[Help] AgentCore Gateway - Outbound Auth Code Grant using Strand Agents

## Summary
I was following the [AgentCore-gateway/12-outbound-auth-code-grant](https://github.com/awslabs/amazon-bedrock-agentcore-samples/tree/main/01-tutorials/02-AgentCore-gateway/12-outbound-auth-code-grant) tutorial. Unfortunately, I wasn't able to perform the 3LO-Oauth of an AgentCore Gateway tool using Strands Agents.

## Details
Based on the above tutorial, I tried the following approach:
```python
from mcp.client.streamable_http import streamablehttp_client
from strands.tools.mcp.mcp_client import MCPClient
from strands import Agent

def create_streamable_http_transport():
return streamablehttp_client(gateway_url, headers={
"Authorization": f"Bearer {bearer_token}",
'MCP-Protocol-Version': '2025-11-25',
})
mcp_client = MCPClient(create_streamable_http_transport)

prompt = "Give me the LinkedIn user info"
with mcp_client:
tools = mcp_client.list_tools_sync()
print(f"Found tools: {[tool.tool_name for tool in tools]}")
agent = Agent(
name="tools-3l-oauth-agent",
description="3L-Oauth MCP Tools agent.",
model="global.anthropic.claude-haiku-4-5-20251001-v1:0",
tools=tools,
)
response = agent(prompt)
```

The tool call fails as expected (I need to authenticate). However, it only sends the error message to the agent (`This request requires more information.`), but not the elicitation data (callback URL) that is retrieved by the MCP call.
```bash
2025-12-22 21:28:23,532 | INFO | httpx | HTTP Request: POST https://gateway-authcode-20251222-XXXXXX-vw088gz3mp.gateway.bedrock-agentcore.us-east-1.amazonaws.com/mcp "HTTP/1.1 200 OK"
2025-12-22 21:28:23,534 | INFO | mcp.client.streamable_http | Negotiated protocol version: 2025-11-25
2025-12-22 21:28:23,639 | INFO | httpx | HTTP Request: POST https://gateway-authcode-20251222-XXXXXX-vw088gz3mp.gateway.bedrock-agentcore.us-east-1.amazonaws.com/mcp "HTTP/1.1 202 Accepted"
2025-12-22 21:28:23,767 | INFO | httpx | HTTP Request: POST https://gateway-authcode-20251222-XXXXXX-vw088gz3mp.gateway.bedrock-agentcore.us-east-1.amazonaws.com/mcp "HTTP/1.1 200 OK"
Found tools: ['x_amz_bedrock_agentcore_search', 'LinkedInAuthCode___getUserInfo']

Tool #1: LinkedInAuthCode___getUserInfo
2025-12-22 21:28:25,331 | INFO | httpx | HTTP Request: POST https://gateway-authcode-20251222-XXXXXX-vw088gz3mp.gateway.bedrock-agentcore.us-east-1.amazonaws.com/mcp "HTTP/1.1 200 OK"
2025-12-22 21:28:25,333 | ERROR | strands.tools.mcp.mcp_client | tool execution failed
Traceback (most recent call last):
File "/opt/conda/lib/python3.12/site-packages/strands/tools/mcp/mcp_client.py", line 523, in call_tool_async
call_tool_result: MCPCallToolResult = await asyncio.wrap_future(future)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/strands/tools/mcp/mcp_client.py", line 761, in run_async
return await invoke_event
^^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/strands/tools/mcp/mcp_client.py", line 517, in _call_tool_async
return await cast(ClientSession, self._background_thread_session).call_tool(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/mcp/client/session.py", line 383, in call_tool
result = await self.send_request(
^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/mcp/shared/session.py", line 306, in send_request
raise McpError(response_or_error.error)
mcp.shared.exceptions.McpError: This request requires more information.
```

What is the proper way to perform the 3LO-Oauth of an AgentCore Gateway tool using Strands Agents? An additional tutorial addressing this case would be awesome!