you could for example create a skill to access your database for testing purposes and pass in your tables specifications so that the agent can easily retrieve data for you on the fly.
it’s also for (typically) longer context you don’t always want the agent to have in its context. if you always want it in context, use rules (memories)
but if it’s something more involved or less frequently used (perhaps some debugging methodology, or designing new data schemas) skills are probably a good fit
