analyze-image-tool

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A vision bridge for text-only DeepSeek Harness models: registers an analyze_image tool that answers questions about images via any OpenAI-compatible vision/multimodal endpoint. No vendor is hard-coded — bring your own baseURL + apiKey + model.

用户: 看下 ~/Desktop/error.png 是什么报错
模型 → analyze_image(path="~/Desktop/error.png", prompt="这个报错的完整文本是什么？")
     ← "TypeError: Cannot read properties of undefined (reading 'map') at …"
模型: 这是一个 … 建议 …

Features

• Generic endpoint: One config (baseURL + apiKey + model) covers any OpenAI-compatible endpoint — SiliconFlow, DashScope compatible-mode, Zhipu, OpenRouter, Volcano, local Ollama, OpenAI… zero vendor logic in code.
• Sandbox-safe reading: Local images优先走宿主沙箱 fs 通道（ctx.fs.readBytes），遵守会话路径策略；没有该通道的宿主自动回退到 Node 原生读取。也支持 http(s) URL 和 data: URL。
• Schema safety: Tool parameters compiled via defineTool to standard JSON Schema with object root（type: "object"）, avoiding the pitfall of "tool schema root is not object causing whole session 400 crash"（dsh community #297）。
• Robustness: API key auto-scrubbed in error messages; </think> reasoning blocks auto-stripped from thinking models; </think>-only responses treated as "reasoning without answer" with actionable prompts.
• Structured return: { text, model, usage } with endpoint model id and token counts.
• Coexistence: Tool name analyze_image doesn't conflict with community's view_image / see_image / vision_glance; works alongside patch bridges like dsh-image-bridge.
• WebUI settings panel: Small eye icon in web session header corner — edit all settings (baseURL / apiKey / model / call params / prompt template), save/switch multiple configs, built-in connectivity test.

Install

Requires: DeepSeek Harness (dsh) 0.1.x, Node.js ≥ 18.17.

# Install from main branch (includes runtime bridge for pasted images; switch to matching tag after release)
dsh plugin --profile web add github:CaseyTso/dsh-analyze-image-tool#main
dsh --profile web

Note: The v0.1.0 tag is an early version supporting only local path/URL image reading, without the paste-image bridge.

package.json declares dsh.bundle.patch — installed as profile layer automatically, no manual cordis.patch.yml editing needed.

Configuration

Prefer the WebUI panel (recommended), or configure in profile's cordis.patch.yml under the plugin id:

- id: analyze-image-tool
  config:
    baseURL: https://api.siliconflow.cn/v1     # Any OpenAI-compatible endpoint
    apiKey: ***                                  # Leave empty to use below chain
    model: Qwen/Qwen3-VL-32B-Instruct           # Vision/multimodal model id on the endpoint
    maxTokens: 2048
    timeoutMs: 60000                            # Increase for large images / slow endpoints, e.g. 120000
    maxImageBytes: 10485760
    defaultQuestion: Describe this image thoroughly. Include any visible text verbatim, the overall layout, and notable details.
    composerNoteTemplate: 用户在这条消息里粘贴了一张图片（附件 ID: {attachment_id}）。要查看图片内容，请调用 analyze_image 并传入该附件 ID（attachment_id 参数）。

composerNoteTemplate supports {attachment_id} and {image_index} placeholders.

Endpoint Examples (same config, pick one)

Use case	baseURL	Model example	Notes
SiliconFlow (default)	https://api.siliconflow.cn/v1	Qwen/Qwen3-VL-32B-Instruct	Requires key, strong vision
Alibaba DashScope	https://dashscope.aliyuncs.com/compatible-mode/v1	qwen3-vl-flash	Compatible mode, cost-effective
Zhipu	https://open.bigmodel.cn/api/paas/v4	glm-4.6v-flash	Free tier available
OpenRouter	https://openrouter.ai/api/v1	google/gemini-2.5-flash	Multi-model aggregator
Local Ollama	http://localhost:11434/v1	qwen3-vl:4b	No key needed, fully offline

API Key Resolution Chain (in order)

1. apiKey saved in WebUI panel（ctx.settings user layer）
2. Plugin config apiKey（cordis.patch.yml）
3. Environment variable VISION_API_KEY, then SILICONFLOW_API_KEY（can be in ~/.dsh/.env or exported）
4. dsh credential channel（VISION_API_KEY, then SILICONFLOW_API_KEY）
5. Local endpoint (localhost) requires no key

Leaving apiKey empty in the panel = no override, continues down the chain.

