# Lean Interface Iteration

Rule set name: `lean-interface-iteration`

Rule set ID: `LII`

Status: optional, prompt-activated only

Trigger examples:

- `Apply the lean-interface-iteration rules.`
- `Apply LII rules.`

LII-0001: Apply this rule set only when it is explicitly requested in the prompt.

LII-0002: The target of work under this rule set is the iterated product state for the addressed iteration only.

LII-0003: Optimize the addressed interface toward the leanest and least complex model that still satisfies the iteration order.

LII-0004: Backward compatibility, legacy aliases, and compatibility shims are not required unless the prompt explicitly asks to preserve them.

LII-0005: Prefer one authoritative interface over multiple overlapping parameters, flags, or naming variants.

LII-0006: Remove or avoid transitional interface layers when they are not required by the addressed iteration order.

LII-0007: Update affected tests, guidance, requirements, and documentation so they describe the simplified interface model rather than a mixed legacy-and-new model.

LII-0008: Never change behavior, interfaces, or surrounding areas that are not addressed by the current iteration order.