Struct Task 

pub struct Task {
    pub id: String,
    pub status: TaskStatus,
    pub input: Message,
    pub artifacts: Vec<Artifact>,
    pub history: Vec<Message>,
    pub error: Option<TaskError>,
    pub created_at: DateTime<Utc>,
    pub updated_at: Option<DateTime<Utc>>,
    pub context_id: Option<String>,
}

A task in the A2A protocol

Tasks represent asynchronous operations performed by agents. They have a lifecycle from submitted to completion, with various intermediate states.

Fields

id: String

Unique identifier for the task

status: TaskStatus

Current status of the task

input: Message

Input message that created this task

artifacts: Vec<Artifact>

Artifacts produced by this task (replaces legacy ‘output’ field)

history: Vec<Message>

Message exchange history for this task

error: Option<TaskError>

Error information (present if task failed)

created_at: DateTime<Utc>

When the task was created

updated_at: Option<DateTime<Utc>>

When the task was last updated

context_id: Option<String>

Optional context ID for grouping related tasks/messages

Implementations

impl Task

pub fn new(id: impl Into<String>, input: Message) -> Self

Create a new task

pub fn is_terminal(&self) -> bool

Check if the task is in a terminal state

pub fn is_processing(&self) -> bool

Check if the task is still processing

pub fn requires_input(&self) -> bool

Check if the task requires input

pub fn with_status(self, status: TaskStatus) -> Self

Update the task status

pub fn with_artifact(self, artifact: Artifact) -> Self

Add an artifact to the task

pub fn with_history_message(self, message: Message) -> Self

Add a message to the history

pub fn with_error(self, error: TaskError) -> Self

Set the task error

pub fn with_context_id(self, context_id: impl Into<String>) -> Self

Set the context ID

Trait Implementations

impl Clone for Task

fn clone(&self) -> Task

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Task

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Task

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Task

fn eq(&self, other: &Task) -> 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 Task

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 Task