I promise this isn't meant to be snarky, but is that not just...logs?
Which are unavailable with the leading American models. You can't look at the complete traces of OpenAI or Anthropic model agents, as they are encrypted (there's been discussion of a couple of different ways to expose those, but that violates terms of service, and well, you shouldn't have to find complicated ways unencrypt your own usage logs).
It's logs of activity the US models hide from you in fear of them being used by competitors.
It's useful logs which i think is an important distinction.
Logs that aren't missing anything out of the box. I'd say it's pretty underused concept in time of 8TB consumer SSD drives.
It's only logging if an obsolete human does it.
But the future is here and thus it's called "Agentic causality's reified temporal traceability."