The Shadow Wolves Improvement Act seeks to enhance the effectiveness of the Shadow Wolves Program by directing the Director of U.S. Immigration and Customs Enforcement (ICE) to clearly define its mission and goals in coordination with partnering Tribal governments, including the Tohono O'odham Nation. This includes determining the necessary number of special agents and their required knowledge, skills, and abilities for national staffing. Within 180 days, the Director must update the program's strategy to include measurable objectives for recruitment, retention, and expansion, along with a timeline and milestones for achieving these goals. The bill also requires ICE to provide current GS-1801 Tactical Officers, known as Shadow Wolves, with detailed information regarding the implications of reclassifying as special agents, covering pay, retirement, and training requirements. Furthermore, the Act mandates the development of a succession plan to ensure timely recruitment of qualified individuals to fill anticipated special agent vacancies. It also requires the Director to establish criteria for expanding the program to additional tribal lands, considering funding and proximity to federal law enforcement training facilities. Finally, the bill allows for the noncompetitive conversion of Shadow Wolves with three years of experience from excepted service to career appointments in the competitive service, and requires a report to Congress on the implementation of these enhancements.