Show HN: LHIC – Deterministic browser automation without an LLM in the fast path

A new open-source tool called LHIC (Local Human Intent Controller) introduces a dual-route architecture for deterministic browser automation, using a fast path that runs locally in under 35ms without LLM calls for standard web flows, and a slow path that falls back to an LLM only for complex tasks. The tool features self-healing semantic locators, enterprise-grade security, and MCP integration, aiming to address the speed, cost, and brittleness issues of existing LLM-based browser agents.

We built LHIC Local Human Intent Controller because we were frustrated by existing LLM-based browser agents. Tools like WebVoyager or ServiceNow's baseline agents are amazing, but they are: 1. Slow: Taking 20 to 40 seconds per simple form-fill step. 2. Expensive: Calling GPT or Claude for every single click. 3. Brittle: Failing the second a minor DOM class name shifts. LHIC introduces a "Fast Path / Slow Path" dual-route execution architecture: - Fast Path Local, 0 LLM call : For standard web flows logins, forms, search , LHIC matches user intents directly with pre-defined skills and resolved DOM attributes locally. It runs in under 35ms median with zero API call costs. - Slow Path LLM, Fallback : Only activates for complex, open-ended tasks or when a high-risk action is flagged. Key Technical Highlights: Self-Healing Semantic Locators: We fuzzy-match DOM structural targets using SQLite historical skill memory, achieving an 80% success rate improvement over static CSS/XPath selectors when layouts change. Enterprise Hardening: Features KMS Ed25519 signature checks AWS/GCP/Vault , local AES-256-GCM database encryption, OTel APM export, and a custom Docker Seccomp profile to prevent Chrome escape. VNC Screencast: Streams real-time page updates directly via CDP frame broadcasts for manual override. MCP Integration: Standard Model Context Protocol stdio and HTTP gateway, ready to plug into Claude Desktop, Windsurf, or Cursor. It's entirely open-source MIT and written in pure TypeScript with zero C++ compilation dependencies. We'd love to hear your thoughts on the architecture and hybrid execution concept Repo: https://github.com/chengmatt416/LHIC https://github.com/chengmatt416/LHIC Documentation: https://lhic-docs.pages.dev https://lhic-docs.pages.dev Comments URL: https://news.ycombinator.com/item?id=48932029 https://news.ycombinator.com/item?id=48932029 Points: 1 Comments: 0