Connect
Optimize
Secure
ActiveCampaign MCP Server
for AI Agents
Production-ready ActiveCampaign MCP server with 23 extensible actions — plus built-in authentication, security, and optimized execution.
ActiveCampaign MCP Server
Built by 
StackOne
StackOne 
Coverage
23 Agent Actions
Create, read, update, and delete across ActiveCampaign — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your ActiveCampaign MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every ActiveCampaign 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 ActiveCampaign call.
Tools Discovery →What is the ActiveCampaign MCP Server?
A ActiveCampaign MCP server lets AI agents read and write ActiveCampaign data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's ActiveCampaign MCP server ships with 23 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 ActiveCampaign MCP Tools and Actions
Every action from ActiveCampaign's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Contacts
- Create Contact
Create a new contact in ActiveCampaign
- List Contacts
List, search, and filter contacts in ActiveCampaign
- Get Contact
Retrieve a specific contact by ID
- Update Contact
Update an existing contact in ActiveCampaign
- Delete Contact
Delete a contact from ActiveCampaign
Contact Activities
- List Contact Activities
List a contact's recent activities including emails sent, opens, clicks, and other interactions
Tag To Contacts
- Add Tag To Contact
Add a tag to a contact for segmentation and automation
Tag From Contacts
- Remove Tag From Contact
Remove a tag from a contact
Campaigns
- List Campaigns
List all email campaigns in ActiveCampaign
- Get Campaign
Retrieve a specific campaign by ID
Messages
- Create Message
Create a new email message template in ActiveCampaign
- List Messages
List all email messages (templates) in ActiveCampaign
- Get Message
Retrieve a specific message (template) by ID
- Update Message
Update an existing message template
Lists
- List Lists
Retrieve all lists (contact groups) in ActiveCampaign
Create Lists
- Create List
Create a new contact list in ActiveCampaign
Get Lists
- Get List
Retrieve a specific list by ID
Tags
- List Tags
List all tags in ActiveCampaign
- Get Tag
Retrieve a specific tag by ID
Accounts
- List Accounts
List all accounts (companies/organizations) in ActiveCampaign
- Get Account
Retrieve a specific account by ID
Deals
- List Deals
List all deals in ActiveCampaign CRM
- Get Deal
Retrieve a specific deal by ID
Set Up Your ActiveCampaign MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to ActiveCampaign 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>"
]
}
}
}ActiveCampaign 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
ActiveCampaign MCP Server FAQ
ActiveCampaign MCP server vs direct API integration — what's the difference?
A ActiveCampaign MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling ActiveCampaign. A ActiveCampaign 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 ActiveCampaign at runtime. StackOne provides both.
How does ActiveCampaign authentication work for AI agents?
ActiveCampaign 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 ActiveCampaign account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via
origin_owner_id.Are ActiveCampaign MCP tools vulnerable to prompt injection?
Yes — ActiveCampaign 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 ActiveCampaign agent and how do I avoid it?
Context bloat happens when ActiveCampaign tool schemas and API responses eat your ActiveCampaign agent's memory, preventing it from reasoning effectively. A single ActiveCampaign 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 ActiveCampaign agent can access?
Yes — you can limit which actions your ActiveCampaign 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 ActiveCampaign MCP server?
Yes — you can create custom agent actions for your ActiveCampaign MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research ActiveCampaign's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a ActiveCampaign MCP server?
Skip a ActiveCampaign MCP server if your integration is purely software-to-software — direct ActiveCampaign 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 ActiveCampaign actions at runtime.
What AI frameworks and AI clients does the StackOne ActiveCampaign MCP server support?
The StackOne ActiveCampaign 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.