modlens: A Vision Plugin for DeepSeek Harness, Giving Text-Only Models Sight

What Does It Do?

ModLens is a DSH plugin for DeepSeek Harness that gives text-only models vision capabilities. It solves the problem that DeepSeek, GLM, and other text-only models cannot read images, letting you paste an image directly into the chat and get structured JSON evidence (OCR, layout, semantics). Core capabilities include auto-discovering and wrapping eligible text-only model routes, zero-config startup, multi-key rotation, and cross-platform reuse.

Core Features

• Paste-to-read: paste an image directly into the chat without saving to a file first, automatically converting it to structured JSON evidence.
• Auto-discovery of model routes: automatically detects and wraps eligible text-only DeepSeek, GLM, or MiMo Pro models, while native vision models (like GLM-5.3-Flash) are excluded automatically.
• Zero-config startup: reuses existing setups in Claude Code, Codex, OpenCode, Pi, and also supports the Antigravity CLI free channel or a Gemini key.
• Multi-key rotation: comma-separated API keys rotate on auth, rate-limit, or quota failures; other failures skip remaining keys and keep existing provider failover.
• Evidence, not imagination: provides full transcription, reading-order layout regions, entity and relation lists, so the model quotes specifics.
• Install once, use everywhere: verified on real machines in Claude Code, Codex, Pi, and OpenCode.

How to Use This Plugin?

After enabling it in DSH, there are two paste methods: first, just paste the image, which lands as a private temp file and enters the composer, then the modlens_read_image tool takes it from there; second, pick a (modlens vision) entry in the model selector (it remembers your choice, so once is enough), then paste, and the thumbnail stays visible in your message, converted to structured evidence at request time. A stock install gets DeepSeek-V4-Flash (modlens vision) and DeepSeek-V4-Pro (modlens vision) entries, while extra routes like opencode-go or zai get their own.