ModLens is a vision plugin designed to provide multimodal capabilities to text-only large language models, such as DeepSeek's flagship series and GLM-5.3. The tool operates by intercepting pasted images and routing them through a dedicated vision engine to generate structured evidence, including full transcriptions, layout regions, and entity relations. Users can install the plugin via command line using npx -y @deepseek-ai/dsh plugin --profile web add @liustack/modlens@3.26.5 or through an automated installation script. ModLens utilizes a sophisticated failover chain involving ten different vision sources, including six built-in providers like Gemini API, OpenAI-compatible endpoints, and Anthropic, as well as four local agent CLIs (Codex, OpenCode, Pi, and Grok) that allow for the reuse of existing authenticated sessions. The plugin supports high-performance workflows, with Gemini API reads typically taking 5-10 seconds. It is engineered for minimal system impact, requiring no local proxies or daemon processes, and is compatible with various environments including Claude Code and DeepSeek Harness. For advanced configuration, users can rotate comma-separated API keys to manage rate limits and quotas or pin specific providers to ensure consistent performance.