Fiddling with “Agent” and wile checking a preference had a small window asking after permission to connect with omni.sync for omni focus, psw is rejected ( shaking “no” phenomenon ), checked with omni and it is a happy camper psw wise ( it works )? Common, rare problem. I do not know what “Agent” actually does in relation to omni Focus, I realize it might use it for local search but not that I understand that very well.
Actually DEVONagent does neither use nor support any Omni services or products. Do you use any custom plug-ins or did you open a website related to Omni in a browser window? A screenshot of the small window would be useful, thank you.
Regarding your questions as to open websites and customs plugins, I had web pages open but not to omni unless the omnifocus has something running in the background? I am not aware of any custom plugins for agent ( factory default to my knowledge ). Everything is nominally current OS on MacBook Pro ( circa 2017 ), D-agent is current, as in D-Think-3 and OmniFocus is current.
After rebooting the phenomena appears to have stopped. What it wanted with my keychain psw so for access is maybe a legacy issue perhaps? Anyway so far it has not repeated thanks for your time and interest.