SendGrid MCP Server

A Model Context Protocol (MCP) server that provides comprehensive access to SendGrid's API v3 for email marketing, transactional email operations, dynamic template management, and detailed analytics. Features 154 tools covering all aspects of email management and performance analysis.

*Built and maintained by a SendGrid engineer, as an independent project — not an official SendGrid product.*

> See RELEASES.md for what's changed in the latest release.

Features

• Marketing Automations: Create and manage email automation workflows
• Single Send Campaigns: Manage one-time email campaigns with detailed performance tracking
• Contact Management: Complete CRUD operations for contacts with advanced search and bulk operations
• Email Statistics & Analytics: Multi-dimensional performance analysis across browsers, devices, geography, and email providers with 13-month historical data
• Dynamic Segment Management: Create, update, and delete contact segments with complex filtering criteria that automatically refresh
• Dynamic Template Management: Create, manage, and version HTML email templates with Handlebars support for personalization
• Custom Fields Management: Define and manage additional contact data fields for enhanced targeting
• Mail Sending: Send transactional emails via SendGrid with full personalization support
• Sender Identity Management: Manage verified sender identities with authentication tracking
• Suppression Lists: Manage bounces, spam reports, and unsubscribes for deliverability optimization
• Account Settings: Access account details and configuration management
• Browser Integration: Quick links to SendGrid web interface for visual operations
• Read-Only Safety Mode: Secure operation mode prevents accidental data modification while maintaining full analytics access

Supported MCP Clients

✅ Claude Desktop - Official desktop app

✅ Claude Code - Official CLI tool

✅ Claude custom connectors - via Streamable HTTP (see Install the server)

✅ OpenAI Responses API / Apps SDK - via Streamable HTTP

✅ MCP Market - Hosted, one-click deploy, no install required (see Install the server)

✅ Cline - VS Code extension

✅ Zed Editor - Modern code editor

✅ Continue - VS Code autopilot

✅ Codex CLI - via Streamable HTTP

✅ Any MCP-compatible client

Getting Started

Follow these steps in order — by the end you'll have the server installed (or deployed), your SendGrid API key set, and your MCP client connected.

This is the actual request path, whichever client you end up using — some

launch the server locally over stdio, others reach it over the network via

Streamable HTTP (MCP Market, self-hosted), which adds a choice of client

auth on top:

┌──────────┐
                                │  Client  │
                                └────┬─────┘
              ┌──────────────────────┴───────────────────┐
              │                                          │
           stdio (local subprocess)        HTTP (network)
              │               auth: none | token | oauth │
              │                                          │
              └──────────────────────┬───────────────────┘
                                     ▼
                           ┌────────────────────┐
                           │     MCP Server     │
                           │    (this repo)     │
                           └─────────┬──────────┘
                                     │  SENDGRID_API_KEY
                                     │  (always required, any transport)
                                     ▼
                           ┌────────────────────┐
                           │    SendGrid API    │
                           └────────────────────┘

`SENDGRID_API_KEY` is required no matter which path you take. `READ_ONLY=true`

(the default) is a further gate *inside* the MCP Server box — it blocks

create/update/delete/send tools once a request is already in, regardless of

which branch it arrived on. See Environment Variables

for the full list of what you can configure.

1. Install the server

Install it locally if your client launches it itself, or go remote if it connects over the network instead.

Local (stdio) — for Claude Desktop, Claude Code, Cline, Zed, Continue, or any client that runs the server as a subprocess:

npm install -g sendgrid-mcp

This installs the `sendgrid-mcp` command globally, which your MCP client will launch as a subprocess. Requires Node.js 20+.

Remote (HTTP) — nothing to install locally; pick one:

MCP Market (hosted, no install required)

MCP Market deploys and hosts this server for you — nothing to install locally and no environment variables to manage on your machine. You still need a SendGrid API key; you'll enter it into MCP Market instead of your own shell/config.

From MCP Market's MCP Servers page, deploy a custom MCP from either source:

• GitHub — select the GitHub source, choose Public or Private repo, paste

the repo URL (`https://github.com/deyikong/sendgrid-mcp`), and pick a

server name.

• npm — select the npm source, enter the package name (`sendgrid-mcp`),

and pick a server name.

Either way, MCP Market builds and runs it for you; it shows up under

MCP Servers with a `Running` status once ready. Continue to

Configure your MCP client to set your

credentials and connect.

Self-hosted (Streamable HTTP)

Run the server yourself and expose it over Streamable HTTP instead of letting

a client launch it locally — for Claude custom connectors, OpenAI's Responses

API `mcp` tool / Apps SDK, or any other remote client.

The MCP endpoint is `POST /mcp`; `GET /health` returns a status document for

load balancers. Requests are handled statelessly (no session id required),

which is what hosted clients expect.

`none`/`token`/`oauth` below are not alternate ways to *connect* — they're

three different locks on the one new door (HTTP), as shown in the

request-flow diagram above.

Quick start (local development)

export SENDGRID_API_KEY="SG.your_api_key_here"
export MCP_TRANSPORT=http
export MCP_AUTH_MODE=token
export MCP_AUTH_TOKEN="$(openssl rand -hex 32)"

sendgrid-mcp

Authentication

Set `MCP_AUTH_MODE` to one of:

OAuth mode makes this server an OAuth 2.1 resource server. It does not

issue or store credentials — it verifies access tokens minted by your existing

identity provider (Auth0, Okta, Entra ID, Google, Stytch, …) against that

provider's published JWKS.

export MCP_AUTH_MODE=oauth
export MCP_OAUTH_ISSUER="https://your-tenant.auth0.com"
export MCP_OAUTH_AUDIENCE="https://mcp.example.com"
export MCP_OAUTH_REQUIRED_SCOPES="sendgrid:read"
export MCP_PUBLIC_URL="https://mcp.example.com"

`SENDGRID_API_KEY` (see the diagram in Getting Started)

is still required alongside these — OAuth only controls who can reach the server, not what the server

uses to talk to SendGrid.

