct Message 

pub struct Message {
    pub message_id: String,
    pub context_id: Option<String>,
    pub task_id: Option<String>,
    pub role: Role,
    pub parts: Vec<Part>,
    pub metadata: Option<Value>,
    pub extensions: Vec<String>,
    pub reference_task_ids: Vec<String>,
}

A2A Message (proto message Message) — one unit of client/server communication. messageId and role are spec-REQUIRED on send, and parts MUST contain at least one Part (spec §5.7 REQUIRED — a list field with REQUIRED behavior must have ≥1 element).

Fields

message_id: String

context_id: Option<String>

task_id: Option<String>

role: Role

parts: Vec<Part>

metadata: Option<Value>

extensions: Vec<String>

reference_task_ids: Vec<String>

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<'de>>(deserializer: D) -> Result<Self, D::Error>

Enforce spec REQUIRED invariants: role must not be ROLE_UNSPECIFIED (the 0-value means “not set”), and parts must be non-empty (≥1 Part). A missing messageId/role/parts field fails at the serde level (no #[serde(default)]); this layer rejects present-but-empty values.

impl JsonSchema for Message

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for Message

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

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