The person taking over should hear the known risks before discovering them alone.

Handovers cover the procedure and skip the folklore: the client who calls at six, the step that fails in cold weather, the file nobody trusts. Whoever is leaving stopped seeing those as facts long ago, since they became instinct. The next person learns them the expensive way, alone, usually at the worst moment.

Before you pass something on, write down the three things you know that are written nowhere. Say which ones have already caused trouble, and who to call when they do.