The server publishes RFC 9728

Protected Resource Metadata at `/.well-known/oauth-protected-resource`, so

clients discover your authorization server automatically: an unauthenticated

request gets a `401` whose `WWW-Authenticate` header points at that document,

the client reads it, sends the user to your IdP to log in, and retries with the

resulting token.

Tokens are rejected (`401`) if expired, wrongly signed, or issued for a

different issuer or audience; a valid token missing a required scope gets `403`.

Setting up your identity provider

Whichever provider you use, you're configuring the same three things: an

issuer URL, an audience (a stable identifier for this API resource),

and a scope clients will request. A few concrete walkthroughs:

Auth0

1. Sign in to your Auth0 Dashboard and go to

Applications → APIs → Create API.

2. Set an Identifier — this is your audience, e.g.

`https://mcp.example.com`. It doesn't need to resolve to anything; it just

needs to be unique.

3. Under the API's Permissions tab, add the scopes your server should

require, e.g. `sendgrid:read`, `sendgrid:write`.

4. Your Issuer URL is your tenant domain, shown on the API's *Settings*

tab: `https://YOUR_TENANT.auth0.com/`.

export MCP_OAUTH_ISSUER="https://YOUR_TENANT.auth0.com/"
export MCP_OAUTH_AUDIENCE="https://mcp.example.com"
export MCP_OAUTH_REQUIRED_SCOPES="sendgrid:read"

Okta

1. Sign in to the Okta Admin Console and go to

Security → API → Authorization Servers.

2. Use the `default` authorization server, or create a new one. Its

Issuer URI, shown at the top of the server's settings page, looks like

`https://{yourOktaDomain}/oauth2/{authServerId}`.

3. On the same page, the Audience field (default `api://default`) is what

you'll use for the audience — set it to something specific to this server,

e.g. `api://sendgrid-mcp`.

4. Open the Scopes tab and add a scope, e.g. `sendgrid:read`.

export MCP_OAUTH_ISSUER="https://YOUR_OKTA_DOMAIN/oauth2/YOUR_AUTH_SERVER_ID"
export MCP_OAUTH_AUDIENCE="api://sendgrid-mcp"
export MCP_OAUTH_REQUIRED_SCOPES="sendgrid:read"

Microsoft Entra ID (Azure AD)

1. In the Azure Portal, go to

Microsoft Entra ID → App registrations → New registration to represent

this MCP server as a resource.

2. Open the new app's Expose an API page and set the

Application ID URI — this becomes your audience, e.g.

`api://`.

3. On the same page, click Add a scope to define one, e.g.

`sendgrid.read`.

4. Your Issuer URL is `https://login.microsoftonline.com/{tenant-id}/v2.0`,

where `{tenant-id}` is the directory (tenant) ID from the app's

Overview page.

export MCP_OAUTH_ISSUER="https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0"
export MCP_OAUTH_AUDIENCE="api://YOUR_CLIENT_ID"
export MCP_OAUTH_REQUIRED_SCOPES="sendgrid.read"

Other providers (Google Identity Platform, Stytch, …) follow the same shape:

find the OpenID Connect issuer (usually published at

`/.well-known/openid-configuration`), define an audience/resource

identifier for this server, and create a scope for it.

Whichever provider you use, also set `MCP_PUBLIC_URL` to the

externally-reachable URL of your server (e.g. `https://mcp.example.com`) —

clients use it during OAuth discovery.

TLS

Either terminate TLS in-process:

export TLS_KEY_FILE=/etc/ssl/private/mcp.key
export TLS_CERT_FILE=/etc/ssl/certs/mcp.crt
export TLS_CA_FILE=/etc/ssl/certs/chain.pem   # optional intermediates

…or terminate it at a proxy and tell the server to trust the forwarded headers:

export TRUST_PROXY=true
export MCP_PUBLIC_URL="https://mcp.example.com"

`TRUST_PROXY` is off by default because `X-Forwarded-*` headers are

client-controlled unless a proxy you control overwrites them. TLS 1.2 is the

enforced minimum in in-process mode.

Connecting clients

OpenAI (Responses API):

{
  "model": "gpt-5",
  "tools": [{
    "type": "mcp",
    "server_label": "sendgrid",
    "server_url": "https://mcp.example.com/mcp",
    "authorization": "ACCESS_TOKEN"
  }],
  "input": "List my SendGrid automations"
}

Claude (custom connector): add `https://mcp.example.com/mcp` as a custom

connector. In `oauth` mode Claude walks the discovery flow and prompts the user

to log in; in `token` mode supply the bearer token directly.

Security

The server refuses to start on misconfigurations that would quietly expose your

SendGrid account, rather than coming up in a weaker mode than you intended:

• Binding to a non-loopback address without either TLS or `TRUST_PROXY`
• `MCP_AUTH_MODE=none` on anything but a loopback bind
• An `http://` `MCP_PUBLIC_URL` that is not loopback
• A missing or under-length `MCP_AUTH_TOKEN`, or `oauth` mode without an issuer

and audience

• `TLS_KEY_FILE` and `TLS_CERT_FILE` set only one of the pair

Beyond that:

• Keep `READ_ONLY=true` unless you need write and send operations. This is

the single most effective limit on blast radius — it is the difference

between a leaked token exposing analytics and one sending mail from your

domain.

• Set `MCP_ALLOWED_HOSTS` / `MCP_ALLOWED_ORIGINS` to enable DNS-rebinding

protection, which matters most for locally bound servers reachable from a

browser.

• Scope your SendGrid API key to only the permissions this server needs;

the key is the real credential behind every request.

