In this paper, we propose a toolkit, wear-UCAM, which can support mobile user interactions in smart environments through utilizing user's context. With the rapid developments of ubiquitous computing and its relevant technologies, the interest in context-aware applications for mobile/wearable computing also becomes popular in both academic and industrial, fields. In such smart environments, furthermore, it is crucial for a user to manage personal information (health, preferences, activities, etc) for the personalized services without his or her explicit inputs. Regarding reflection of user's context to context-aware applications, however, there are only a few research activities on such frameworks or toolkits for mobile/wearable computers. In the proposed wear-UCAM, therefore, we focus on a software framework for context-aware applications by taking account of how to acquire contextual information relevant to a user from sensors, how to integrate and manage it, and how to control its disclosure in smart environments.