WebUI Settings Panel

Two entry points:

• Session header eye icon (analyze-image-tool) at top-right of web session header.
• System settings tab: web settings modal → Plugins (插件) → 识图插件 — the same panel embedded as a settings tab.

Click to:

• Edit baseURL / apiKey / model / maxTokens / timeoutMs / maxImageBytes
• Edit defaultQuestion（default query when model calls analyze_image without prompt）
• Edit composerNoteTemplate（paste-image-to-text rewrite template, supports {attachment_id} and {image_index}）
• Save multiple config presets: name current config, switch via dropdown; default from cordis.patch.yml
• Click "Test connectivity": sends a real chat/completions request with a 64x64 test image to verify endpoint and model availability
• Changes take effect immediately, no restart needed

Panel读写走插件自带的 HTTP API（/api/analyze-image-tool/settings、/api/analyze-image-tool/test），并持久化到 dsh 的 ctx.settings 用户设置中。

Tool Usage

Model calls analyze_image for image-related tasks:

• path（mutually exclusive with attachment_id）: absolute local path, http(s) URL, or data: URL（支持 PNG/JPEG/WebP/GIF/BMP/TIFF/HEIC，默认上限 10MB）。
• attachment_id（mutually exclusive with path）: attachment ID of image pasted into composer（形如 sha256:…）, see "Paste image recognition" below.
• prompt（optional）: specific question, e.g. "extract all visible text verbatim", "count buttons", "describe layout". Default is detailed description including all visible text.

Paste Image Recognition (composer images)

Text-only models (e.g., deepseek-v4-flash) cannot receive images natively: DSH rejects "image + text-only model" at the apiproxy prompt inbound gate（MODEL_DOES_NOT_SUPPORT_IMAGES）。This interception point precedes all plugin hooks.

This plugin now includes a runtime bridge — paste images work out of the box（无需再打宿主补丁）:

1. API gateway wrapping: When loaded in web profile, plugin wraps apiProxy.sessions.prompt. On sending messages with images, it first fetches the current session model via session.models, then checks image support via ctx.llm.resolveModelInfo.
2. Image block rewrite for text-only models: If the current model doesn't support images, plugin persists each image using the host's same attachment strategy（validateImage → saveImage）, then rewrites image blocks to user-visible text "用户粘贴了一张图片（附件 ID: sha256:…），要查看请调用 analyze_image(attachment_id=…)", and indexes the full attachment reference in memory. Vision models pass through untouched, receiving images natively.
3. Model invocation: Model sees the prompt and calls analyze_image(attachment_id="sha256:…"); plugin reads bytes via ctx.attachments.readImage and forwards to the vision endpoint.

Backward compatible with old host patches: If host has already applied apiproxy/prompt-content seam patch, plugin retains seam listening logic; since runtime bridge runs before seam, both paths won't double-rewrite — host patch becomes fallback path（旧方案见 docs/adr/0001，运行时桥接决策见 docs/adr/0002）。

Limitation: Attachment reference index is in-process; after server restart, attachment IDs in historical sessions can't be read back（需重新粘贴）; paste → send → recognize within the same session works fine.

Development

npm test        # node --test, no external dependencies (fetch is mocked)

Security

• Each call makes one HTTPS request to your configured endpoint; image content sent as base64 — don't send sensitive images you're unwilling to hand to that provider.
• Plugin writes no files, collects no data, manages no credentials; API keys always scrubbed as *** in error messages.

License

MIT, authors are analyze-image-tool contributors.