2. Get your SendGrid API key

1. Go to SendGrid API Keys

2. Click "Create API Key"

3. Choose "Full Access" or select specific permissions

4. Copy the generated key (starts with `SG.`)

3. Configure your MCP client

MCP Market

Once your server is deployed (see Install the server),

set your credentials and connect a client.

Set your environment variables

Open your deployed server → the Variables tab → My Credentials, and

fill in:

Each field saves independently — only `SENDGRID_API_KEY` is required.

Connect a client

Click + Connect on your server's page. MCP Market shows one-click

install options for Claude Desktop, Claude Code, Codex CLI, Cursor, VS Code,

Windsurf, Cline, JetBrains, Gemini CLI, Amazon Q, Goose, and Continue — pick

yours and follow its prompt.

For any other client, use the Connection URL option instead, which gives

you a Streamable HTTP endpoint unique to your deployment. The examples below

use `deyikong/sendgrid-mcp` for illustration — yours will have your own

username and server name:

https://link.mcpmarket.com///mcp

Wire it up the same way as any other self-hosted

endpoint, e.g.:

# Claude Code
claude mcp add --transport http sendgrid https://link.mcpmarket.com///mcp

# Codex CLI
codex mcp add sendgrid --url https://link.mcpmarket.com///mcp

MCP Market manages hosting, TLS, and availability for the deployed server; for account, billing, or deployment questions, refer to MCP Market directly rather than this repository.

Claude Desktop

The official Claude desktop application with native MCP support.

Configuration File Locations:

• macOS: `~/Library/Application Support/Claude/claude_desktop_config.json`
• Windows: `%APPDATA%/Claude/claude_desktop_config.json`

Configuration:

{
  "mcpServers": {
    "sendgrid": {
      "command": "sendgrid-mcp",
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "true"
      }
    }
  }
}

Optional Configuration:

{
  "mcpServers": {
    "sendgrid": {
      "command": "sendgrid-mcp",
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "false",
        "LOG_LEVEL": "info",
        "REQUEST_TIMEOUT": "30000"
      }
    }
  }
}

After configuration:

1. Save the file

2. Restart Claude Desktop

3. The SendGrid MCP server will be available in Claude

Claude Code (CLI)

Claude's official command-line interface with MCP support.

Installation:

npm install -g @anthropic-ai/claude-code

Configuration File Location:

• All platforms: `~/.claude/config.json`

Configuration:

{
  "mcpServers": {
    "sendgrid": {
      "command": "sendgrid-mcp",
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "true"
      }
    }
  }
}

Usage:

# Start Claude Code with SendGrid MCP
claude

# The SendGrid tools will be automatically available
# Ask Claude: "List my SendGrid automations"

Cline (VS Code Extension)

Popular VS Code extension with MCP support.

Installation:

1. Install the Cline extension from VS Code marketplace

2. Open Cline settings

Configuration File:

• Open VS Code Settings
• Search for "Cline: MCP Settings"
• Edit the MCP configuration JSON

Configuration:

{
  "mcpServers": {
    "sendgrid": {
      "command": "sendgrid-mcp",
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "true"
      }
    }
  }
}

Zed Editor

Modern code editor with built-in AI and MCP support.

Configuration File Location:

• macOS/Linux: `~/.config/zed/settings.json`
• Windows: `%APPDATA%/Zed/settings.json`

Configuration:

{
  "context_servers": {
    "sendgrid-mcp": {
      "command": "sendgrid-mcp",
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "true"
      }
    }
  }
}

Continue (VS Code Extension)

Open-source autopilot for VS Code with MCP support.

Configuration File Location:

• All platforms: `~/.continue/config.json`

Configuration:

{
  "experimental": {
    "modelContextProtocolServers": [
      {
        "command": "sendgrid-mcp",
        "env": {
          "SENDGRID_API_KEY": "SG.your_api_key_here",
          "READ_ONLY": "true"
        }
      }
    ]
  }
}

Generic MCP Client

For any MCP-compatible client not listed above:

Command Line:

# With environment variables
SENDGRID_API_KEY="SG.your_api_key_here" READ_ONLY="true" sendgrid-mcp

Configuration Template:

{
  "command": "sendgrid-mcp",
  "env": {
    "SENDGRID_API_KEY": "SG.your_api_key_here",
    "READ_ONLY": "true"
  }
}

Environment Variables

The server is configured entirely through environment variables. `SENDGRID_API_KEY` is the only required one.

`READ_ONLY` defaults to `true`. In this mode every tool is registered and visible, but operations that create, update, delete, or send are blocked at runtime with a clear error message — only list/get/search/browser-link tools actually run. This is the safest default while you're getting set up. See Read-Only Mode for the full breakdown of what's blocked, and set `READ_ONLY=false` once you're ready to allow write and send operations.

These variables are set inside your MCP client's configuration (as an `env` block) — see Configure your MCP client. Self-hosted HTTP mode has its own set of variables (transport, auth, TLS) — see Install the server.

Read-Only Mode

Read-Only Mode

By default, the SendGrid MCP server runs in read-only mode (`READ_ONLY=true`) for safety. All tools are registered and available, but mutable operations are blocked at runtime with helpful error messages.

How Read-Only Mode Works

When `READ_ONLY=true` (default):

• All tools are registered and visible to the AI assistant
• Non-mutating operations work normally (list, get, search, open browser links)
• Mutating operations are blocked with a clear error message:

❌ Operation blocked: Server is running in READ_ONLY mode. Set READ_ONLY=false in your environment to enable write operations.

