Artificial intelligence is revolutionizing the education landscape and has been widely applied to language teaching and learning. This study investigates the transformative potential of AI-driven Natural Language Processing (NLP) tools in enhancing writing proficiency, focusing on language precision, content summarization, and creative writing facilitation. Through a meticulously designed experimental setup and a robust theoretical framework that integrates cognitive, sociocultural, human-computer interaction (HCI), and user experience (UX) design theories, the research examines how AI technologies can enhance writing skills, particularly in the context of English as a Foreign Language (EFL) education. By implementing tailored interventions and utilizing a diverse range of AI-powered tools, participants engage in targeted activities to refine various aspects of writing. The study employs a pretest-posttest design with participant random assignment to assess the effectiveness of the interventions. Data analysis includes a combination of descriptive statistics, inferential tests, and qualitative feedback analysis to evaluate writing proficiency enhancements and learners' perceptions. The findings reveal that the group receiving treatment to improve Language Precision through the use of AI-enhanced tools for grammar checking, vocabulary enhancement, and sentence structure refinement demonstrated superior improvements in writing proficiency compared to other groups. Theoretically, this study elucidates how AI-driven NLP tools influence writing proficiency by integrating cognitive, sociocultural, HCI, and UX theories. Pedagogically, it provides insights for instructional practices by illustrating how AI tools can enhance language precision, content summarization, and creative writing, with an emphasis on personalized learning experiences.