Cyber Guardians Shield System (CGSS) v2.0 introduces the Mission Accountability Gate, a constitution-layer governance boundary for agentic AI systems operating near sensitive resources, protected infrastructure, and legacy systems. As large language models evolve into agentic systems capable of planning, tool use, code generation, iterative probing, delegation, and multi-stage interaction with external environments, access verification alone may no longer be sufficient. A technically authenticated agent may still operate under an ambiguous, outdated, overextended, inherited, or insufficiently accountable mission. CGSS v2.0 therefore asks a prior governance question: What are you here to do, and who is accountable? The proposed Mission Accountability Gate requires an agent or orchestration system to make externally legible the mission purpose, instruction origin, accountable human or institutional authority, requested resource, intended operations, authorized scope, validity conditions, stopping conditions, and human-review pathway. A Mission Declaration is not treated as authorization. It is treated as a set of claims requiring internal coherence assessment, external verification where appropriate, and continuing comparison with observed behavior. The resulting principle of Declaration–Behavior Coherence enables divergence between declared mission and runtime action to be treated as an integrity signal. CGSS v2.0 connects mission accountability with the existing CGSS Constitution Layer, runtime enforcement, human review, and external protection for legacy systems. It addresses both malicious behavior and non-malicious mission drift, including stale authority, incomplete delegation, ambiguous instructions, unauthorized replanning, and continued execution after a stopping condition. This record contains two complete editions: • English edition — White Paper v1.0, Abstracted Public Edition• Japanese edition — White Paper v1.0, Abstracted Public Edition Implementation-sensitive information—including exact challenge wording, schemas, verification-source selection, identity-binding mechanisms, scoring models, thresholds, behavioral comparison logic, route-selection rules, quarantine triggers, and runtime enforcement sequences—is intentionally excluded. Publication does not constitute authorization. The disclosure of this defensive architecture does not grant permission to test, probe, bypass, reproduce, or deploy against any system without explicit lawful authorization. Author: Kazuko SonobeAffiliation: Cyber Guardians Collective Research (CGC.Research)Collaborating LLM: Meridian (GPT-5.6 Thinking)Version: White Paper v1.0 — Abstracted Public EditionLanguages: English and Japanese Related previous publication: Cyber Guardians Shield System (CGSS) v1.0 — Abstracted Public Editionhttps://zenodo.org/records/20122477
Kazuko Sonobe (Mon,) studied this question.