Overview

If you’re coding against the Marketing API with an AI agent, two kinds of tools are worth knowing about: some let your agent read this documentation directly, and one teaches it to use the API the way an experienced Mailchimp developer would.

Read the docs

• MCP server connects your agent to this site over the Model Context Protocol, so it can search these docs from your editor or terminal instead of you pasting passages into the conversation.
• llms.txt is a machine-readable index of every page, in markdown. Point an agent at it to fetch docs directly, without parsing HTML.

Searching and fetching solve different problems: use the MCP server when your agent doesn’t know where to look, and llms.txt when it already knows which page it needs.

Call the API correctly

Agent skills package Mailchimp’s API quirks, like tags being managed through segments and contacts addressed by an MD5 hash of a lowercased email address, into instructions your agent loads automatically for the relevant task. Install them once and every coding agent that supports the format uses them from then on.