fix: move MCPClient imports inside try block, add TOOLS.md placeholder

agentclaw/app/agent_claw_main/main.py

@@ -5,8 +5,6 @@ Entrypoint for AgentCore CodeZip deployment.
 """
 import os
 from strands import Agent, tool
-from strands.tools.mcp import MCPClient
-from mcp.client.streamable_http import streamablehttp_client
 from strands.models import BedrockModel
 from bedrock_agentcore.runtime import BedrockAgentCoreApp
 
@@ -470,13 +468,17 @@ async def main(payload: dict, context):
     _aws_mcp_client = None
     _aws_mcp_tools = []
     try:
+        from strands.tools.mcp import MCPClient
+        from mcp.client.streamable_http import streamablehttp_client
         _aws_mcp_client = MCPClient(
             lambda: streamablehttp_client(config.AWS_MCP_URL, auth=_AwsMcpSigV4Auth())
         )
         _aws_mcp_client.start()
         _aws_mcp_tools = [_aws_mcp_client]
     except Exception as _e:
-        print(f'[main] AWS MCP client failed to start: {_e}')
+        import traceback
+        print(f"[main] AWS MCP client failed to start: {type(_e).__name__}: {_e}")
+        print(traceback.format_exc())
 
     all_tools = base_tools + mcp_clients + _aws_mcp_tools