Read-Only Safe Operations

These 32 operations work normally when `READ_ONLY=true`:

Automations & Campaigns:

• `list_automations`, `get_automation`, `open_automation_creator`, `open_automation_editor`
• `list_single_sends`, `get_single_send`, `open_single_send_creator`, `open_single_send_stats`

Contacts, Lists & Segments:

• `list_contacts`, `get_contact`, `search_contacts`, `search_contacts_by_emails`
• `list_email_lists`
• `list_segments`, `open_segment_creator`
• `list_custom_fields`

Senders:

• `list_senders`, `open_csv_uploader`

Templates:

• `list_templates`, `get_template`, `get_template_version`, `open_template_editor`

Statistics (all read-only by design):

• `get_global_stats`, `get_stats_overview`, `get_stats_by_browser`, `get_stats_by_client_type`, `get_stats_by_device_type`, `get_stats_by_mailbox_provider`, `get_stats_by_country`, `get_category_stats`, `get_subuser_stats`

Utilities:

• `get_scopes`

Blocked Operations in Read-Only Mode

These 26 operations are blocked when `READ_ONLY=true`:

• `update_automation_settings`, `update_automation_step`, `delete_automation`
• `create_contact`, `update_contact`, `delete_contact`
• `create_contact_with_lists`, `remove_contact_from_lists`
• `create_email_list`, `update_email_list`, `delete_email_list`
• `create_custom_field`, `update_custom_field`, `delete_custom_field`
• `create_sender`, `delete_sender`
• `update_segment`, `delete_segment`
• `create_template`, `update_template`, `delete_template`
• `create_template_version`, `update_template_version`, `delete_template_version`
• `create_html_template`
• `send_mail`

Full Access Mode

To enable create, update, delete, and send operations, set `READ_ONLY=false` in your MCP client's `env` block:

{
  "env": {
    "SENDGRID_API_KEY": "SG.your_api_key_here",
    "READ_ONLY": "false"
  }
}

This will allow all mutating operations to execute normally while maintaining all read operations.

⚠️ Security Note: Only disable read-only mode if you need write access and trust the environment where the server is running.

Available Tools

The server exposes 154 tools grouped into 22 categories. Every tool is registered regardless of `READ_ONLY` mode — see Read-Only Mode for which ones are blocked by default.

📚 **For natural-language prompts you can say directly to Claude, see EXAMPLE_PROMPTS.md.** The examples below show the underlying JSON tool calls.

Tools Summary

API Keys, Alerts, Teammates, and Dedicated IPs are deliberately read-only in this server, and SSO/certificate management isn't exposed at all — see Intentionally Unsupported Operations for why.

Marketing Automations

• `list_automations` - List all marketing automations with metadata
• `get_automation` - Get detailed information about a specific automation
• `update_automation_settings` - Update automation-level settings (name, status)
• `update_automation_step` - Update individual step settings (status, wait time)
• `delete_automation` - Permanently delete an automation
• `open_automation_creator` - Open automation creator in browser
• `open_automation_editor` - Open specific automation editor

Examples

Example — get automation details:

{
  "tool": "get_automation",
  "arguments": {
    "automation_id": "automation_id_here"
  }
}

Example — pause an entire automation:

{
  "tool": "update_automation_settings",
  "arguments": {
    "automation_id": "automation_id_here",
    "status": "paused"
  }
}

Example — update a single step (status, wait time):

{
  "tool": "update_automation_step",
  "arguments": {
    "automation_id": "automation_id_here",
    "step_id": "step_id_here",
    "step_status": "active",
    "wait_time": 1440
  }
}

Example — delete an automation:

{
  "tool": "delete_automation",
  "arguments": {
    "automation_id": "automation_id_here"
  }
}

Single Send Campaigns

• `list_single_sends` - List all single send campaigns with metadata
• `get_single_send` - Retrieve detailed content and settings for a single send campaign
• `open_single_send_creator` - Open campaign creator in browser for visual design
• `open_single_send_stats` - View detailed campaign performance statistics

Examples

Example — get a campaign's content and settings:

{
  "tool": "get_single_send",
  "arguments": {
    "singlesend_id": "singlesend_id_here"
  }
}

Contact CRUD Operations

• `list_contacts` - List all contacts with pagination and filtering
• `get_contact` - Get detailed information about a specific contact
• `create_contact` - Create new contacts with custom fields
• `update_contact` - Update existing contact information and custom data
• `delete_contact` - Delete contacts permanently with cleanup
• `search_contacts` - Search for contacts using advanced query conditions
• `search_contacts_by_emails` - Search for specific contacts by email addresses

Examples

Example — create a new contact:

{
  "tool": "create_contact",
  "arguments": {
    "contacts": [
      {
        "email": "newuser@example.com",
        "first_name": "Jane",
        "last_name": "Smith"
      }
    ]
  }
}

Example — search for contacts by email:

{
  "tool": "search_contacts_by_emails",
  "arguments": {
    "emails": ["john@example.com", "jane@example.com"]
  }
}

Example — search contacts with a query condition:

{
  "tool": "search_contacts",
  "arguments": {
    "query": "email LIKE '@example.com'",
    "page_size": 10
  }
}

Example — update a contact:

{
  "tool": "update_contact",
  "arguments": {
    "contacts": [
      {
        "id": "contact_id_here",
        "first_name": "John",
        "last_name": "Updated"
      }
    ]
  }
}

Example — delete contacts:

{
  "tool": "delete_contact",
  "arguments": {
    "contact_ids": ["contact_id_1", "contact_id_2"]
  }
}

Email List Management

• `list_email_lists` - List all email lists
• `create_email_list` - Create a new email list
• `update_email_list` - Update email list properties
• `delete_email_list` - Delete an email list
• `create_contact_with_lists` - Create contacts and assign to lists
• `remove_contact_from_lists` - Remove contacts from a specific list

Examples

Example — list email lists:

{
  "tool": "list_email_lists",
  "arguments": {
    "page_size": 100
  }
}

Example — rename an email list:

{
  "tool": "update_email_list",
  "arguments": {
    "list_id": "list_id_here",
    "name": "Updated List Name"
  }
}

Example — remove contacts from a list:

