[Bug] Error with system message when using Google AI model in AI Agent node

Questions
1

Describe the problem/error/question

Hi n8n team,

I’m encountering an issue when using Google AI models (such as PaLM or Gemini) in the AI Agent node.

When I include a system message in the chat memory, I get the following error from the model:

[ERROR: System message should be the first one]

:white_check_mark: Expected:

The system message should be accepted as long as it’s configured correctly in the chat memory.

:cross_mark: What happens:

Even when the system message is set properly, the model returns this error. It seems like the message is not being placed as the first item in the message array before being sent to the Google API.

:magnifying_glass_tilted_right: Notes:

  • This issue only affects Google AI models.
  • According to Google’s documentation, the system message must be the first message in the array.
  • When using OpenAI models, the same configuration works fine and no error is thrown.
  • It appears that a user message is being inserted before the system message, which causes the error.

Thanks in advance for your attention!
Let me know if you need more details or logs.

What is the error message (if any)?

[ERROR: System message should be the first one]

Please share your workflow

Share the output returned by the last node

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