Build Your Own Local AI Coding Agent with Gemma 4 and OpenCode

A local AI coding agent can be built for improved privacy and cost control by using a combination of specific tools. The setup utilizes Ollama to serve a local language model, Google's Gemma 4 as the LLM, and OpenCode as the agent interface. The process involves installing Ollama, pulling the Gemma 4 model, and then installing the OpenCode agent runtime. Finally, a configuration file is created to connect OpenCode to the locally served Gemma 4 model, enabling various coding and workspace tasks to be performed entirely on the user's machine.