As far as I can tell, this team took descriptions of vulnerabilities in the form of CVEs and fed those into a system consisting of various GPT-4 Turbo prompts-with -functions configured for things like executing Playwright commands or running code in a terminal.
They arranged this such that there was a "planner" prompt which could then delegate to prompts specializing in XSS or SQLi. These were the "agents".
I imagine they won't be sharing their code, which is a shame because it would be interesting to see the details of how they got this to work.