Enum Method 

#[non_exhaustive]
pub enum Method {
    SendMessage,
    SendStreamingMessage,
    GetTask,
    ListTasks,
    CancelTask,
    SubscribeToTask,
    CreateTaskPushNotificationConfig,
    GetTaskPushNotificationConfig,
    ListTaskPushNotificationConfigs,
    DeleteTaskPushNotificationConfig,
    GetExtendedAgentCard,
}

One of the eleven A2A v1.0 service methods (spec §8).

The wire name is the PascalCase form used as the JSON-RPC method and as the final path segment of the gRPC full method name.

use a2a_protocol_types::method::Method;

assert_eq!(Method::ALL.len(), 11);
assert_eq!(Method::SendMessage.wire_name(), "SendMessage");
assert_eq!(Method::from_wire_name("GetTask"), Some(Method::GetTask));
assert_eq!(Method::from_wire_name("message/send"), None); // v0.3 spelling

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.

SendMessage

Send a message and wait for the response (spec §8.1).

SendStreamingMessage

Send a message and stream events as they occur (spec §8.2).

GetTask

Fetch a task by id (spec §8.3).

ListTasks

List tasks, with optional filters and pagination (spec §8.4).

CancelTask

Request cancellation of a task (spec §8.5).

SubscribeToTask

Re-attach to an existing task’s event stream (spec §8.6).

CreateTaskPushNotificationConfig

Create a push-notification config for a task (spec §8.7).

GetTaskPushNotificationConfig

Fetch one push-notification config (spec §8.8).

ListTaskPushNotificationConfigs

List a task’s push-notification configs (spec §8.9).

DeleteTaskPushNotificationConfig

Delete a push-notification config (spec §8.10).

GetExtendedAgentCard

Fetch the authenticated extended agent card (spec §8.11, §13.3).

Implementations

impl Method

pub const ALL: &'static [Method]

Every method, in spec order.

Mirrors service A2AService in proto/a2a_v1/a2a.proto and is checked against it by this module’s all_matches_the_ratified_proto test — see the module docs for why the denominator is the proto and not this slice.

Exhaustiveness is separately enforced by Method::wire_name’s match: adding a variant without adding it here fails all_variants_are_listed rather than silently shrinking every coverage denominator that iterates this slice.

pub const fn wire_name(self) -> &'static str

The PascalCase wire name.

pub fn from_wire_name(name: &str) -> Option<Method>

Resolves a wire name, exactly. The inverse of Method::wire_name.

Deliberately case-sensitive and exact: the v0.3 spellings (message/send, tasks/get) are not accepted, so a caller cannot half-migrate without noticing.

pub const fn is_streaming(self) -> bool

true for the two methods whose response is a stream of events rather than a single value.

pub const fn requires_push_capability(self) -> bool

true when the agent card must advertise pushNotifications for this method to be available (spec §3.1.11 — otherwise the server answers UnsupportedOperation).

pub const fn requires_streaming_capability(self) -> bool

true when the agent card must advertise streaming for this method to be available.

pub const fn requires_extended_card_capability(self) -> bool

true when the agent card must advertise extendedAgentCard.

Trait Implementations

impl Clone for Method

fn clone(&self) -> Method

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Method

impl Debug for Method

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

Formats the value using the given formatter.

impl Display for Method

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

Formats the value using the given formatter.

impl Eq for Method

impl Hash for Method

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Method

fn cmp(&self, other: &Method) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Method

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Method

fn partial_cmp(&self, other: &Method) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Method