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Getting CogniteAPIError while trying to chat with Atlas AI

  • February 27, 2026
  • 1 reply
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I have created and published an Atlas AI agent which I am able to use from CogniteUI. I tried to use this agent via Cognite SDK. I am able to list all agents and able to retrieve my agent. However, when I tried to send Message to my agent I got following error

client.agents.chat(agent_external_id= “external_id”, messages=  Message("Provide list of wells in Field"))

CogniteAPIError: Agents with tools that run on the client side are not supported for non-Fusion users. | code: 400 | X-Request-ID: 9eac0212-9f5f-9dd9-9372-7073768dc3e8 | cluster: westeurope-1 | project: ------

No idea what this means. Can you please help to fix it?

    1 reply

    Amman Siddiqi
    Practitioner
    • Amman Siddiqi
    • Practitioner
    • February 27, 2026

    Hi ​@spatidar !

    Thanks for reaching out! The error occurs because your agent is using tools—specifically Timeseries Analysis or Python Code Execution—that currently only function within the Fusion UI. Because these tools execute on the client side, they aren’t supported via the API yet.

    The Fix: Remove these specific tools from your agent’s configuration. Your current query will still work using the Query Knowledge Graph tool, which is fully supported via the API. We’re working on expanding API support for other tools, though we don't have a firm release date just yet.

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