feat(client): transport agnostic interceptors

src/a2a/client/__init__.py

@@ -9,15 +9,21 @@
 )
 from a2a.client.base_client import BaseClient
 from a2a.client.card_resolver import A2ACardResolver
-from a2a.client.client import Client, ClientConfig, ClientEvent, Consumer
+from a2a.client.client import (
+    Client,
+    ClientCallContext,
+    ClientConfig,
+    ClientEvent,
+    Consumer,
+)
 from a2a.client.client_factory import ClientFactory, minimal_agent_card
 from a2a.client.errors import (
     A2AClientError,
     A2AClientTimeoutError,
     AgentCardResolutionError,
 )
 from a2a.client.helpers import create_text_message_object
-from a2a.client.middleware import ClientCallContext, ClientCallInterceptor
+from a2a.client.interceptors import ClientCallInterceptor
 
 
 logger = logging.getLogger(__name__)
@@ -30,9 +36,9 @@
     'AgentCardResolutionError',
     'AuthInterceptor',
     'BaseClient',
+    'CallInterceptor',
     'Client',
     'ClientCallContext',
-    'ClientCallInterceptor',
     'ClientConfig',
     'ClientEvent',
     'ClientFactory',

src/a2a/client/auth/credentials.py

@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 
-from a2a.client.middleware import ClientCallContext
+from a2a.client.client import ClientCallContext
 
 
 class CredentialService(ABC):

src/a2a/client/auth/interceptor.py

@@ -2,13 +2,13 @@
 from typing import Any
 
 from a2a.client.auth.credentials import CredentialService
-from a2a.client.middleware import ClientCallContext, ClientCallInterceptor
+from a2a.client.client import ClientCallContext
 from a2a.types.a2a_pb2 import AgentCard
 
 logger = logging.getLogger(__name__)
 
 
-class AuthInterceptor(ClientCallInterceptor):
+class AuthInterceptor:
     """An interceptor that automatically adds authentication details to requests.
 
     Based on the agent's security schemes.