Fan-In Ceiling

Kind: constraint

Layer: Execution Core

Record: architecture:fan-in-ceiling

Severity: contextual

Scope: allocation, surface

Canonical: Ontology

A rule or precondition that the useful number of parties is bounded by the fan-in of the most contended surface, where claims resting on it go stale faster than they help.

Listed in Architecture principles, after Derived Party Count and before State-Arity Limit.

Requires

• Fan-In

Reinforces

• Derived Party Count

Enables

• Traceable Guarantee

Violated by

• Crowded Surface

Refactored by

• Mark Claims with Their Read Moment
• Partition the Surface

Severity

• contextual

Category

• Coordination Surfaces

Linked from

• Scale follows from structure
• Coordination Surfaces
• Coordination Surfaces
• Severity levels

in this codebase

• models/coupling.model.md