Mailchimp MCP Server

Name: Mailchimp MCP Server
Author: cyanheads

by cyanheadsversion 0.6.0i★ –iRuns on your computer

Registry nameio.github.cyanheads/mailchimp-mcp-server

Install

Overview

Description from the maker (original English)

Mailchimp via MCP: draft, test, and send campaigns; manage audiences and subscribers; pull reports.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio, Streamable HTTP
Category: Marketing & social media
You need to fill in: MAILCHIMP_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: MAILCHIMP_API_KEY, MAILCHIMP_BASE_URL, MAILCHIMP_TIMEOUT_MS, MAILCHIMP_MAX_RETRIES, MAILCHIMP_CONCURRENCY_LIMIT, MAILCHIMP_ASSETS_DIR, MAILCHIMP_TEMPLATES_DIR, MCP_LOG_LEVEL

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "mailchimp": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "your-value",
        "MAILCHIMP_BASE_URL": "your-value",
        "MAILCHIMP_TIMEOUT_MS": "your-value",
        "MAILCHIMP_MAX_RETRIES": "your-value",
        "MAILCHIMP_CONCURRENCY_LIMIT": "your-value",
        "MAILCHIMP_ASSETS_DIR": "your-value",
        "MAILCHIMP_TEMPLATES_DIR": "your-value",
        "MCP_LOG_LEVEL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add mailchimp --env MAILCHIMP_API_KEY=your-value --env MAILCHIMP_BASE_URL=your-value --env MAILCHIMP_TIMEOUT_MS=your-value --env MAILCHIMP_MAX_RETRIES=your-value --env MAILCHIMP_CONCURRENCY_LIMIT=your-value --env MAILCHIMP_ASSETS_DIR=your-value --env MAILCHIMP_TEMPLATES_DIR=your-value --env MCP_LOG_LEVEL=your-value -- npx -y @cyanheads/mailchimp-mcp-server

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "mailchimp": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "your-value",
        "MAILCHIMP_BASE_URL": "your-value",
        "MAILCHIMP_TIMEOUT_MS": "your-value",
        "MAILCHIMP_MAX_RETRIES": "your-value",
        "MAILCHIMP_CONCURRENCY_LIMIT": "your-value",
        "MAILCHIMP_ASSETS_DIR": "your-value",
        "MAILCHIMP_TEMPLATES_DIR": "your-value",
        "MCP_LOG_LEVEL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "mailchimp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "your-value",
        "MAILCHIMP_BASE_URL": "your-value",
        "MAILCHIMP_TIMEOUT_MS": "your-value",
        "MAILCHIMP_MAX_RETRIES": "your-value",
        "MAILCHIMP_CONCURRENCY_LIMIT": "your-value",
        "MAILCHIMP_ASSETS_DIR": "your-value",
        "MAILCHIMP_TEMPLATES_DIR": "your-value",
        "MCP_LOG_LEVEL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

MAILCHIMP_API_KEY required env
Mailchimp Marketing API key, including the '-dc' data-center suffix (e.g. 'abc...-us22'). Generate at Mailchimp → Account → Extras → API keys.
MAILCHIMP_BASE_URL env
Override the API base URL (for mock servers or testing). Defaults to 'https://{dc}.api.mailchimp.com/3.0' derived from the API key suffix.
MAILCHIMP_TIMEOUT_MS env
Per-request timeout in milliseconds.
MAILCHIMP_MAX_RETRIES env
Max retry attempts for transient upstream failures (0-10).
MAILCHIMP_CONCURRENCY_LIMIT env
Max in-flight upstream requests across this process (1-10).
MAILCHIMP_ASSETS_DIR env
Absolute path to a local assets directory. When set (Node-only — Workers ignored), enables the `mailchimp_assets` tool and auto-uploads `@assets/ ` references in campaign HTML to Mailchimp File Manag…
MAILCHIMP_TEMPLATES_DIR env
Absolute path to a local templates directory. When set (Node-only), enables the `mailchimp_local_templates` tool and support for `content.localTemplate` on campaign tools. Templates are `.eta` files…
MCP_LOG_LEVEL env
Minimum log level for output: debug, info, notice, warning, or error.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account cyanheads, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Marketing & social mediai

More stars than 0% of the other 3567 servers in this category
Published to the registry more recently than 82% of the other 3567 servers in this category
Basic checks equal to or better than 100% of the other 3567 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Mailchimp MCP Server safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: MAILCHIMP_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.6.0) reached the registry 6 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@cyanheads/mailchimp-mcp-server Draft, test, and send Mailchimp campaigns straight from your MCP client — with audience management, subscriber CRUD, and post-send analytics behind safe-by-default send gates. STDIO or Streamable HTTP. 18 Tools (+2 conditional) • 4 Resources • 1 Prompt

Overview

Mailchimp campaign management. Draft, test, and send email campaigns, manage audiences and subscribers, and review post-send analytics, with optional local image and template directories for authoring.