{
  "tool": "remove_contact_from_lists",
  "arguments": {
    "list_id": "list_id_here",
    "contact_ids": ["contact_id_1", "contact_id_2"]
  }
}

Example — delete an email list:

{
  "tool": "delete_email_list",
  "arguments": {
    "list_id": "list_id_here"
  }
}

Segments & Custom Fields

• `list_segments` - List dynamic segments with parent relationships and criteria
• `open_segment_creator` - Open segment creator in browser for visual query building
• `update_segment` - Update existing segment name or query criteria with real-time refresh
• `delete_segment` - Delete an existing segment (contacts remain unaffected)
• `list_custom_fields` - List custom field definitions with data types
• `create_custom_field` - Create new custom fields (Text, Number, Date types)
• `update_custom_field` - Update existing custom field definitions
• `delete_custom_field` - Delete custom field definitions with data cleanup

Examples

Example — rename a segment:

{
  "tool": "update_segment",
  "arguments": {
    "segment_id": "segment_id_here",
    "name": "Updated Segment Name"
  }
}

Example — update a segment's query criteria:

{
  "tool": "update_segment",
  "arguments": {
    "segment_id": "segment_id_here",
    "query_dsl": "{\"and\": [{\"field\": \"email\", \"value\": \"@example.com\", \"operator\": \"like\"}]}"
  }
}

Example — delete a segment:

{
  "tool": "delete_segment",
  "arguments": {
    "segment_id": "segment_id_here"
  }
}

Example — create a custom field:

{
  "tool": "create_custom_field",
  "arguments": {
    "name": "customer_tier",
    "field_type": "Text"
  }
}

Example — update a custom field:

{
  "tool": "update_custom_field",
  "arguments": {
    "field_id": "field_id_here",
    "name": "customer_level"
  }
}

Example — delete a custom field:

{
  "tool": "delete_custom_field",
  "arguments": {
    "field_id": "field_id_here"
  }
}

Senders & Import

• `list_senders` - List verified sender identities
• `create_sender` - Create new sender identity
• `delete_sender` - Delete a verified sender identity
• `open_csv_uploader` - Open CSV upload interface

Examples

Example — create a sender identity:

{
  "tool": "create_sender",
  "arguments": {
    "nickname": "Marketing Team",
    "from": { "email": "marketing@yourdomain.com", "name": "Your Company" },
    "reply_to": { "email": "replies@yourdomain.com", "name": "Your Company" },
    "address": "123 Main St",
    "city": "Denver",
    "state": "CO",
    "zip": "80202",
    "country": "United States"
  }
}

Example — delete a sender identity:

{
  "tool": "delete_sender",
  "arguments": {
    "sender_id": "sender_id_here"
  }
}

Dynamic Templates

• `list_templates` - List all dynamic and legacy templates
• `get_template` - Get details of a specific template including all versions
• `create_template` - Create a new dynamic template
• `update_template` - Update template name and settings
• `delete_template` - Delete a template and all its versions
• `create_template_version` - Create a new version with HTML content and settings
• `get_template_version` - Get details of a specific template version
• `update_template_version` - Update version content, subject, and settings
• `delete_template_version` - Delete a specific template version
• `create_html_template` - Create complete template with HTML content in one step (perfect for AI agents)
• `open_template_editor` - Open SendGrid's visual template editor in browser

Templates support Handlebars syntax for dynamic content (`{{variable}}`, `{{#each}}`, `{{#if}}`), responsive HTML with inline CSS, up to 300 versions per template, test-data previews, and automatic plain-text generation.

Examples

Example — create a complete template in one step (best for AI agents):

{
  "tool": "create_html_template",
  "arguments": {
    "template_name": "Welcome Email",
    "version_name": "Version 1.0",
    "subject": "Welcome to {{companyName}}, {{firstName}}!",
    "html_content": "WelcomeWelcome {{firstName}}!Thank you for joining {{companyName}}. We're excited to have you on board.",
    "test_data": "{\"firstName\":\"John\",\"companyName\":\"Acme Corp\"}"
  }
}

Example — add a new version with HTML content:

{
  "tool": "create_template_version",
  "arguments": {
    "template_id": "your_template_id",
    "name": "Newsletter v1.0",
    "subject": "{{month}} Newsletter - {{companyName}}",
    "html_content": "{{month}} Newsletter{{#each articles}}{{/each}}",
    "test_data": "{\"month\":\"January\",\"companyName\":\"Acme\",\"articles\":[{\"title\":\"Article 1\",\"summary\":\"Summary here\",\"link\":\"https://example.com\"}]}"
  }
}

Mail Sending

• `send_mail` - Send transactional emails (supports templates with dynamic template data)

Examples

Example — send a simple email:

{
  "tool": "send_mail",
  "arguments": {
    "personalizations": [
      {
        "to": [{"email": "recipient@example.com", "name": "John Doe"}],
        "subject": "Hello from SendGrid MCP!"
      }
    ],
    "from": {"email": "sender@yourdomain.com", "name": "Your Name"},
    "content": [
      {
        "type": "text/plain",
        "value": "Hello! This email was sent via SendGrid MCP server."
      }
    ]
  }
}

Example — send using a dynamic template:

{
  "tool": "send_mail",
  "arguments": {
    "personalizations": [
      {
        "to": [{"email": "user@example.com", "name": "John Doe"}],
        "dynamic_template_data": {
          "firstName": "John",
          "companyName": "Acme Corp",
          "orderNumber": "12345",
          "items": [
            {"name": "Product A", "price": "29.99"},
            {"name": "Product B", "price": "19.99"}
          ]
        }
      }
    ],
    "from": {"email": "noreply@yourcompany.com", "name": "Your Company"},
    "template_id": "d-1234567890abcdef1234567890abcdef"
  }
}

Email Statistics & Analytics

• `get_global_stats` - Retrieve overall email performance metrics
• `get_stats_overview` - Get comprehensive statistics across multiple dimensions
• `get_stats_by_browser` - Statistics broken down by browser type (Chrome, Firefox, Safari, etc.)
• `get_stats_by_client_type` - Statistics by email client type (desktop, mobile, webmail)
• `get_stats_by_device_type` - Statistics by device type (desktop, mobile, tablet)
• `get_stats_by_mailbox_provider` - Statistics by mailbox provider (Gmail, Outlook, Yahoo, etc.)
• `get_stats_by_country` - Statistics by country and state/province
• `get_category_stats` - Statistics for specific email categories (13-month history)
• `get_subuser_stats` - Statistics for specific subuser accounts

Tracks delivery, open, and click-through rates; bounce rates (hard/soft), spam reports, and unsubscribes; geographic performance and device preferences; email client compatibility and browser rendering; and provider-specific deliverability.

