Offline AI Agent Development

I want to develop and build an AI agent that runs locally on my laptop without an internet connection. It should analyze data, solve specific problems I provide, and present findings and suggested solutions clearly. I need help designing and building the system, including software architecture, suitable local AI models, data-processing tools, user interface, and privacy and security safeguards. The agent should work entirely offline, allow me to provide files or describe a problem, and explain the reasoning behind its results.