Enum TaskState 

#[non_exhaustive]
pub enum TaskState {
    Submitted,
    Working,
    InputRequired,
    Completed,
    Failed,
    Canceled,
    Rejected,
    AuthRequired,
    Unknown,
}

Lifecycle state of an A2A task.

The state machine progresses roughly as: Submitted → Working → Completed (success) or Failed (error). InputRequired pauses processing until the caller sends more data. Terminal states (Completed, Failed, Canceled, Rejected) cannot be resumed.

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.

Submitted

Task has been received and queued but processing has not started.

Working

The agent is actively processing the task.

InputRequired

Processing is paused; the agent needs more input from the caller.

Completed

Task finished successfully. Terminal state.

Failed

Task encountered an unrecoverable error. Terminal state.

Canceled

Task was canceled by the caller. Terminal state.

Rejected

Task was rejected by the agent (e.g., policy violation). Terminal state.

AuthRequired

The agent requires authentication before proceeding.

Unknown

State could not be determined (e.g., deserialization of a future protocol version).

Trait Implementations

impl Clone for TaskState

fn clone(&self) -> TaskState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TaskState

impl Debug for TaskState

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TaskState

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for TaskState

impl PartialEq for TaskState

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

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 TaskState