dsh-llm-vision-bridge

dsh-llm-vision-bridge

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Let text-only LLMs (DeepSeek) "see" images in the dsh web GUI: paste an image into the chat and the plugin automatically routes it to a vision model (Qwen3-VL via your existing pi-ai / llama.cpp route), then feeds the resulting text description to DeepSeek, which continues the conversation as if it were a native multimodal model.

Features

• Native LLM provider — registers deepseek-vision on the DSH LlmAdapter seam. Image admission, request routing, and session compaction all run through harness-native mechanisms; no UI changes, no front-end interception.
• Zero overhead without images — image-free requests pass straight through to the fallback provider (default deepseek-official).
• Vision-assisted replies — each image block is described by the vision model (attached user text is included in the prompt), then replaced with a [图片 N 描述] text block before the request reaches DeepSeek.
• LRU description cache — the same image + prompt is never re-described; history replay and compaction do not re-run the vision model.
• 503/429 auto-retry — tolerates the desktop GPU's single-card exclusive scheduling (vision gateway returns 503 while other tools occupy VRAM).
• Configurable failure policy — placeholder (insert a failure note and continue) or error (fail the turn).

How it works

The chat composer natively supports image attachments: images enter the model request as {type:"image", attachment} content blocks. The DeepSeek chat-completions adapter rejects image blocks with UNSUPPORTED_CONTENT, so a text-only model cannot process them directly.

This plugin's bridge provider (deepseek-vision) declares inputModalities: ["text", "image"], which satisfies the host's image-admission check (MODEL_DOES_NOT_SUPPORT_IMAGES is otherwise thrown before the message ever reaches the agent). Inside its stream():

1. No image → yield* ctx.llm.stream({ ...options, provider: fallbackProvider }) — passthrough, zero cost.
2. Has image → for each image block, call the vision model via a nested ctx.llm.stream() against the configured vision provider (e.g. pi-ai's llama route; image bytes are read automatically by the attachment service), then replace the image block with a [图片 N 描述]\n<description> text block and forward the rewritten messages to the fallback provider.

Session compaction reuses the provider of the most recent request, so image-bearing history is also bridged automatically. The optional autoRoute setting (default off) additionally rewrites deepseek-official agent requests to this provider, but it cannot bypass the host's image-admission check — it is only a fallback. To actually send images, set the main model to deepseek-vision.

Install

# From GitHub (plain JS, no build step, no allowBuilds needed)
dsh plugin --profile web add github:Einskyle/dsh-llm-vision-bridge

# Or from the npm registry
dsh plugin --profile web add dsh-llm-vision-bridge

# Restart the web service
pnpm dsh web

Manual install without pnpm (equivalent):

1. Copy this package into %USERPROFILE%\.dsh\profiles\web\node_modules\dsh-llm-vision-bridge\
2. Edit %USERPROFILE%\.dsh\profiles\web\package.json:

• add "dsh-llm-vision-bridge": "file:<absolute path>" to dependencies
• add "dsh-llm-vision-bridge" to dsh.profile.bundles

1. Restart the web service

Quick start

1. Open Settings → Models: the new provider 「DeepSeek（视觉桥接）」 appears with models deepseek-v4-flash / deepseek-v4-pro.
2. Set the main model to the bridge provider — agent-default-model.provider: deepseek-vision. This is required: the host's image-admission check reads the session-selected model's inputModalities, and only the bridge model advertises image.
3. Paste/upload an image (PNG/JPEG/WebP/GIF) in the chat composer, optionally with a question, and send. The image is described first (10–40s including cold load), then DeepSeek replies from the description.
4. Switch the main model back to deepseek-official any time for pure text (image uploads are then rejected by admission, as expected).

Configuration (Settings → Models → llm-vision-bridge)

Vision model options

The vision call goes through the pi-ai adapter (ctx.llm.stream against visionProvider/visionModel), so any OpenAI-compatible vision endpoint works — a local llama.cpp gateway is only the default, not a requirement.

Example — add a DashScope route to settings.yaml (or Settings → Models → llm-pi-ai) and point the bridge at it:

llm-pi-ai:
  providers:
    dashscope:
      displayName: DashScope
      apiKeyEnv: DASHSCOPE_API_KEY
      api: openai-completions
      baseURL: https://token-plan.cn-beijing.maas.aliyuncs.com/compatible-mode/v1
      models:
        - id: qwen-vl-max
          name: Qwen-VL-Max
          input: [ text, image ]

llm-vision-bridge:
  visionProvider: dashscope
  visionModel: qwen-vl-max

Settings changes apply without a restart. Constraints: the endpoint must be OpenAI-compatible and accept image input; the vision provider must not be the bridge provider itself (deepseek-vision, recursion guard); cloud routes need a stored credential (apiKeyEnv → Settings → Models), otherwise pi-ai reports MISSING_CREDENTIAL.

Prerequisites

• A vision model route on the pi-ai adapter, configured under Settings → Models → llm-pi-ai (e.g. the llama route: baseURL pointing at the desktop llama.cpp http://<desktop-ip>:18081/v1, model declaring input: [text, image]).
• If the vision provider declares apiKeyEnv but the credential is not set, pi-ai reports MISSING_CREDENTIAL: store any placeholder value on the Settings page (local llama.cpp does not validate the key), or remove that apiKeyEnv.
• Single-GPU exclusive scheduling on the desktop: while other tools occupy VRAM the vision gateway returns 503, which this plugin retries automatically per visionRetries.

Troubleshooting

License

MIT