Help Needed: n8n API Error When Contacting Agent

Pauline Leroy · 2025-04-15 14:08:59.906354+00

Hi everyone! I have an issue that I can't solved. I'm trying to speak with one of my agent through n8n but I get this error all the time. And I'm sure this is the right workspace id. I'm using POST and URL to talk with the agent Any idea? :pray: Thanks a lot

Help Needed: n8n API Error When Contacting Agent | Dust Community

David Ebbo
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What does the body of your POST request look like?
Pauline Leroy
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{ "agentId": "xxx", "messages": [ { "role": "user", "content": "{{ $json.transcript }}" } ] }

David Ebbo

So you're trying to create a new conversation, right? I think it should look more like:

{
  "message": {
    "content": "Conversation created from API",
    "mentions": [
        {
            "configurationId": "claude-3-7-sonnet"
        }
    ],
    "context": {
      "username": "yourname",
      "timezone": "Europe/Paris"
    }
  },
  "blocking": true
}

David Ebbo
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And pass your agent ID in configurationId instead of claude-3-7-sonnet.
Pauline Leroy
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Thank you! It's better I have a result but it is not an answer from the agent : id:xxxx owner id:xx sId:xxx name:xx role:builder segmentation:[null] ssoEnforced:false whiteListedProviders:[null] defaultEmbeddingProvider:[null] metadata isBusiness:false created:xx sId:xx title:[null] visibility:unlisted content:[empty array] requestedGroupIds:[empty array]
David Ebbo
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Pauline Leroy in my initial reply, I had forgotten the "blocking": true, and added it later above. Can you try adding that?
Pauline Leroy
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same results
David Ebbo
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It's a little hard to make sense of what you pasted, because it doesn't have the structure/braces. Normally, the response should have a conversation property, and a message property.
Pauline Leroy
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i think it will be better like this sorry
Loading attachments
David Ebbo
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Ah, yes, clearer! Normally, the interesting part should be in the content array, but yours is empty and I'm not sure why. 🤔

David Ebbo

My best suggestion is to isolate by starting simple. Does it work if you send exactly this in the body?

{
  "message": {
    "content": "What day is today?",
    "mentions": [
        {
            "configurationId": "claude-3-7-sonnet"
        }
    ],
    "context": {
      "username": "yourname",
      "timezone": "Europe/Paris"
    }
  },
  "blocking": true
}

Then if it does, you can add your things one by one: your agent ID, your content.

Pauline Leroy
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is it the right post url : https://dust.tt/api/v1/w/workspaceid/assistant/conversations
David Ebbo
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Yes, it's definitely the right one. https://docs.dust.tt/reference/post_api-v1-w-wid-assistant-conversations
👍1
Pauline Leroy
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No it's the same type of answer without content. Or can it be because we don't have the agent ID yet?
David Ebbo
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No, because in my simple case, you just use claude-3-7-sonnet, so you don't need your own agent ID. Sending this exact body works for me using postman. Maybe you can try postman to isolate, in case n8n is doing something funny?

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