Connect
Optimize
Secure
Mailchimp MCP Server
for AI Agents
Production-ready Mailchimp MCP server with 80 extensible actions — plus built-in authentication, security, and optimized execution.
Mailchimp MCP Server
Built by 
StackOne
StackOne 
Coverage
80 Agent Actions
Create, read, update, and delete across Mailchimp — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Mailchimp MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Mailchimp tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Mailchimp call.
Tools Discovery →What is the Mailchimp MCP Server?
A Mailchimp MCP server lets AI agents read and write Mailchimp data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Mailchimp MCP server ships with 80 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, and optimized agent context. Connect it from MCP clients like Claude Desktop, Cursor, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Mailchimp MCP Tools and Actions
Every action from Mailchimp's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Campaigns
- Create Campaign
Create a new email campaign with specified type and settings
- Send Campaign
Send a campaign immediately or schedule it for later delivery
- List Campaigns
Retrieve a paginated list of email campaigns with filtering and sorting options
- Get Campaign
Retrieve detailed information for a specific campaign by ID
- Search Campaigns
Search all campaigns for the specified query terms
- Update Campaign
Update settings for an existing campaign (only editable campaigns can be modified)
- Delete Campaign
Permanently delete a campaign (cannot be undone)
Audiences
- Create Audience
Create a new audience (list) with required contact and permission settings
- List Audiences
Retrieve all audiences (lists) in the account with pagination support
- Get Audience
Retrieve detailed information for a specific audience by ID
- Update Audience
Update settings for an existing audience
- Delete Audience
Permanently delete an audience and all associated member data
Audience Members
- Add Audience Member
Add a new member to an audience with subscription status and merge fields
- List Audience Members
Retrieve all members of a specific audience with pagination and filtering
- Update Audience Member
Update an existing audience member's information and subscription status
- Delete Audience Member
Permanently delete a member from an audience
Email Templates
- Create Email Template
Create a new email template with HTML content and optional folder assignment
- List Email Templates
Retrieve all email templates in the account with pagination support
- Get Email Template
Retrieve detailed information for a specific template by ID including HTML content
- Update Email Template
Update an existing template's name, HTML content, or folder assignment
- Delete Email Template
Permanently delete a template
Template Folders
- Create Template Folder
Create a new folder for organizing templates
- List Template Folders
Retrieve all template folders for organizing templates
Automations
- Create Automation
Create a new classic automation workflow in your Mailchimp account
- List Automations
Retrieve all classic automations with pagination and filtering support
- Get Automation
Retrieve detailed information for a specific automation workflow by ID
Automation Emails
- List Automation Emails
Retrieve all emails in a specific automation workflow
- Get Automation Email
Retrieve detailed information for a specific email in an automation workflow
Automation Subscribers
- Add Automation Subscriber
Manually add a subscriber to an automation workflow
- List Automation Subscribers
Retrieve subscribers currently in a specific automation workflow queue
- Remove Automation Subscriber
Remove a subscriber from an automation workflow
Requests
- List Batch Requests
Get a summary of batch requests that have been made
- Delete Batch Request
Stop a batch request from running (results of completed operations will not be available)
Webhooks
- Create Batch Webhook
Configure a webhook that fires whenever any batch request completes processing (maximum 20 webhooks)
- List Batch Webhooks
Get all webhooks that have been configured for batches
- Get Batch Webhook
Get information about a specific batch webhook
- Update Batch Webhook
Update a webhook that fires whenever any batch request completes processing
- Delete Batch Webhook
Remove a batch webhook (webhooks will no longer be sent to the given URL)
Landing Pages
- Create Landing Page
Create an unpublished and contentless Mailchimp landing page (may require specific plan or permissions)
- Publish Landing Page
Publish a landing page that is in draft, unpublished, or has been previously published and edited
- List Landing Pages
Get all landing pages with pagination support
- Get Landing Page
Get information about a specific landing page
- Update Landing Page
Update a landing page
- Delete Landing Page
Delete a landing page
Segments
- Create Segment
Create a new segment in a specific list
- List Segments
Get information about all available segments for a specific list
- Get Segment
