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Klaviyo K:BOS 2026: Headless Opens 490 APIs to Claude and ChatGPT

At K:BOS 2026 on September 9-10 in Boston, Klaviyo launched Headless: more than 260 MCP tools and more than 490 APIs callable from Claude, ChatGPT or any AI system. Agents can read Klaviyo data, write to it, and put a campaign live without anyone opening the interface. SQL inside the Klaviyo Data Platform shipped as a preview. Here is what changes for a brand already running Klaviyo, and how to scope permissions before you connect anything.