The modern school library is a complex social setting "grounded in standards and best practice" (AASL 2018). The new "National School Library Standards" have refreshed the student learning standards and aligned new Shared Foundations to the school library. Additionally, the competencies for learners are now complemented by competencies of effective school librarians. To be effective, school librarians must be aware of classroom pedagogy and possess a thoughtful disposition about their practice. Professional competence challenges school librarians to continuously monitor and self-assess while being receptive to professional growth. Ideally, school librarians are self-reflective. This reflective stance toward practice allows librarians to model the self-reflection process for learners and impact practice for greater student improvement. This articles presents how school librarians reimagine, reflect, and react with the new standards.