INV-ARC-006: Command Boundary for Mutation

Reference Number	Version	Effective Date	Supersedes	Authority Level
INV-ARC-006	1.1	2026-10-14	1.0	Constitutional

I. Purpose

Define the mutation boundary for all runtime behavior.

II. Scope

Applies to all state mutation.

III. Authority Level

Constitutional within INV-ARC. Derived from INV-CORE-000 Section III.3, Deterministic and Traceable Financial Logic, and governed within the hierarchy described by INV-CORE-001.

IV. Dependencies

• docs/INVARIANT/CORE/INV-CORE-000_CORE_INVARIANTS.md
• docs/INVARIANT/CORE/INV-CORE-001_CAPABILITY_BASED_ARCHITECTURE_AND_AUTHORITY_MODEL.md
• INV-ARC-003_SCOPED_CAPABILITY_EVALUATION.md

V. Core Rule

All state mutation MUST occur inside explicit domain commands.

Mutation during:

• capability evaluation
• query execution
• request rendering

is forbidden.

VI. Rebuild Intent

This rule exists to eliminate hidden writes in reads, feature-layer mutation shortcuts, and cross-domain side effects disguised as helper behavior.

VII. Downstream Consequence

DOM must own explicit mutation commands, and FEAT must never mutate state outside those commands.

VIII. Amendment

Revisions must preserve explicit command-only mutation.