Add A2A (Agent-to-Agent) protocol support

src/bedrock_agentcore/runtime/__init__.py

@@ -1,19 +1,48 @@
 """BedrockAgentCore Runtime Package.
 
 This package contains the core runtime components for Bedrock AgentCore applications:
-- BedrockAgentCoreApp: Main application class
+- BedrockAgentCoreApp: Main application class for HTTP protocol
+- BedrockAgentCoreA2AApp: Application class for A2A (Agent-to-Agent) protocol
 - RequestContext: HTTP request context
 - BedrockAgentCoreContext: Agent identity context
+- AgentCard, AgentSkill: A2A protocol metadata models
 """
 
+from .a2a_app import BedrockAgentCoreA2AApp
+from .a2a_models import (
+    A2A_DEFAULT_PORT,
+    A2AArtifact,
+    A2AMessage,
+    A2AMessagePart,
+    AgentCard,
+    AgentSkill,
+    JsonRpcErrorCode,
+    JsonRpcRequest,
+    JsonRpcResponse,
+    build_runtime_url,
+)
 from .agent_core_runtime_client import AgentCoreRuntimeClient
 from .app import BedrockAgentCoreApp
 from .context import BedrockAgentCoreContext, RequestContext
 from .models import PingStatus
 
 __all__ = [
+    # HTTP Protocol
     "AgentCoreRuntimeClient",
     "BedrockAgentCoreApp",
+    # A2A Protocol
+    "BedrockAgentCoreA2AApp",
+    "AgentCard",
+    "AgentSkill",
+    "A2AMessage",
+    "A2AMessagePart",
+    "A2AArtifact",
+    "JsonRpcRequest",
+    "JsonRpcResponse",
+    "JsonRpcErrorCode",
+    "A2A_DEFAULT_PORT",
+    "build_runtime_url",
+    # Common
     "RequestContext",
     "BedrockAgentCoreContext",
     "PingStatus",