The disclosure duty, and the sentence that limits it. Section 485 of the Higher Education Act, at 20 U.S.C. 1092(h)(1), requires every institution participating in the federal student aid programs to "publicly disclose, in a readable and comprehensible manner, the transfer of credit policies established by the institution," including at a minimum "any established criteria the institution uses regarding the transfer of credit earned at another institution of higher education" and "a list of institutions of higher education with which the institution has established an articulation agreement." Then comes 1092(h)(2)(D), which is the load-bearing fact for anyone relying on a transfer plan. Nothing in the subsection shall be construed to "create any legally enforceable right on the part of a student to require an institution of higher education to accept a transfer of credit from another institution." So the information has to be published, and the decision remains the receiving college's.
That is the mechanism behind the commonest way a two-plus-two plan fails financially. Credits that transfer as free electives rather than toward major or general-education requirements cost nothing at the time and a great deal later, because they add semesters at the more expensive institution. An articulation agreement is the document that forecloses that outcome for the courses it covers, and only for those courses.
The regulation asks for more than the statute does. 34 CFR 668.43(a)(11) requires a description of the college's transfer-of-credit policies including three things. The criteria it uses, "and any types of institutions or sources from which the institution will not accept credits" — a negative disclosure the statute does not require and the more useful half for a student choosing a starting institution. The list of institutions it has articulation agreements with. And "written criteria used to evaluate and award credit for prior learning experience including, but not limited to, service in the armed forces, paid or unpaid employment, or other demonstrated competency or learning." That last item matters to a returning student with military or work experience, and it is routinely overlooked because it sits inside a transfer-credit paragraph.
Where the agreements come from. 20 U.S.C. 1093a(b)(1) directs the Secretary of Education to run a program "for States, in cooperation with public institutions of higher education, to develop, enhance, and implement comprehensive articulation agreements" between institutions in a state and, where practicable, across state lines, and requires that they "be made widely and publicly available on the websites of States and such institutions." The strategies the subsection names are the ones a student will actually encounter as artifacts: common course numbering, a general education core curriculum, and course-equivalency management systems. This is why statewide transfer guides exist in some states and not others, and why a public-to-public transfer inside one state system is usually the most reliable route available.
Two rules of construction, in the same direction. Both sections disclaim federal power over the substance. Section 1092(h)(2)(A) says nothing authorizes the Secretary or the National Advisory Committee on Institutional Quality and Integrity "to require particular policies, procedures, or practices by institutions of higher education with respect to transfer of credit," and 1093a(b)(3) says the same about articulation agreements. Congress built a disclosure regime and deliberately declined to build a mandate, and that is the whole legal shape of the subject.