Examples

Example — global email statistics:

{
  "tool": "get_global_stats",
  "arguments": {
    "start_date": "2024-01-01",
    "end_date": "2024-01-31",
    "aggregated_by": "day"
  }
}

Example — statistics by mailbox provider:

{
  "tool": "get_stats_by_mailbox_provider",
  "arguments": {
    "start_date": "2024-01-01",
    "end_date": "2024-01-07",
    "aggregated_by": "day",
    "mailbox_providers": "gmail.com,outlook.com,yahoo.com"
  }
}

Example — geographic performance statistics:

{
  "tool": "get_stats_by_country",
  "arguments": {
    "start_date": "2024-01-01",
    "end_date": "2024-01-31",
    "country": "US",
    "aggregated_by": "week"
  }
}

Example — comprehensive statistics overview:

{
  "tool": "get_stats_overview",
  "arguments": {
    "start_date": "2024-01-01",
    "end_date": "2024-01-07",
    "aggregated_by": "day",
    "include_subusers": false
  }
}

Utilities

• `get_scopes` - Get available API permission scopes (no arguments)

Suppressions

• `list_suppression_groups` - List all unsubscribe (suppression) groups on the account
• `create_suppression_group` - Create a new unsubscribe (suppression) group
• `get_suppression_group` - Get details about a specific unsubscribe (suppression) group
• `update_suppression_group` - Update the name, description, or default status of an existing suppression group
• `delete_suppression_group` - Permanently delete an unsubscribe (suppression) group. This action cannot be undone.
• `list_group_suppressions` - List all email addresses that are unsubscribed from a specific suppression group
• `add_group_suppressions` - Add one or more email addresses to a specific suppression group's unsubscribe list
• `remove_group_suppression` - Remove a single email address from a specific suppression group's unsubscribe list. This only re-permits mail assigned to this group's category -- it is not a global resubscribe.
• `list_global_suppressions` - List email addresses on the account-wide global unsubscribe list, optionally filtered by a time range
• `add_global_suppression` - Add recipients to the account-wide global unsubscribe list -- they will stop receiving all non-transactional mail from this account
• `get_global_suppression` - Check whether a specific email address is on the account-wide global unsubscribe list
• `delete_global_suppression` - Remove an email address from the account-wide global suppression list, effectively resubscribing them to non-transactional mail
• `list_bounces` - List all email addresses that have bounced, optionally filtered by a time range
• `get_bounce` - Get bounce event(s) recorded for a specific email address
• `delete_bounce` - Remove a bounce record for an email address so this address can receive mail again
• `list_blocks` - List all email addresses currently on the blocks list, optionally filtered by a time range
• `delete_block` - Remove an email address from the blocks list so this address can receive mail again
• `list_spam_reports` - List all email addresses that have reported mail as spam, optionally filtered by a time range
• `delete_spam_report` - Remove an email address from the spam reports list so this address can receive mail again
• `list_invalid_emails` - List all email addresses that have been marked invalid, optionally filtered by a time range
• `delete_invalid_email` - Remove an email address from the invalid emails list so this address can receive mail again

Domain Authentication & Link Branding

• `list_authenticated_domains` - List all authenticated (whitelabel) domains configured for sending mail
• `get_authenticated_domain` - Get detailed information about a specific authenticated domain, including its DNS records
• `create_authenticated_domain` - Set up domain authentication (SPF/DKIM) for sending mail from a custom domain
• `update_authenticated_domain` - Update the custom SPF or default settings of an existing authenticated domain
• `delete_authenticated_domain` - Permanently delete an authenticated domain. This action cannot be undone.
• `validate_authenticated_domain` - Check whether the domain's DNS records are correctly configured for authentication
• `get_default_authenticated_domain` - Get the authenticated domain currently set as the default for sending mail
• `list_branded_links` - List all branded links (link whitelabels) configured for click tracking
• `get_branded_link` - Get detailed information about a specific branded link, including its DNS records
• `create_branded_link` - Set up branded link tracking (click tracking through the sender's own domain instead of sendgrid.net)
• `update_branded_link` - Update the default setting of an existing branded link
• `delete_branded_link` - Permanently delete a branded link. This action cannot be undone.
• `validate_branded_link` - Check whether the branded link's DNS records are correctly configured

Event & Inbound Parse Webhooks

• `list_event_webhooks` - List all configured Event Webhook settings on the account
• `get_event_webhook` - Get the configuration of a specific Event Webhook by ID
• `create_event_webhook` - Creates a new Event Webhook that POSTs email events (delivered, bounced, opened, clicked, etc.) to the given URL
• `update_event_webhook` - Update the configuration of an existing Event Webhook
• `delete_event_webhook` - Permanently delete an Event Webhook configuration. This action cannot be undone.
• `test_event_webhook` - Sends a test event payload to the given webhook URL to verify it's reachable and correctly configured
• `list_inbound_parse_settings` - List all configured Inbound Parse webhook settings on the account
• `get_inbound_parse_setting` - Get the Inbound Parse webhook configuration for a specific hostname
• `create_inbound_parse_setting` - Configures inbound email parsing so mail sent to the given hostname is POSTed to the given URL
• `update_inbound_parse_setting` - Update the Inbound Parse webhook configuration for a specific hostname
• `delete_inbound_parse_setting` - Permanently delete an Inbound Parse webhook configuration for a hostname. This action cannot be undone.
• `get_inbound_parse_stats` - Get statistics on the number of inbound emails parsed over a given date range

