Guidance Clarity Act of 2019 This bill requires federal agencies to state on the first page of guidance documents that (1) such guidance does not have the force and effect of law, and (2) noncompliance by regulated parties with suggested behavior in such guidance does not conclusively establish a violation of applicable law. Excluded from this requirement is guidance directed to the issuing agency or other agency that is not intended to have a substantial effect on the behavior of regulated parties, as well as internal executive branch legal advice or opinions addressed to executive branch officials.