One Leg Can Raise an Objection. It Can't Settle One.

Originally published on hexisteme notes . I run a small fleet of AI agents that check each other's work — one agent drafts a conclusion, another (usually from a different model vendor) is asked to poke holes in it. For a while I had two house rules governing that setup, and I followed both of them literally, and they turned out to say opposite things. Rule one, in my notes on verification schemas: a single dissenting reviewer's opinion cannot be used to settle whether a conclusion is right. You need more than one independent voice before you act on an objection. Rule two, in my notes on picking verification tools, and echoed in my own global defaults: in ordinary (non-load-bearing) situations, one cross-vendor review pass is enough. Don't multiply reviewers past that. Read together, those two rules can't both survive contact with a real decision. If a single reviewer flags a problem, do I need a second reviewer before I'm allowed to change anything (rule one), or was the first pass already sufficient (rule two)? Every time I actually had a single dissenting opinion in hand, I had to pick which rule to obey, and I had no principled way to choose. Either verification bloats to two-plus passes every single time, quietly violating the "one pass is enough" default, or I quietly ignore the first rule and act on one voice anyway. Both outcomes are silent failures of the same kind: a rule sitting in the document that isn't actually being followed. The bug wasn't in either number My first instinct was to argue about the numbers — is one enough, or do you need two? That's the wrong axis. When I actually traced where the two rules came from, they were answering different questions that I had been treating as one question. "Can I collect a dissenting opinion from a single source?" and "can I act on that dissenting opinion?" are not the same operation, and there's no reason they should require the same quorum. Collecting an objection is cheap and low-stakes. One reviewer, one pa