Connect
Optimize
Secure
Constant Contact MCP Server
for AI Agents
Production-ready Constant Contact MCP server with 61 extensible actions — plus built-in authentication, security, and optimized execution.
Constant Contact MCP Server
Built by 
StackOne
StackOne 
Coverage
61 Agent Actions
Create, read, update, and delete across Constant Contact — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Constant Contact MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Constant Contact 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 Constant Contact call.
Tools Discovery →What is the Constant Contact MCP Server?
A Constant Contact MCP server lets AI agents read and write Constant Contact data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Constant Contact MCP server ships with 61 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 Constant Contact MCP Tools and Actions
Every action from Constant Contact's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Account Summarys
- Get Account Summary
Retrieve details about the Constant Contact account
- Update Account Summary
Update account details such as name, website, and contact information
Account Physical Address
- Create Account Physical Address
Add the organization's physical address to the Constant Contact account
- Get Account Physical Address
Retrieve the organization's physical address on file
- Update Account Physical Address
Update the organization's physical address on the Constant Contact account
Account Emails
- Create Account Email
Add a new email address to the Constant Contact account
- List Account Emails
List email addresses associated with the Constant Contact account
Contacts
- Create Contact
Create a new contact in Constant Contact
- List Contacts
Retrieve a paginated list of contacts with optional filtering
- Get Contact
Retrieve a specific contact by their unique ID
- Update Contact
Update an existing contact's information by ID
- Delete Contact
Delete a contact by their unique ID
Contact Lists
- Create Contact List
Create a new contact list in the account
- List Contact Lists
Retrieve all contact lists in the account
- Get Contact List
Retrieve a specific contact list by its unique ID
- Update Contact List
Update the name, description, or favorite status of a contact list
- Delete Contact List
Delete a contact list by its unique ID
Custom Fields
- Create Custom Field
Create a new custom field definition for contacts
- List Custom Fields
Retrieve all custom field definitions in the account
- Get Custom Field
Retrieve a specific custom field definition by its unique ID
- Update Custom Field
Update an existing custom field's label or choices
- Delete Custom Field
Delete a custom field definition by its unique ID
Events
- Create Event
Create a new event with default settings, registration form, and landing page
- List Events
Retrieve a collection of events with event details
- Get Event
Retrieve details for a specific event by its unique ID
- Update Event
Partially update an event with the provided fields
Segments
- Create Segment
Create a new segment with filter criteria
- List Segments
Retrieve all segments defined in the account
- Get Segment
Retrieve a specific segment by its unique ID
- Update Segment
Update an existing segment's name and filter criteria
- Delete Segment
Delete a segment by its unique ID
Email Campaigns
- Create Email Campaign
Create a new email campaign
- List Email Campaigns
Retrieve all email campaigns in the account
- Get Email Campaign
Retrieve a specific email campaign by its unique ID
- Delete Email Campaign
Delete an email campaign by its unique ID
Campaign Activitys
- Get Campaign Activity
Retrieve a specific email campaign activity by its unique ID
- Update Campaign Activity
Update the content and settings of an email campaign activity
Tags
- Create Tag
Create a new contact tag with a unique name
- List Tags
Retrieve all contact tags in the account
- Get Tag
Retrieve details for a specific contact tag by its unique ID
- Update Tag
Rename an existing contact tag
- Delete Tag
Delete a contact tag and unassign it from all contacts
Other (19)
- Create Or Update Contact
Create a new contact or update an existing one via sign-up form
- Get User Privileges
Retrieve the privileges associated with the authenticated user
- List Bulk Activities
Retrieve the status of all bulk activities (async jobs) in the account
- Get Bulk Activity
Retrieve the status and details of a specific bulk activity by its unique ID
- List Email Campaign Summary Reports
Retrieve aggregate statistics for email campaigns
- Get Email Campaign Stats
Retrieve performance tracking statistics for one or more email campaigns
- Get Email Campaign Activity Stats
Retrieve performance tracking statistics for up to ten email campaign activities
- Get Email Links Report
Retrieve link click counts for a specific email campaign activity
- Get Email Sends Report
Retrieve a list of contacts that were sent a specific email campaign activity
- Get Email Opens Report
Retrieve each time a contact opened a specific email campaign activity
- Get Email Unique Opens Report
Retrieve the last time each contact opened a specific email campaign activity
- Get Email Did Not Opens Report
Retrieve contacts that were sent but did not open a specific email campaign activity
- Get Email Clicks Report
Retrieve each time a contact clicked a link in a specific email campaign activity
- Get Email Forwards Report
Retrieve each time a contact forwarded a specific email campaign activity
- Get Email Opt-outs Report
Retrieve contacts that unsubscribed via a specific email campaign activity
- Get Email Bounces Report
Retrieve contact bounce data for a specific email campaign activity
- List Contact Activity Reports
Retrieve a contact's tracking activities across all campaigns
- Update Email Campaign Name
Rename an email campaign
- Rename Segment
Rename an existing segment without modifying its criteria
Set Up Your Constant Contact MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Constant Contact 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>"
]
}
}
}Constant Contact 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
Constant Contact MCP Server FAQ
Constant Contact MCP server vs direct API integration — what's the difference?
A Constant Contact MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Constant Contact. A Constant Contact 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 Constant Contact at runtime. StackOne provides both.
How does Constant Contact authentication work for AI agents?
Constant Contact 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 Constant Contact account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via
origin_owner_id.Are Constant Contact MCP tools vulnerable to prompt injection?
Yes — Constant Contact 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 Constant Contact agent and how do I avoid it?
Context bloat happens when Constant Contact tool schemas and API responses eat your Constant Contact agent's memory, preventing it from reasoning effectively. A single Constant Contact 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 Constant Contact agent can access?
Yes — you can limit which actions your Constant Contact 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 Constant Contact MCP server?
Yes — you can create custom agent actions for your Constant Contact MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Constant Contact's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Constant Contact MCP server?
Skip a Constant Contact MCP server if your integration is purely software-to-software — direct Constant Contact 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 Constant Contact actions at runtime.
What AI frameworks and AI clients does the StackOne Constant Contact MCP server support?
The StackOne Constant Contact 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.