Tools

Tool	Description
`mailchimp_account`	Account profile, plan, data center, and the Chimp Chatter activity feed
`mailchimp_audiences`	Read, create, and update audiences (lists), with per-audience analytics and signup-form config
`mailchimp_audience_overview`	One-call audience digest: info, stats, growth history, top email clients, merge-field schema
`mailchimp_subscribers`	Subscriber reads, updates, archive, tags, notes, and engagement history
`mailchimp_upsert_subscriber`	Add or update one subscriber idempotently, with status, merge fields, tags, and a note
`mailchimp_find_subscriber`	Locate a subscriber by email in one audience or across the account
`mailchimp_import_subscribers`	Batch add or update up to 500 subscribers per call, `pending` by default
`mailchimp_segments`	Segment CRUD (saved, static, fuzzy), member listing, and batch add/remove
`mailchimp_merge_fields`	Read, create, and update custom subscriber attributes
`mailchimp_campaigns`	Campaign records, content, send checklist, and RSS/resend controls
`mailchimp_send_campaign`	Compose a campaign and leave it as a draft, test it, send it, or schedule it in one call
`mailchimp_replicate_campaign`	Duplicate a campaign with overrides, then draft, test, send, or schedule
`mailchimp_reports`	Campaign reports: the index, one report, or one of ten report dimensions
`mailchimp_campaign_report`	Post-send digest: headline metrics plus top links, locations, and unsubscribes
`mailchimp_templates`	Mailchimp-hosted templates; reads work on free plans, writes need a paid plan
`mailchimp_files`	File Manager uploads, listing, renames, and deletes on Mailchimp's CDN
`mailchimp_search`	Search members or campaigns across the account
`mailchimp_assets` (conditional: `MAILCHIMP_ASSETS_DIR`)	Inspect and pre-warm uploads for `@assets/` references in campaign HTML
`mailchimp_local_templates` (conditional: `MAILCHIMP_TEMPLATES_DIR`)	Author and render local `.eta` templates, the template write path on free plans
`mailchimp_playbook`	Procedural playbooks merged with live account state; advice only

Resources

Resource	Description
`mailchimp://account`	Account snapshot: profile, plan, data center, total subscribers
`mailchimp://audiences/{audienceId}`	Audience snapshot: name, contact, stats, double opt-in status
`mailchimp://campaigns/{campaignId}`	Campaign snapshot: status, settings, recipients
`mailchimp://campaigns/{campaignId}/report`	Post-send headline metrics for a campaign

All resource data is also reachable through tools; audiences and campaigns are listed with each tool's list operation.

The server also publishes an agent skill, mailchimp-guide (skill://mailchimp-guide/SKILL.md, source in skills/mailchimp-guide/): the send, campaign-lookup, click-tracing, and subscriber gates, plus where each ID comes from.

Prompts

Prompt	Description
`newsletter_from_source`	Compose an editorial newsletter from a URL or brief, then walk it through draft, test, and send

Design reference: docs/email-design-playbook.md.

Capability reference

`mailchimp_account` tool

operation: info returns profile, plan, data center, total subscribers, and industry benchmarks; operation: activity-feed returns Chimp Chatter events, paged by count (max 100, default 20) and offset
An empty activity feed carries a note naming the likely causes

`mailchimp_audiences` tool

Operations: list, get, create, update, the analytics reads list-activity, list-growth, list-clients, list-abuse-reports, list-locations, and get-signup-forms / customize-signup-forms (takes signupFormConfig); every operation except list and create needs audienceId
create requires name, contact (company, address1, city, state, zip, country), permissionReminder, and campaignDefaults (fromName, fromEmail; language defaults to en)
update with a partial contact or campaignDefaults keeps the omitted subfields' current values (one read before the write)

`mailchimp_audience_overview` tool

audienceId plus growthMonths (1–36, default 12); returns info, stats, contact, campaign defaults, growth history, top email clients, and the merge-field schema
notes[] explains empty growth or email-client arrays, separating "no data yet" from zero engagement

