dsh-web-mermaid

In the DeepSeek Harness web chat, Mermaid fenced blocks in assistant replies used to sit as inert text, forcing you to copy them into another tool to see a diagram. dsh-web-mermaid removes that detour: the instant a streamed message finishes, every Mermaid block is rendered in place as a crisp vector chart, supporting flowcharts, sequence diagrams, class diagrams, gantt charts, and all other Mermaid syntaxes.

The plugin bundles a mermaid.min.js runtime of roughly 3.4 MB; after the initial load the browser caches it, so subsequent renders are instant and offline-friendly. Rendering is deliberately deferred until the full message arrives, preventing half-drawn shapes from flashing on screen. One caveat: DSH user messages are plain text rather than Markdown, so Mermaid blocks only activate in assistant-side messages. External images or links referenced inside a diagram still require network access.

Built for developers, technical writers, and documentation maintainers who sketch architecture, process, or teaching diagrams inside DSH conversations day to day, turning code fences into interactive visuals without a single copy-paste round-trip.