Both patients and providers experience barriers to discussing complementary medicine during oncology consultations. This study describes the development of two communication tools—a question prompt sheet and a visual slideshow—and aims to evaluate their acceptability, perceived usefulness, and intention to use among patients with cancer. Nine (former) patients with breast cancer were involved in the development of the tools as co-researchers. The 15-item evaluation questionnaire was completed by 144 participants recruited from three Dutch hospitals, a patient panel, and the Dutch Breast Cancer Society. The tools’ content and layout were generally acceptable, although suggestions were made to include items on exercise and diet in the question prompt sheet. About half of the participants found the tools useful, while the other half felt they were unnecessary, either because they could already discuss complementary medicine with their healthcare provider or had no interest in the topic. The tools were considered particularly helpful for fellow patients. The tools were well received though minor modifications were suggested. The lack of perceived need by half of the participants may have influenced the results. For effective use of the tools, it is important to identify patients who need extra support in discussing complementary medicine.