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POST
/
v1
/
attachments
Upload an attachment
curl --request POST \
  --url https://api.devin.ai/v1/attachments \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'
"<string>"
This endpoint uploads files to our servers and returns a URL that you can reference in Devin sessions. The file isn’t automatically sent to any session - you need to include the URL in your prompts.

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How to Use Uploaded Files

Devin only recognizes attachments when they are written in the exact format ATTACHMENT:"{file_url}" (singular ATTACHMENT, all caps). The ATTACHMENT: line must be on its own line in the prompt, and the URL must be enclosed in double quotes.Simply including the raw URL without this format will not work. Variants like ATTACHMENTS: (plural) are also not recognized.
To reference an uploaded file in a Devin session:
  1. Upload the file using this endpoint to get a URL
  2. Include the URL in your prompt when creating a session or sending a message
  3. Format the URL correctly by putting ATTACHMENT:"{file_url}" on its own line in your prompt

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Complete Example

import os
import requests

DEVIN_API_KEY = os.getenv("DEVIN_API_KEY")

# Step 1: Upload the file
with open("data.csv", "rb") as f:
    response = requests.post(
        "https://api.devin.ai/v1/attachments",
        headers={"Authorization": f"Bearer {DEVIN_API_KEY}"},
        files={"file": f}
    )
file_url = response.text

# Step 2: Create a session that references the uploaded file
session_response = requests.post(
    "https://api.devin.ai/v1/sessions",
    headers={"Authorization": f"Bearer {DEVIN_API_KEY}"},
    json={
        "prompt": f"""Please analyze the data in the attached CSV file and create a summary report.
Focus on identifying trends and key insights.

ATTACHMENT:"{file_url}"
"""
    }
)

print(session_response.json())
Important: The ATTACHMENT: prefix must be on its own line in the prompt with the URL enclosed in double quotes, exactly as shown above: ATTACHMENT:"{url}". To attach multiple files, add one ATTACHMENT:"{file_url}" line per file.

Authorizations

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Authorization
string
header
required

Personal API Key (apk_user_) or Service API Key (apk_)

Body

multipart/form-data
​
file
file
required

Response

Successful Response

The response is of type string.