nat start mcp crashes when the workflow type is langgraph_wrapper

[rmkraus]

Version

1.7.x

Which installation method(s) does this occur on?

PyPi

Describe the bug.

front_end_plugin_worker.py:218 unconditionally accesses workflow.config.workflow.workflow_alias, but LanggraphWrapperConfig extends FunctionBaseConfig, not AgentBaseConfig — so the attribute doesn't exist and you get an AttributeError.

The goal was to wrap my LangGraph agent with NAT and then expose the agent as an MCP tool call. The goal was NOT to expose the tools inside of my LangGraph graph, just the agent.

Minimum reproducible example

workflow.yaml

llms:
  agent:
    _type: nim
    model: meta/llama-3.1-8b-instruct
    api_key: dummy

functions:
  current_datetime:
    _type: current_datetime

workflow:
  _type: langgraph_wrapper
  llm_name: agent
  graph: some.module:graph

general:
  front_end:
    _type: mcp
    host: 0.0.0.0
    port: 9901

Relevant log output

Click here to see error details

AttributeError: 'LanggraphWrapperConfig' object has no attribute 'workflow_alias'

Other/Misc.

No response

Code of Conduct

• I agree to follow the NeMo Agent Toolkit Code of Conduct
• I have searched the open bugs and have found no duplicates for this bug report