Add a message to a session

Adds a user message and optionally waits for agent completion. Supports text, images, and file attachments. This feature is enabled for selected organizations only.

POST /api/v0/sessions/{sessionId}/messages

Add a message to a session

cURL

curl --request POST \
  --url https://api.factory.ai/api/v0/sessions/{sessionId}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "text": "<string>",
  "images": [
    {
      "type": "base64",
      "data": "<string>",
      "mediaType": "image/jpeg"
    }
  ],
  "files": [
    {
      "type": "base64",
      "mediaType": "application/pdf",
      "data": "<string>",
      "parsedData": "<string>",
      "name": "<string>",
      "path": "<string>"
    }
  ],
  "computerId": "<string>"
}
'

200

{
  "messageId": "<string>",
  "status": "idle"
}

Authorizations

Authorization · string · header · required

Factory API key or JWT token for authentication

Path Parameters

sessionId · string · required

Body

application/json

text · string · required

Message text content

images · object[]

Optional base64-encoded images

Show child attributes

files · object[]

Optional file attachments (PDFs, text files)

Option 1

Option 2

Show child attributes

computerId · string

Computer ID to route the message to; falls back to the session.computerId if omitted

Response

200

application/json

Response for status 200

messageId · string · required

ID of the created user message

status · enum<string> · required

Agent status after message submission

Available options: idle, pending, running