This work specifies a fully reproducible audit protocol for detecting structural drift in discursive systems under recurrence. The protocol instantiates the structural sensitivity operator relation in the discursive domain by operationalizing recurrence as a countable repetition unit (meeting, negotiation round, hearing, review cycle) and structure as an explicit admissibility grammar (evidence admissibility and precedence, refutation criteria, thresholds, authority, scope, closure, and term locks). The audit yields exactly three outcomes per recurrence window: fixed admissibility structure under recurrence, admissibility structure drift under recurrence, or structural indeterminacy when structure cannot be specified reproducibly. The paper includes standard artifacts (admissibility structure card and drift ledger), a two-auditor reproducibility protocol, local falsifiability conditions, and minimal structural intervention operators designed to stabilize the next recurrence window. The method is designed as a cross-domain standard for negotiation, diplomacy, science, law, and governance, without making truth-ascriptive claims. --- Intellectual Property & Licensing The KOGNETIK Research Series is released under the Creative Commons Attribution–NonCommercial 4.0 International License (CC BY-NC 4.0). All scientific works within the series may be cited, shared, and adapted for non-commercial research purposes with proper attribution. Commercial use—including consulting, advisory services, integration into commercial platforms, monetized training, certification, or system-level deployment—is not permitted under this license and requires a separate written agreement. Full license text:https://creativecommons.org/licenses/by-nc/4.0/ For licensing, partnerships, translations, or applied development inquiries:research@kognetik.dehttps://www.kognetik.de ORCID: https://orcid.org/0009-0000-8544-4847 Kognetik Series Information KOGNETIK — Minimal Operator Definition of Reflexivity (Ψ = ∂S/∂R) Reflexivity as structural rate-of-change:Ψ = ∂S/∂R measures structural drift under recurrence. Process, not state:Reflexivity specifies a transformation rule rather than a content or level. Domain-independent operator:Applicable across biological, cognitive, artificial, social, industrial, and geophysical systems. Non-ascriptive and empirically testable:Ψ enables comparative analysis of systems via observable structure and recurrence. Higher-order phenomena as specifications:Learning, adaptation, consciousness, governance, and identity are structured regimes of Ψ.