a2a.client.transports.base module

class a2a.client.transports.base.ClientTransport

Bases: ABC

Abstract base class for a client transport.

abstractmethod async cancel_task(request: TaskIdParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → Task

Requests the agent to cancel a specific task.

abstractmethod async close() → None

Closes the transport.

abstractmethod async get_card(*, context: ClientCallContext | None = None, extensions: list[str] | None = None, signature_verifier: Callable[[AgentCard], None] | None = None) → AgentCard

Retrieves the AgentCard.

abstractmethod async get_task(request: TaskQueryParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → Task

Retrieves the current state and history of a specific task.

abstractmethod async get_task_callback(request: GetTaskPushNotificationConfigParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → TaskPushNotificationConfig

Retrieves the push notification configuration for a specific task.

abstractmethod async resubscribe(request: TaskIdParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → AsyncGenerator[Task | Message | TaskStatusUpdateEvent | TaskArtifactUpdateEvent]

Reconnects to get task updates.

abstractmethod async send_message(request: MessageSendParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → Task | Message

Sends a non-streaming message request to the agent.

abstractmethod async send_message_streaming(request: MessageSendParams, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → AsyncGenerator[Message | Task | TaskStatusUpdateEvent | TaskArtifactUpdateEvent]

Sends a streaming message request to the agent and yields responses as they arrive.

abstractmethod async set_task_callback(request: TaskPushNotificationConfig, *, context: ClientCallContext | None = None, extensions: list[str] | None = None) → TaskPushNotificationConfig

Sets or updates the push notification configuration for a specific task.