Is MCP only for Adobe Commerce or does Open Source work too?

Both. The MCP server pattern in this guide is platform-edition-agnostic, it talks to Magento via the GraphQL endpoint, REST API, and (optionally) direct DB reads via PyGento. All three surfaces exist on Magento 2.4.x Open Source. Where Adobe Commerce wins: B2B Companies, content staging, shared catalogs, and segment-aware product recommendations, tools you can wrap as MCP tools if you have the licence. Where Open Source matches: catalogue, orders, customers, stock, search, sales reports, CMS pages, and webhooks, everything most stores actually need from an AI agent. Gate the Adobe-only tools at server startup based on installed modules and ship a single codebase that works on both editions.