Here's how to add the Codex Security plugin in Codex and get started:
Add the plugin in Codex. After installation is complete, the button changes to “Try in chat.”
Click “Try in chat” to start a new Codex chat with a Codex Security scan prompt ready to run.
Choose a folder that contains the code you want Codex Security to review.
Send the scan prompt. Codex opens with the Codex Security scan prompt ready. Press “Send” to start the scan.