This paper explores the design and educational value of a personalized English vocabulary bot using Claude AI for students. It examines how an AI-driven conversational tool can support vocabulary acquisition through contextual explanations, example sentences, collocations, and adaptive practice based on learner level and academic need. Using a theoretical study approach, the paper also situates the proposed bot within the broader development of digital communication and reviews its potential impact on mental health and learner well-being. The discussion highlights both the benefits of AI-supported language learning, such as instant feedback, learner autonomy, and reduced language anxiety, and the concerns associated with digital communication, including overload, distraction, and mental fatigue. The paper concludes that Claude AI can serve as an effective educational companion when used responsibly and pedagogically, offering a balanced model for personalized vocabulary learning in digital contexts.