{"slug": "show-hn-sommelier-an-excel-addin-for-your-agent", "title": "Show HN: Sommelier, an Excel Addin for your agent", "summary": "A developer released Sommelier, an Excel add-in plus relay server that lets an AI agent work alongside a user inside an Excel spreadsheet, inspired by the marimo pair tool. The add-in is sideloadable but not yet published to the Microsoft marketplace because the developer lacks a Microsoft developer account, and it has been tested with the pi, opencode, and codex harnesses. The developer said the first prototype was written by hand but the code was subsequently rewritten by an LLM, keeping only the core.", "body_md": "Sommelier (there is a nice wordplay on Excel and pairing) is an Excel Addin + relay server that lets your agent work hand in hand with you while you're working on an Excel spreadsheet. It's heavily inspired by the excellent marimo pair.\n\nIt's useful when you either don't want to use Microsoft Copilot, want to use a local model + harness for security reason, or want to use an agent that already has access to personal data.\n\nI've tested it with some harnesses (pi, opencode, codex) but I guess that it should work on many others.\n\nNot having a Microsoft developer account, I've yet to publish it to the marketplace, but it's sideloadable.\n\nWhile the first prototype was written by me, I've only kept the core and let an LLM rewrite the code.\n\nComments URL: [https://news.ycombinator.com/item?id=49790210](https://news.ycombinator.com/item?id=49790210)\n\nPoints: 1\n\n# Comments: 0", "url": "https://wpnews.pro/news/show-hn-sommelier-an-excel-addin-for-your-agent", "canonical_source": "https://sommelier.grokked.it", "published_at": "2026-09-21 17:15:06+00:00", "updated_at": "2026-09-21 17:24:30.537504+00:00", "lang": "en", "topics": ["ai-agents", "ai-tools", "ai-products", "developer-tools"], "entities": ["Sommelier", "Excel", "Microsoft", "marimo", "pi", "opencode", "codex", "Microsoft Copilot"], "alternates": {"html": "https://wpnews.pro/news/show-hn-sommelier-an-excel-addin-for-your-agent", "markdown": "https://wpnews.pro/news/show-hn-sommelier-an-excel-addin-for-your-agent.md", "text": "https://wpnews.pro/news/show-hn-sommelier-an-excel-addin-for-your-agent.txt", "jsonld": "https://wpnews.pro/news/show-hn-sommelier-an-excel-addin-for-your-agent.jsonld"}}