Show HN: Sommelier, an Excel Addin for your agent

Category: devtools

Tags: excel, ai-agent, mcp, add-in, encrypted-relay, typescript

Score: 7.0/10 (Innovation: 7, Technical: 8, Documentation: 7, Utility: 6)

Sommelier is an Excel add-in that connects your workbook to a personal AI coding agent (like Codex, OpenCode, or Claude Code) via an encrypted WebSocket relay, enabling chat-based inspection and modification of spreadsheets without granting Microsoft Copilot access. It provides a secure, self-hostable bridge between Excel and local agent harnesses, with bounded range operations, approval workflows, and offline Excel documentation.

Target audience: Excel power users, data analysts, and developers seeking to integrate AI agents into spreadsheet workflows without cloud data exposure.

Repository: https://sommelier.grokked.it · TypeScript · NOASSERTION

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