Markagent is a Chrome extension designed to streamline the process of providing UI feedback for AI coding agents. With its user-friendly interface, users can annotate web elements with just a click, capturing precise details such as the React component, CSS selectors, and context. This functionality makes it suitable for a range of users including designers, product managers, and frontend engineers, facilitating clear communication of UI changes and bugs.

The tool allows for full-page or element-specific screenshots and can record user journeys as numbered playthroughs, enhancing the clarity of feedback given to development teams. Markagent exports structured prompts that can be seamlessly integrated into various AI coding agents like Claude Code, Cursor, and Codex. Notably, it operates entirely within the browser, ensuring user privacy and data security, and is available for free without the need for accounts or additional setup.