[Bug]: Getting "KeyError('messages')" when calling agent completions HTTP API

[ddallabenetta]

Is there an existing issue for the same bug?

• I have checked the existing issues.

Branch name

main

Commit ID

df9d054

Other environment information

No response

Actual behavior

Can't use agents via api, since the completions api always return the following error:

By looking at the session.py code, I noticed that the session gets created with a 'message' field instead of a'messages' one. This may be the reason of the issue.

Expected behavior

Generate response from agent via HTTP API

Steps to reproduce

1. Create an agent
2. Call the HTTP request via POST /api/v1/agents/{agentId}/completions with the following body

{
    "stream": true,
    "question": "Hello?"
}

### Additional information

_No response_

[KevinHuSh]

Which LLM do you use?

[ddallabenetta]

I am using OpenAI gpt 4o mini. The api key is set and it’s working through the agent run web ui