GitHub Pull Request Hook
Updated: the 26th of August 2021 26th of 2021
Previously there was no such hook that could satisfy this answer, however 7 years have passed, and things have changed. The contemporary GitHub platform does offer a hook for listening to whether or not a Pull Request has been altered (aka "Edited").
A very thorough, and well developed,
Pull Request Hook
, or (PR Hook), now exists. As with all of the associated "GitHub WebHooks" , the PR-Hook uses aWebhook payload object
that is unique from all otherGitHub WebHooks
. The PR-Hook has special actions that can trigger code in response to a wide variety of events, however; for specifically to the altercation of a Pull Request's description, theedited
action is what you will likely want to use.