Invoke Agent Payload

💬 Workflows
,
1

Hello all

I have found a couple of posts of the json payload needed in a workflow in order to invoke an agent but this payload only includes text content and I also need to send a file in base64 format. I have seen something like this in another post

{
"messages": [
{
"role": "user",
"content": [ { type: "text", text: {{ code1.data.message }} },
{ type: "document", filename: {{ workflow1.data.name }}, file_data: {{ code1.data.attach }} }]
}
],
"action": "invoke"
}

but I get an error that the content should be a string and not an array.

Any help would be appreciated.

3

Hey @hrisafis

Thank you for reaching out to the Retool community.

You should be able to send these information to a Workflow, no problem. What I think might be happening here is your JSON is not formatted completely. All JSON keys need to be in double quotes — type, text, filename, and file_data were missing them.

I went ahead and remade it for you to try and copy and paste and see if this fixes it.

{
"messages": [
{
"role": "user",
"content": [
{ "type": "text", "text": {{ code1.data.message }} },
{ "type": "document", "filename": {{ workflow1.data.name }}, "file_data": {{ code1.data.attach}} } ]
}
],
"action": "invoke"
}

I would recommend checking your JSON in the IDE of Retool as it should mention if its in Object format in the send to the Workflow Resource.

Screenshot 2026-02-12 at 3.13.43 PM
Screenshot 2026-02-12 at 3.13.43 PM846×364 27 KB

You could also use an online JSON checker to make sure its all correct too.

Let me know if this helps resolve it or you are facing a different issue.

Regards,
John | Retool Support

4

Thank you for your reply. I actually got the solution from another community member MiguelOrtiz, the issue was that I had to stringify the content property.

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