dsh-md-picker

The official attachment pipeline in DeepSeek Harness handles images only, yet the files people actually want to hand the agent are Word specs, PowerPoint minutes, PDF tables, and loose text notes. Pasting their content inline blows past the context window and destroys structure such as heading hierarchy, merged table cells, and nested lists. dsh-md-picker adds a single "Doc + Markdown" button beside the input box that routes three file families to the right place: images go through the native attachment rail; plain text is read as raw bytes with encoding auto-detected (BOM, UTF-8, UTF-16, GB18030, and more) and stored as UTF-8; and convertible documents (full Office suite, PDF, RTF, EPUB, ODF, CSV) are POSTed to a local server where anydoc transcodes them into high-fidelity Markdown that preserves headings, tables with merged cells, and lists. Each file contributes only a short receipt to the message path, character count, and a 120-character preview the body never enters session context, and the agent loads it on demand with standard file tools.

The plugin ships a thorough set of guardrails. A SHA-256 content fingerprint deduplicates uploads so identical files land on disk exactly once. A server-side semaphore caps concurrent anydoc processes at two, queues the rest, and returns 429 when the queue overflows. Single-file size is limited to 25 MB, file names are sanitized against path traversal, and atomic unique naming appends -1/-2 suffixes to prevent same-millisecond collisions. Creating the attachments directory auto-writes a .gitignore so it never pollutes the git working tree. Per-IP, per-route rate limits are enforced, and optional token authentication hardens LAN access. On the interaction side, files can be dropped anywhere in the input area, uploads show a live percentage, the button spins during conversion (aria-busy), bounces a green check on success or flashes a red cross on failure, and multiple files are tracked by a pending counter that resolves only when all are settled. prefers-reduced-motion disables the spin animation, and results are announced through aria-live.

If your day in DeepSeek Harness involves handing documents product specs, meeting minutes, data tables, annotated scans to the agent without letting wall-to-wall text devour the context budget, dsh-md-picker makes sharing a doc with the agent as effortless as dropping an image.