Tracking Settings

• `get_tracking_settings` - Retrieve all tracking settings (click, open, subscription, Google Analytics) in one call
• `get_click_tracking_settings` - Retrieve the current click tracking setting
• `update_click_tracking_settings` - Enable or disable click tracking on links within emails
• `get_google_analytics_settings` - Retrieve the current Google Analytics tracking settings
• `update_google_analytics_settings` - Update Google Analytics tracking settings, including UTM campaign, content, medium, source, and term values
• `get_open_tracking_settings` - Retrieve the current open tracking setting
• `update_open_tracking_settings` - Enable or disable open tracking, which inserts an invisible pixel to record when an email is opened
• `get_subscription_tracking_settings` - Retrieve the current subscription tracking settings
• `update_subscription_tracking_settings` - Update subscription tracking settings, including the unsubscribe link content, landing page, URL, and replacement tag

Mail Settings

• `get_all_mail_settings` - Retrieve all mail settings (address whitelist, bounce purge, footer, forward bounce, forward spam, etc.) in one call
• `get_address_whitelist_settings` - Retrieve the current address whitelist mail setting, which controls which email addresses or domains bypass all suppression lists
• `update_address_whitelist_settings` - Update the address whitelist setting that controls which email addresses or domains bypass all suppression lists
• `get_bounce_purge_settings` - Retrieve the current bounce purge mail setting, which automatically purges old bounce records after a configured number of days
• `update_bounce_purge_settings` - Update the bounce purge setting that automatically purges old bounce records after a configured number of days
• `get_footer_settings` - Retrieve the current footer mail setting, which appends a footer to every outgoing email
• `update_footer_settings` - Update the footer setting that appends a footer to every outgoing email
• `get_forward_bounce_settings` - Retrieve the current forward bounce mail setting, which forwards bounce notifications to a given email address
• `update_forward_bounce_settings` - Update the forward bounce setting that forwards bounce notifications to a given email address
• `get_forward_spam_settings` - Retrieve the current forward spam mail setting, which forwards spam report notifications to a given email address
• `update_forward_spam_settings` - Update the forward spam setting that forwards spam report notifications to a given email address

API Keys (read-only)

• `list_api_keys` - List all API keys on the account (names and IDs only, not the secret key values)
• `get_api_key` - Get details for a specific API key, including its scopes

Alerts (read-only)

• `list_alerts` - List all usage/stats alerts configured on the account
• `get_alert` - Get details for a specific alert

Teammates (read-only)

• `list_teammates` - List all teammates (users) on the account
• `get_teammate` - Get details for a specific teammate, including their permission scopes
• `list_pending_teammates` - List pending teammate invitations that haven't been accepted yet

Dedicated IPs (read-only)

• `list_ip_addresses` - List all IP addresses assigned to the account
• `get_ip_address` - Get details for a specific IP address, including its warmup status and assigned subusers
• `list_assigned_ips` - List all IP addresses that are currently assigned to a subuser
• `list_ip_pools` - List all IP pools on the account
• `get_ip_pool` - Get details for a specific IP pool, including the IP addresses it contains
• `get_remaining_ips` - Get the count and cost of additional dedicated IP addresses available for purchase
• `list_ip_warmups` - List all IP addresses currently in the warmup process
• `get_ip_warmup_status` - Get the warmup status for a specific IP address
• `list_allowed_ips` - List IP addresses allowed to access the account via the API/UI (the access allowlist)
• `get_allowed_ip` - Get details for a specific entry in the access allowlist
• `list_access_activity` - List recent account access attempts (successful and blocked logins/API calls)

Design Library

• `list_designs` - List all custom email designs in the Design Library
• `create_design` - Create a new custom email design in the Design Library from raw HTML
• `get_design` - Get details for a specific design in the Design Library
• `update_design` - Update the content or metadata of an existing design in the Design Library
• `delete_design` - Permanently delete a custom design from the Design Library. This action cannot be undone.
• `duplicate_design` - Create a copy of an existing design in the Design Library
• `list_prebuilt_designs` - List SendGrid's built-in pre-made design templates
• `get_prebuilt_design` - Get details for one of SendGrid's built-in pre-made designs
• `duplicate_prebuilt_design` - Create an editable copy of one of SendGrid's built-in pre-made designs

Email Address Validation

• `validate_email` - Check whether an email address is valid and likely to be deliverable, using SendGrid's Email Address Validation API (consumes a billed validation credit per call)

Message Search

• `search_email_activity` - Search sent message activity using SendGrid's SGQL filter syntax (e.g. by recipient, status, or subject) -- useful for troubleshooting why a specific email wasn't delivered
• `get_message_details` - Get full delivery event history and details for a single sent message by its message ID

Available Resources

• `sendgrid://automations` - Marketing automations data
• `sendgrid://singlesends` - Single send campaigns data
• `sendgrid://lists` - Email lists data
• `sendgrid://contacts` - Contact segments data
• `sendgrid://suppressions` - Suppression lists (bounces, spam, etc.)
• `sendgrid://account` - Account profile information
• `sendgrid://stats` - Global email statistics and performance metrics (30-day overview)
• `sendgrid://stats/browsers` - Email statistics by browser type (7-day data)
• `sendgrid://stats/devices` - Email statistics by device type (7-day data)
• `sendgrid://stats/geography` - Email statistics by geographic location (7-day data)
• `sendgrid://stats/providers` - Email statistics by mailbox provider (7-day data)

