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Overview

Klaviyo is a B2C marketing platform: profiles and the events they generate drive email and SMS campaigns, automated flows, lists and segments. The remote MCP server signs in with OAuth and is open to Owner, Admin and Manager roles; add `read-only=true` to its URL to turn off every tool that writes. The `klaviyo` CLI has a command for every JSON API operation and takes a private API key (`pk_...`). The API takes that key as `Authorization: Klaviyo-API-Key <key>` plus a `revision` header with the API version date, such as `2026-07-15`; the CLI sends both for you.