One thing that bit me running long agent workflows: hibernate/resume is great until tool results aren't part of the durable snapshot. If the actor wakes from SQLite alone and the previous turn's tool payload lived only in memory (or a temp file), the next step invents a confident continuation. We ended up treating "resume" as unsafe unless the last tool I/O was written into the same durable store as the conversation before suspend. Density numbers matter less than whether wake always reconstitutes enough to refuse to continue when that evidence is missing.