Interruption Over Reconstruction

Reconstruction tells you what happened. Interruption decides what happens next. The loop is the only place the second option is available, which is why detection belongs inside it.

The archaeology problem

Post-incident analysis is genuinely excellent in this industry. Teams reconstruct attack chains with forensic precision, produce timelines, extract indicators, harden the specific path. And the same class of incident happens again, because reconstruction operates on a clock that no longer matches the threat.

An agent completes its task in seconds. The best forensic timeline in the world describes an action that finished before the first alert fired. The timeline has value, but its value is historical. The money is gone, the deletion is done, and the postmortem is a very well-documented account of a done thing.

What interruption requires

Three capabilities, all engineering. Detection inside the loop, which means instrumenting the doorway, not the aftermath. A decision path fast enough to act within the loop's own clock, which means thresholds ranked in advance and authority granted in advance. And an interrupt mechanism the agent cannot talk its way past, which means the kill switch lives outside the agent's own permission set.

None of the three is a research problem. All three are budget and will.

The false positive cost

Interruption has a cost that reconstruction does not: false positives stop legitimate work. This is the objection that kills in-loop detection in most organizations, and it is a real cost with real tuning curves.

The resolution is ranking, not tolerance. Irreversible, high-blast-radius actions earn aggressive thresholds and accept the false positive cost, because the alternative to a false stop is an unrecoverable harm. Reversible, low-radius actions earn loose thresholds, where interruption is rarely worth it. The ranking is the engineering. The rest is plumbing.