Plannotator enables developers to visually review AI agent plans and code changes directly in a browser. Users can add inline annotations, ask AI questions about the code, and send structured feedback back to their agent with one click. The tool integrates with popular AI coding assistants including Claude Code, Copilot CLI, Gemini CLI, OpenCode, Pi, Codex, Droid, and Amp, supporting both plan review and git diff code review workflows.