FLUID-WP-0005 T07. Primary metrics, guardrails, secondary observations
and learning signals stay in separate roles, and there is no universal
scalar: the standards decline to define one, and inventing one would
make the interface's most important trade-offs on the operator's behalf.
Three verdict rules carry the weight. A guardrail breach dominates
primary success, because a candidate that hit its target while
regressing a guardrail traded something it was told not to. Apparent
success on too few samples is inconclusive rather than successful, since
promoting on three requests is promoting on noise. A metric missing from
one side is reported absent rather than defaulted to zero, which would
read as a dramatic change that never happened.
Specs are an input, never derived from the data, so that changing
success criteria after seeing results requires a recorded amendment
rather than being indistinguishable from normal operation.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014KmVxhJ35tCo7rE7UnLwWu
Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 1116572@bnt-lap001
Assistant-Session: 8ba9bb93-a72a-4883-b189-2499cce5c400
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