Literature search is one of the most foundational steps in medical research. Before protocol design, evidence synthesis, peer review, or manuscript writing, researchers must first identify the right body of evidence. A weak literature search process creates downstream problems: missing key studies, incomplete evidence mapping, duplicated screening effort, and poor reproducibility in review workflows. This becomes even more critical in biomedical research, where studies are distributed across multiple databases such as PubMed, CrossRef, OpenAlex, Semantic Scholar, and specialized repositories. The Multi-Database Literature Collector 's core task is simple but essential: Build a cross-database candidate literature pool for a biomedical topic, clinical question, translational problem, method query, or research-planning need. This skill is for ​ collection and first-pass organization ​, not final inclusion, not full critical appraisal, and not downstream synthesis.…