“In my previous role, searching for a library or service’s owner involved looking at Google Sheets or maybe asking around in Slack channels that referred me to other Slack channels. It took me sometimes one or more hours just to find an answer to a simple question about another team’s code.”

This assumes that there is an “owner” of the code, but code usually changes constantly with documentation drifting out of date as soon as the code is changed significantly. Seems like a product manager might have some of this information as part of a functional specification for the last major effort, but even this will be out of date quickly.

This whole problem is organizational in origin. A high level living document should be maintained, especially for APIs that are exposed to third parties. Lack of that document is the fault of management. Not sure how another tool solves that problem.