DeepSeek Harness Plugin: dsh-viewer

dsh-viewer is a core plugin for DeepSeek Harness, designed to address the lack of file display capabilities. Through the `display_file` tool, it renders 36 formats—including images, videos, PDFs, Office documents, and local webpages—directly inline in both the Web UI and desktop client, providing actual media players rather than merely displaying file names. The plugin supports web sandboxing and document caching, and relies on LibreOffice to process certain document types. Installation must be performed by adding it via the CLI or desktop interface, and it incorporates security mechanisms such as HMAC path validation, Content-Security-Policy, and LRU caching policies. It is compatible with Harness 0.2.0 and above.