iceriverlin/dsh-session-upload

Attach files to a DeepSeek Harness (DSH) conversation and make them readable by any agent out of the box.

• 📎 button in the composer tool row → multi-file picker.
• Uploaded files are stored under an uploads root with sanitized, timestamped names — and an auto-extracted UTF-8 .txt sidecar is written next to each file whose content can be extracted (plain text copied through; docx / xlsx / pptx / zip / odt extracted with a built-in zero-dependency reader). No agent-side parsing libraries needed for those formats.
• Each upload inserts an inline capsule at the end of the draft (native conversation reference). Sending serializes to a compact 📎 <file name> text — full paths never enter the chat.
• Capsules clear with the draft after sending.

Tested on DeepSeek Harness Web 0.1.1-rc.2 (host webServer exact route + conversation.input.* slots + draft-reference pipeline). Newer dsh trains may need a compatibility pass.

Install

dsh plugin --profile web add @iceriverlin/dsh-session-upload
dsh web

Local development (this repo):

dsh plugin --profile web add file:C:/path/to/upload-plugin
dsh web

Configure the uploads root (important)

The agent must be able to read the stored files, so pin the root to a directory inside your DSH workspace. Patch the profile (profiles/web/cordis.patch.yml):

- id: session-upload
  name: '@iceriverlin/dsh-session-upload'
  inject: [webServer]
  config:
    root: 'C:/your/workspace/uploads'   # ← absolute, agent-readable

Defaults when not configured: maxBytes = 50 MB, path = /api/dsh-upload/v1/put, root = <dsh web cwd>/uploads — always set root explicitly (the web server's cwd may not be your workspace).

Agent protocol

See AGENTS.md: a user message with 📎 <name> means the file is stored under the uploads root as timestamp[-<SSS>]-<name> (match by suffix); prefer the .txt sidecar when present.

Format matrix

Upload	.txt sidecar	Notes
txt/md/json/csv/log/code	✅	content copied
docx/xlsx/pptx/zip/odt	✅	zip-family extraction, no deps
legacy .xls	❌	binary OLE — needs extra tooling (SheetJS)
pdf	❌	no built-in PDF sidecar; read side: pdf-parse / vision
images/binaries	❌	original preserved (images: use your vision options)

Remove

dsh plugin --profile web remove @iceriverlin/dsh-session-upload
dsh web

Uploaded files under the uploads root are not removed by uninstall.

Security notes

• Files stay local; nothing is forwarded anywhere.
• Filenames are sanitized (path separators, control chars, leading/trailing dots, Windows reserved device names) with the extension preserved when a long name is truncated, and namespaced with a yyyyMMdd-HHmmss[-SSS] timestamp; no path traversal through the name, no same-second overwrite.
• Archive text extraction is guarded against zip bombs (entry count and per-member size caps) and honors UTF-8 / UTF-16 BOMs.
• The route binds to the same webServer as the GUI (loopback by default), answers only POST with a non-empty body under the size cap.
• Third-party code runs with host permissions: review before use. MIT licensed.