dsh-tool-vision

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A DeepSeek Harness plugin: the model-facing image_describe（识图） tool. It reads a local image file and asks the DashScope OpenAI-compatible API (qwen3.7-flash) to describe it or answer a focused question.

Works in every agent preset: the bundle patch inserts the tool at the host plane, so every session sees it in the tool catalog.

Install

dsh plugin --profile web add dsh-tool-vision

Restart dsh web (or install it from the Plugin Market with one click). The tool appears as image_describe in the model's tool catalog.

Paste bridge

On the web surface, pasting or dropping an image into the composer while the session's model is text-only (positively confirmed from provider metadata) uploads each draft image to the plugin's host route, releases the draft, and appends [image: <path>] text to the prompt before sending — so the request never trips the host's image admission, and the model can read the file with image_describe. Vision-capable or unknown models keep the native intake (the image attaches inline, unchanged).

The uploaded copies live in the harness data home ($DSH_HOME/media, default ~/.dsh/media) under the same naming convention as the harness's own image-to-path conversion.

The sent message also renders the images back inside its user row in the transcript: a conversation node matches the [image: <path>] markers in the user message and displays the copies served by the host route while hiding those transport markers from the visual bubble. The stored path text remains unchanged for the text-only model.

API key

The plugin ships no key. Set the key in the environment that starts DSH:

DASHSCOPE_API_KEY=sk-xxxx

You can also pass it per-row in cordis.patch.yml:

- id: tool-vision
  name: 'dsh-tool-vision'
  config:
    apiKey: sk-xxxx

Without a key the tool registers normally and fails with VISION_NO_API_KEY on use, naming the fix.

Tool

Tool	Args	Behavior
image_describe	path (string), prompt (string, optional)	Resolves the image (absolute path, or relative to the workspace), sends it as a base64 data URL plus the prompt to POST {baseUrl}/chat/completions, and returns the assistant text. Omitting prompt uses defaultPrompt (a complete content description).

Config

Key	Default	Meaning
baseUrl	https://dashscope.aliyuncs.com/compatible-mode/v1	DashScope OpenAI-compatible endpoint.
apiKey	DASHSCOPE_API_KEY environment variable	DashScope API key; an explicit config value wins over the environment.
model	qwen3.7-flash	Vision model id.
defaultPrompt	请详细描述这张图片的内容：画面主体、关键细节、文字信息（如有）、布局与结构。	Instruction used when a call omits prompt.
timeoutMs	120000	Cooperative tool-call timeout budget (ms).
maxImageBytes	20971520	Cap on one image's byte size.
maxOutputChars	65536	Cap on the returned description text.

Security

• No credentials ship with the package; the key stays in your environment or profile config.
• The HTTP client sets redirect: 'error': the configured endpoint receives the credential, and a redirect fails the call instead of forwarding the key or the image to another origin.
• The image bytes go only to the configured endpoint.

Known Limitations and Deferred Work

• Single provider, single request shape — the tool targets the DashScope OpenAI-compatible endpoint only; a provider-selection seam is deferred until a second vision backend needs the same schema.
• No vision-specific permission policy — the tool executes without requesting ctx.approval; a deployment that needs confirmation must add a tools/pre-execute policy.

License

MIT