The Index Checker plugin for Obsidian helps ensure that your index files (MOCs or Canvas files) include all necessary links. The plugin allows you to define how index files are named and which files should be linked within them. It then verifies if any links are missing and provides the option to add them either directly into the index or to a separate file. The plugin offers flexibility, allowing users to organize their index files however they prefer while ensuring completeness. It is particularly useful for maintaining well-linked MOCs and Canvas files, with features such as customizable formatting and marking missing files in the file explorer.