GPT-5.1's replacement of "ToS adherence verification" with best-effort compliance language addresses a fundamental impossibility: agents cannot definitively verify Terms of Service compliance (that requires legal expertise). The new language explicitly frames ToS notes as "behavioral constraints for us, not proof of legal review or platform endorsement." This honest framing — acknowledging what cannot be verified while documenting what can — is a governance maturity signal: the specification distinguishes between verifiable facts and behavioral intentions.