earlier today i actually spent a bit of time asking claude to make an mcp to introspect that - break the session down into summarized topics, so i could try dropping some out or replacing the detailed messages with a summary - the idea being to compact out a small chunk to save on context window, rather than getting it back to empty.

the file is just there though, you can run jq against it to get a list of writes, and get an agent to summarize