Fault Tolerance / Cost
Kind: tension
Record: tension:cost-fault-tolerance
Canonical: Schema
"fault-tolerance" (correctness-core layer) is traded against "Cost" (structural-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Cost" and choosing an explicit operating point.
Listed in Tensions, after Graceful Degradation / Consistency / Feature Completeness and before Resilience / Complexity.