So, I'm going to talk about them now. Now, let's start with compaction. A log can grow indefinitely, but a model's view of it can't. Context windows are finite. So, eventually, you do need to compact the log into a smaller representation that the model can reason about. But the important point is that this compaction is not magic and it doesn't break the claim that the log is the agent. Compaction is lossy. A compacted summary is not going to perfectly reproduce the state of the agent in a smaller form. It's actually going to throw information away. The point is the full log is the record and a compaction is just one projection of it. Just like how a materialized view is not the database or a summary of a conversation is not the conversation. If you keep the raw log, you can always generate new projections from it. But if you throw away the raw log and keep only the compaction, you've effectively lost part of the agent. So, it's cleanest to treat compaction as a best effort lossy fork, one that you can resume as a new log. The second objection is what about tools that change state outside of the log? And that's true. An agent can edit a file. It can create a GitHub issue. It can send an email. So, clearly, there is state outside of the log. But, the point is is that the log is not supposed to contain the whole world. The log is just the agent's view of the world. It's just like how in the video game in in Skyrim, the Skyrim save file doesn't contain the entire game engine or every asset in the map. It just contains the player specific state, which is needed to drop you back into that world. And the same is true for the log and agents. The log can only faithfully resume or store that agent's identity and its view of the world, but it cannot make that world deterministic. If the agent sent an email, forking back won't unsend it. If some file got changed underneath, the agent won't know about it. But, the log's job is to record what the agent did, what it saw, what changed, and what it needs to continue. It stores that identity, and that's its purpose. And much like that Skyrim character save file, it's not meant to store the entire world. It's just meant to store its view of it. So, once you start treating the log as a