Thin Common Cartridge (TCC), an extension of the Common Cartridge standard by 1EdTech, is a lightweight specification focused on enabling interoperability between Learning Management Systems (LMS) and external learning tools by embedding references to content rather than the content itself. Built on the IMS Content Packaging framework, TCC provides a manifest file to define a minimal structure that includes metadata and web links (typically via HTTPS) to resources hosted elsewhere, such as quizzes, activities, or multimedia, without requiring the full packaging of assets into a ZIP file. It integrates seamlessly with the Learning Tools Interoperability (LTI) standard, allowing single sign-on and contextual launches of external tools while passing basic user and course data. This streamlined approach reduces file size, simplifies content updates, and enhances flexibility, making TCC a key standard for connecting distributed educational resources and tools efficiently in modern digital learning ecosystems.