Getting your articles from Instapaper to DEVONthink automatically isn’t straightforward, unfortunately. Power user Annard Brouwer has written a great little script that takes a CSV file exported from Instapaper, converts it using Numbers, and imports the cleaned up result to DEVONthink Pro or Pro Office.
Click here and switch to Install Extras in the Support Assistant or choose Scripts > More Scripts inside the app to install the script. You’ll then find it in Scripts > Import. Annard also provides the script as gist on GitHub.