DOCX is Anthropic’s document Skill for Word files and templates. It separates new-document creation, existing-file editing, and content reading because those tasks require different tools and package handling. Its guidance addresses headings, page geometry, lists, tables, images, and verification of the resulting document. Existing files may also involve tracked changes, comments, and relationships that need to survive an edit. Provide the original file and the exact change request when preservation matters, then render the output and inspect pagination and formatting. The required scripts and office utilities are environment prerequisites. Anthropic makes this Skill source-available under a proprietary license, separate from the repository’s open-source examples.