A2A JSON-RPC endpoint

A2A JSON-RPC 2.0 endpoint. The method field selects the operation; params must match that method's schema (see the oneOf below).

Supported methods:

• SendMessage — Send a message to the agent (returns a Task or response Message).
• SendStreamingMessage — Send a message and receive a Server-Sent Events stream.
• GetTask — Fetch a task by ID.
• ListTasks — List tasks with pagination and filtering.
• CancelTask — Cancel an in-progress task.
• CreateTaskPushNotificationConfig — Register a push-notification config on a task.
• GetTaskPushNotificationConfig — Read a single push-notification config.
• ListTaskPushNotificationConfigs — List all push-notification configs for a task.
• DeleteTaskPushNotificationConfig — Delete a push-notification config.
• SubscribeToTask — Subscribe to task events via Server-Sent Events.
• GetExtendedAgentCard — Fetch the authenticated extended agent card.