PPTX is Anthropic’s document Skill for creating and modifying presentation files and templates. It distinguishes a new deck from edits to an existing package, and includes tools for extracting text, inspecting slide thumbnails, managing slide content, and validating the saved file. This helps an agent work with the structure of a presentation while checking how its individual slides actually render. Provide the audience, message, source material, and any template that must be preserved. Output review should include both the narrative across slides and issues such as overflow, alignment, image placement, and missing content. The Skill is source-available under Anthropic’s proprietary document-Skill license.