Mostly the tool surface, not the reasoning. All those tools are what make a general agent good at general work; for me they were clutter, and every extra path was another way to do the same thing slightly wrong.

Least subtle example: two browser providers installed, the wrong one quietly answering and recording nothing — runs looked fine and produced no evidence. No prompt catches that; a narrower tool surface does.

Retrieval barely applies ( for now at least ), since I don't really much do it: a short always-loaded rulebook plus a pass over what earlier runs learned. And no clean before/after number — it's observational and objective :) . What survived narrowing was environmental, like verifying against a build without the fix. That took enforcement and evidence checks, not fewer tools.