sfyyy/dsh-vision-bridge

## Core Features
- The plugin gives text-only DeepSeek Harness sessions on-demand vision by registering a vision_describe tool for image questions.
- The text model receives rewritten text markers instead of image blocks, while the session log and UI retain original images.
- Each vision request sends only selected images and a focused question to an OpenAI-compatible vision endpoint, not conversation history.
- The plugin records user uploads and tool-produced screenshots, including images nested in tool results, into an attachment index.
- Configuration can be managed through Settings → Vision Bridge, ~/.dsh/vision-bridge.json, or supported environment variables, with defined precedence.

## Use Cases
- Agents can examine screenshots generated during a DSH session without switching the main conversation to a multimodal model.
- Users can ask questions about uploaded images, diagrams, or charts while the text model remains unchanged.
- Multiple images can be compared in one vision_describe call when the total number of supplied images is between one and four.
- Local image files can be analyzed through absolute paths when the DSH sandbox-aware file service can access them.

## Technical Details
- The package is published as @dsh-extension/dsh-vision-bridge and is installed from npm with the DSH plugin command.
- An agent/pre-step hook builds the attachment index, while a wrapped session.deriveMessages() prevents image blocks from reaching the text model.
- DSH’s built-in llm-pi-ai constructs the OpenAI multimodal request, and the plugin maintains a single vision-bridge provider route.
- The plugin bypasses DSH Web’s image-capability admission check only while enabled, restoring native admission behavior when disabled or uninstalled.

## Notes
- A separate OpenAI-compatible /v1/chat/completions vision endpoint and valid API key are required for image analysis.
- vision_describe accepts one to four images in total, using current-conversation attachment IDs or absolute PNG, JPEG, WEBP, or GIF local paths.
- After adding the plugin to a web profile, dsh web must be restarted so the UI loads the new client bundle.