`mailchimp_subscribers` tool

audienceId on every call and email on every operation except list, which narrows by status only and rejects email (look one address up with get or mailchimp_find_subscriber); operations: list, get, update, archive, list-tags, set-tags, list-notes / add-note / update-note / delete-note (by noteId), and list-activity / list-events / list-goals
Addresses are trimmed and rejected if the local or domain part is missing; an empty list email stays unfiltered. update to subscribed asks for confirmation when resuming a subscription; already-subscribed members are left as they are
set-tags is declarative: tags becomes the full active set and every other tag is removed unless named in preserveTags (static-segment membership is stored as a tag). Returns tagsAdded, tagsRemoved, and tagsActive

`mailchimp_upsert_subscriber` tool

audienceId, email, and status required; optional mergeFields, tags + preserveTags (same declarative sync as set-tags), note, vip, language; updateExistingStatus: false applies status to new records only
Returns isNew, the resulting status, tagsAdded / tagsRemoved / tagsFinal, noteAttached, and webUrl
status: "pending" uses Mailchimp's double opt-in flow. New or resumed subscribed status asks for confirmation of documented consent before anything is written; declining writes nothing. Already-subscribed updates and updateExistingStatus: false keep the existing status without asking

`mailchimp_find_subscriber` tool

email accepts an address or free-form search fragment, including a fragment without @, scoped to one audienceId or, when omitted, every audience on the account (echoed as searchedAcross)
Returns exactMatches and fuzzyMatches with merge fields and stats; includeTags (default true) adds each match's tags at one extra call per match

`mailchimp_import_subscribers` tool

audienceId and 1–500 subscribers rows per call; status defaults to pending (double opt-in) and a per-row status overrides it; updateExisting defaults to false, so existing records are skipped
Any row that would be subscribed needs one confirmation before the whole batch writes; declining writes nothing. Pending-only imports need none
Returns totalCreated, totalUpdated, errorCount, and per-row succeeded and failed entries; incomplete addresses fail as invalid_email, and a batch with no valid rows makes no upstream request

`mailchimp_segments` tool

audienceId on every call and segmentId on every operation except list (filterable by type: saved, static, fuzzy) and create; create / update take name, staticEmails, or saved-segment options
batch-update-members applies membersToAdd / membersToRemove to a static segment and returns added, removed, and per-email errors
Free plans get static and basic saved segments; advanced conditions need Premium and fail as mailchimp_forbidden

`mailchimp_merge_fields` tool

list, get, create, update; create requires name, tag (10 characters max), and type; get / update take mergeId
options carries type-specific config: choices for dropdown / radio, date_format for date / birthday, phone_format for phone

`mailchimp_campaigns` tool

Operations: list (filter by status, listId, sinceSendTime / beforeSendTime), get, create (type of regular / plaintext / rss, plus recipients and settings), update, replicate, get-content, set-content, get-checklist, cancel-send, create-resend, pause-rss, resume-rss; all but list and create take campaignId
set-content accepts html, plainText, templateId + templateSections, archiveContent, url, or localTemplate (exclusive with html and templateId); get-checklist returns isReady and typed items
get-content accepts variant: html | plainText | archiveHtml | all (default all); empty bodies are omitted and formatted output carries complete selected bodies as fenced JSON
No send, test, schedule, or delete here; dispatch goes through mailchimp_send_campaign or mailchimp_replicate_campaign

`mailchimp_send_campaign` tool

audienceId, subject, fromName, replyTo, and content (at least one of html, plainText, templateId, localTemplate) required; mode is draft (default), test (needs testEmails, max 50), send, or schedule (needs `scheduleT

Only the beginning is shown; read the rest in the repo

Mailchimp MCP Server

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Marketing & social mediai

Common questions

Alternatives

MCP YouTube Transcript

Google Analytics MCP

BibiGPT YouTube Video Summarizer

README from the maker

Overview

Tools

Resources

Prompts

Capability reference

mailchimp_account tool

mailchimp_audiences tool

mailchimp_audience_overview tool

mailchimp_subscribers tool

mailchimp_upsert_subscriber tool

mailchimp_find_subscriber tool

mailchimp_import_subscribers tool

mailchimp_segments tool

mailchimp_merge_fields tool

mailchimp_campaigns tool

mailchimp_send_campaign tool

`mailchimp_account` tool

`mailchimp_audiences` tool

`mailchimp_audience_overview` tool

`mailchimp_subscribers` tool

`mailchimp_upsert_subscriber` tool

`mailchimp_find_subscriber` tool

`mailchimp_import_subscribers` tool

`mailchimp_segments` tool

`mailchimp_merge_fields` tool

`mailchimp_campaigns` tool

`mailchimp_send_campaign` tool