SendGrid MCP Server

A Model Context Protocol (MCP) server that provides access to SendGrid's Marketing API for email marketing and contact management. https://docs.sendgrid.com/api-reference/how-to-use-the-sendgrid-v3-api

Demo

In this demo, we ask the Cline SendGrid agent to make a new contact list, add my emails to it, automatically generate a template for Lost Cities facts, and send the email to the list. In this process, Cline will automatically realize that it needs to know the verified senders we have, and which unsubscribe group to use. A pretty email is delivered to my inboxes, delighting me with Lost Cities!

Important Note on API Support

This server exclusively supports SendGrid's v3 APIs and does not provide support for legacy functionality. This includes:

• Dynamic templates only - legacy templates are not supported
• Marketing API v3 for all contact & contact list operations
• Single Sends API for bulk email sending

Available Tools

Contact Management

list_contacts

Lists all contacts in your SendGrid account.

// No parameters required

add_contact

Add a contact to your SendGrid marketing contacts.

{
  email: string;           // Required: Contact email address
  first_name?: string;     // Optional: Contact first name
  last_name?: string;      // Optional: Contact last name
  custom_fields?: object;  // Optional: Custom field values
}

delete_contacts

Delete contacts from your SendGrid account.

{
  emails: string[];  // Required: Array of email addresses to delete
}

get_contacts_by_list

Get all contacts in a SendGrid list.

{
  list_id: string;  // Required: ID of the contact list
}

List Management

list_contact_lists

List all contact lists in your SendGrid account.

// No parameters required

create_contact_list

Create a new contact list in SendGrid.

{
  name: string;  // Required: Name of the contact list
}

delete_list

Delete a contact list from SendGrid.

{
  list_id: string;  // Required: ID of the contact list to delete
}

add_contacts_to_list

Add contacts to an existing SendGrid list.

{
  list_id: string;    // Required: ID of the contact list
  emails: string[];   // Required: Array of email addresses to add
}

remove_contacts_from_list

Remove contacts from a SendGrid list without deleting them.

{
  list_id: string;    // Required: ID of the contact list
  emails: string[];   // Required: Array of email addresses to remove
}

Email Sending

send_email

Send an email using SendGrid.

{
  to: string;                             // Required: Recipient email address
  subject: string;                        // Required: Email subject line
  text: string;                          // Required: Plain text content
  from: string;                          // Required: Verified sender email address
  html?: string;                         // Optional: HTML content
  template_id?: string;                  // Optional: Dynamic template ID
  dynamic_template_data?: object;        // Optional: Template variables
}

send_to_list

Send an email to a contact list using SendGrid Single Sends.

{
  name: string;                          // Required: Name of the single send
  list_ids: string[];                    // Required: Array of list IDs to send to
  subject: string;                       // Required: Email subject line
  html_content: string;                  // Required: HTML content
  plain_content: string;                 // Required: Plain text content
  sender_id: number;                     // Required: ID of the verified sender
  suppression_group_id?: number;         // Required if custom_unsubscribe_url not provided
  custom_unsubscribe_url?: string;       // Required if suppression_group_id not provided
}

Template Management (Dynamic Templates Only)

create_template

Create a new dynamic email template.

{
  name: string;           // Required: Name of the template
  subject: string;        // Required: Default subject line
  html_content: string;   // Required: HTML content with handlebars syntax
  plain_content: string;  // Required: Plain text content with handlebars syntax
}

list_templates

List all dynamic email templates.

// No parameters required

get_template

Retrieve a template by ID.

{
  template_id: string;  // Required: ID of the template to retrieve
}

delete_template

Delete a dynamic template.

{
  template_id: string;  // Required: ID of the template to delete
}

Analytics and Validation

get_stats

Get SendGrid email statistics.

{
  start_date: string;                          // Required: Start date (YYYY-MM-DD)
  end_date?: string;                           // Optional: End date (YYYY-MM-DD)
  aggregated_by?: 'day' | 'week' | 'month';    // Optional: Aggregation period
}

validate_email

Validate an email address using SendGrid.

{
  email: string;  // Required: Email address to validate
}

Account Management

list_verified_senders

List all verified sender identities.

// No parameters required

list_suppression_groups

List all unsubscribe groups.

// No parameters required

Installation

git clone https://github.com/Garoth/sendgrid-mcp.git
cd sendgrid-mcp
npm install

Configuration

1. Get your SendGrid API key:

   • Log in to your SendGrid account
   • Go to Settings > API Keys
   • Create a new API key with full access permissions
   • Save the API key securely as it won't be shown again

2. Add it to your Cline MCP settings file inside VSCode's settings (ex. ~/.config/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json):

{
  "mcpServers": {
    "sendgrid": {
      "command": "node",
      "args": ["/path/to/sendgrid-mcp/build/index.js"],
      "env": {
        "SENDGRID_API_KEY": "your-api-key-here"
      },
      "disabled": false,
      "autoApprove": [
        "list_contacts",
        "list_contact_lists",
        "list_templates",
        "list_single_sends",
        "get_single_send",
        "list_verified_senders",
        "list_suppression_groups",
        "get_stats",
        "validate_email"
      ]
    }
  }
}

Note: Tools that modify data (like sending emails or deleting contacts) are intentionally excluded from autoApprove for safety.

Development

Setting Up Tests

The tests use real API calls to ensure accurate responses. To run the tests:

1. Copy the example environment file:

   cp .env.example .env
   

2. Edit .env and add your SendGrid API key:

   SENDGRID_API_KEY=your-api-key-here
   

   Note: The .env file is gitignored to prevent committing sensitive information.

3. Run the tests:

   npm test
   

Building

npm run build

Important Notes

• When sending emails to lists, you must provide either a suppression_group_id or custom_unsubscribe_url to comply with email regulations
• Sender email addresses must be verified with SendGrid before they can be used to send emails
• All templates are created as dynamic templates with support for handlebars syntax (e.g., {{variable_name}})
• The Single Sends API is used for all bulk email operations as it provides better tracking and management capabilities
• The SendGrid API is "eventually consistent" - data changes (like adding contacts or updating lists) may not appear immediately after being made

License

MIT

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