Knowledge Sense Inc. (Headquarters: Minato-ku, Tokyo; CEO: Atsushi Kadowaki; hereinafter referred to as Knowledge Sense) is pleased to announce that the "Custom Instructions" feature, which allows users to specify response policies and preconditions for each Notebook, has been released today, June 30, 2026, for the Notebook function of our secure generative AI agent for corporations, "ChatSense". Secure "Notebook AI" Service for Corporations Implements Custom Instructions Feature ChatSense offers a corporate "Notebook AI" service that allows users to add documents as sources and ask questions, summarize, or create slides based on their content. Following the recent beta release, we have continued to expand our features and have now implemented the "Custom Instructions" function, enabling users to specify response policies and preconditions for each Notebook. For more details, please contact us. https://chatsense.jp/contact ■ Background of the Release Generative AI, including ChatGPT, is being adopted by many corporations to improve operational efficiency and service quality. Knowledge Sense's "ChatSense" has also gained attention for its strengths in security and its ability to perform additional learning with internal data, leading to its adoption by over 500 companies, including major corporations listed on the Tokyo Stock Exchange Prime Market. Since the beta version of ChatSense's Notebook function was released on June 22, 2026, as an AI service for corporations that can generate content based on documents, it has been used by many user companies. However, we have received numerous requests from users in the field, such as "It's troublesome to rewrite the preconditions for every question when the preconditions and response policies differ for each Notebook," "I want to differentiate between a sales document Notebook that should answer in plain language and a technical specification Notebook that should answer with precise technical terms," and "I want to change