OVI-CODE is a C++20 terminal application that connects to OpenRouter, OpenAI, Anthropic, or xAI/Grok. It can inspect a workspace, read and edit files, and show every model response, tool call, result, and diff in a full-screen interface. Built-in techniques are just the starting point. Native C++ plugins let you customize how the agent approaches a task, runs model/tool passes, and verifies its work without rebuilding OVI-CODE.