Get information about a specific segment
- Update Segment
Update a specific segment in a list
- Delete Segment
Delete a specific segment in a list
Segment Members
- Add Segment Member
Add a member to a static segment
- List Segment Members
Get information about members in a saved segment
- Batch Segment Members
Batch add or remove list members to or from a static segment
- Remove Segment Member
Remove a member from the specified static segment
Member Tags
- List Member Tags
Get the tags on a list member
- Update Member Tags
Add or remove tags from a list member (if a tag does not exist and is set as active, it will be created)
Surveys
- Publish Survey
Publish a survey that is in draft, unpublished, or has been previously published and edited
- List Surveys
Get information about all available surveys for a specific list
- Get Survey
Get details about a specific survey
Contacts
- Create Contact
Create a new omni-channel contact for an audience (BETA feature)
- List Contacts
Get a list of omni-channel contacts for a given audience (BETA feature)
- Get Contact
Retrieve a specific omni-channel contact in an audience (BETA feature)
- Update Contact
Update an existing omni-channel contact (BETA feature)
Facebook Ads
- List Facebook Ads
Get a list of all Facebook ads for the account
- Get Facebook Ad
Get information about a specific Facebook ad
Other (16)
- Create Survey Campaign
Utilize the List ID and Survey ID to generate a Campaign that links to your survey
- Get Template Default Content
Retrieve default content sections for a specific template
- Get Batch Status
Get the status of a batch request
- Search Members
Search for list members across all lists or within a specific list
- Get Landing Page Content
Get the HTML content for your landing page (may require specific plan or permissions)
- Set Campaign Content
Set the HTML or plain-text content for a campaign
- Schedule Campaign
Schedule a campaign for future delivery at a specific time
- Pause Automation
Pause a classic automation workflow that is currently running
- Start Automation
Start a paused or draft automation workflow
- Pause Automation Email
Pause a specific email in an automation workflow
- Start Automation Email
Start a paused automation email
- Start Batch Operation
Begin processing a batch operations request
- Unpublish Landing Page
Unpublish a landing page that is in draft or has been published
- Unpublish Survey
Unpublish a survey that has been published
- Archive Contact
Archive a contact in an audience (BETA feature)
- Forget Contact
Forget a contact (remove all personally identifiable information) from an audience (BETA feature)
Set Up Your Mailchimp MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Mailchimp in under 10 lines of code.
MCP Clients
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Mailchimp MCP Server Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
Mailchimp MCP Server FAQ
Mailchimp MCP server vs direct API integration — what's the difference?
A Mailchimp MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Mailchimp. A Mailchimp MCP server is for AI agents — MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI — discovering and calling Mailchimp at runtime. StackOne provides both.
How does Mailchimp authentication work for AI agents?
Mailchimp authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK — you get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Mailchimp account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via
origin_owner_id.Are Mailchimp MCP tools vulnerable to prompt injection?
Yes — Mailchimp MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content — documents, messages, tickets, records, or free-text fields — is a potential vector. StackOne Defender scans every tool response before it enters the agent's context — regex patterns in ~1ms, then a MiniLM classifier in ~4ms. 88.7% accuracy, CPU-only.
What is the context bloat of a Mailchimp agent and how do I avoid it?
Context bloat happens when Mailchimp tool schemas and API responses eat your Mailchimp agent's memory, preventing it from reasoning effectively. A single Mailchimp query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery and Code Mode reduce context bloat — loading only relevant tools per query and keeping raw responses out of the agent's context.
Can I limit which actions my Mailchimp agent can access?
Yes — you can limit which actions your Mailchimp agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.
Can I create custom agent actions for my Mailchimp MCP server?
Yes — you can create custom agent actions for your Mailchimp MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Mailchimp's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Mailchimp MCP server?
Skip a Mailchimp MCP server if your integration is purely software-to-software — direct Mailchimp API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Mailchimp actions at runtime.
What AI frameworks and AI clients does the StackOne Mailchimp MCP server support?
The StackOne Mailchimp MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.