Available Prompts

• `sendgrid_automation_help` - Get help with marketing automations
• `sendgrid_campaign_help` - Get help with single send campaigns
• `sendgrid_contacts_help` - Get help with comprehensive contact management
• `sendgrid_list_management_help` - Get help with email list CRUD operations
• `sendgrid_update_list_help` - Get help with updating/renaming email lists
• `sendgrid_contact_crud_help` - Get help with contact create/read/update/delete operations
• `sendgrid_custom_fields_help` - Get help with custom field definitions management
• `sendgrid_segment_management_help` - Get help with managing dynamic contact segments
• `sendgrid_sender_management_help` - Get help with sender identity management
• `sendgrid_templates_help` - Get help with creating and managing dynamic email templates
• `sendgrid_suppressions_help` - Get help with suppression lists
• `sendgrid_settings_help` - Get help with account settings
• `sendgrid_mail_send_help` - Get help with sending emails
• `sendgrid_stats_help` - Get help with analyzing email performance and statistics

Development & Contributing

This section is for developers who want to modify the server or contribute to development.

Development setup, project structure, and contribution guide

Prerequisites

• Node.js 20+ and npm
• SendGrid account with API key
• Git

Development Setup

# Clone the repository
git clone https://github.com/deyikong/sendgrid-mcp.git
cd sendgrid-mcp

# Install dependencies
npm install

# Build the project
npm run build

# Link for local development
npm link

# Test the local build
sendgrid-mcp

Using a local build in an MCP client (instead of the npm-installed binary):

{
  "mcpServers": {
    "sendgrid": {
      "command": "node",
      "args": ["/absolute/path/to/sendgrid-mcp/build/index.js"],
      "env": {
        "SENDGRID_API_KEY": "SG.your_api_key_here",
        "READ_ONLY": "true"
      }
    }
  }
}

Project Structure

src/
├── index.ts                    # Main entry point
├── shared/                     # Shared utilities
│   ├── auth.ts                 # Authentication
│   ├── api.ts                  # SendGrid API client
│   ├── env.ts                  # Environment validation
│   └── types.ts                # Shared types
├── tools/                      # Tool definitions
│   ├── automations.ts          # Automation tools (7 tools)
│   ├── campaigns.ts            # Campaign tools (4 tools)
│   ├── contacts.ts             # Contact, list, segment & sender tools (25 tools)
│   ├── mail.ts                 # Mail sending tools (1 tool)
│   ├── misc.ts                 # Miscellaneous tools (1 tool)
│   ├── stats.ts                # Statistics tools (9 tools)
│   └── templates.ts            # Template tools (11 tools)
├── resources/                  # Resource definitions
│   └── sendgrid.ts             # MCP resources
└── prompts/                    # Prompt definitions
    └── help.ts                 # Help prompts

Adding New Tools

1. Add tool definition to appropriate file in `src/tools/`

2. Follow the existing pattern with config and handler

3. Export from `src/tools/index.ts`

4. Update README.md with new tool documentation

5. Run `npm run build` to compile

Available Scripts

• `npm run build` - Compile TypeScript to JavaScript
• `npm start` - Run the compiled server
• `npm test` - Build and run the test suite

Testing Your Changes

# Build the project
npm run build

# Test with environment variables
SENDGRID_API_KEY="SG.your_key" READ_ONLY="true" node build/index.js

For manually verifying a real client can connect over each HTTP auth mode

(token, none, TLS, OAuth) rather than just the automated suite, see

TESTING.md.

Creating a Release

For maintainers only:

1. Update version in `package.json`:

npm version patch  # or minor, major

2. Push changes and tags:

git push && git push --tags

3. Create GitHub release - this triggers automatic npm publishing via GitHub Actions

Publishing Process

• Automated: GitHub Actions publishes to npm on release creation
• Provenance: All packages include provenance attestation for security
• Versioning: Follows semantic versioning (semver)
• Package: `sendgrid-mcp` on npm — update with `npm update -g sendgrid-mcp`

Troubleshooting

Common Issues

6 common issues & fixes

1. Server Not Found / Command Not Found

Error: sendgrid-mcp: command not found

Solution:

• Ensure you installed globally: `npm install -g sendgrid-mcp`
• Check npm global bin directory is in PATH: `npm config get prefix`
• Try reinstalling: `npm uninstall -g sendgrid-mcp && npm install -g sendgrid-mcp`

2. Invalid API Key

Error: SENDGRID_API_KEY must start with 'SG.'

Solution:

• Ensure your API key starts with `SG.`
• Verify you copied the complete key from SendGrid
• Check for extra spaces or quotes in your configuration
• Generate a new API key at SendGrid API Keys

3. Permission Errors

Error: 403 Forbidden

Solution:

• Your API key may not have sufficient permissions
• Create a new key with "Full Access" or required scopes
• Verify the key hasn't been revoked or expired

4. Read-Only Mode Blocking Operations

❌ Operation blocked: Server is running in READ_ONLY mode

Solution:

• This is intentional security protection
• To enable write operations, set `READ_ONLY: "false"` in your MCP client configuration
• Example:

{
    "env": {
      "SENDGRID_API_KEY": "SG.your_key",
      "READ_ONLY": "false"
    }
  }

5. MCP Client Not Detecting Server

Solution:

• Verify the configuration file location for your specific client
• Ensure JSON syntax is valid (no trailing commas, proper quotes)
• Restart your MCP client after configuration changes
• Check client logs for specific error messages

6. Connection Timeout

Error: Request timeout

Solution:

• Check your internet connection
• Increase timeout in configuration:

{
    "env": {
      "REQUEST_TIMEOUT": "60000"
    }
  }

• Verify SendGrid API is accessible (not blocked by firewall/proxy)

Getting Help

• Built-in Help: Use help prompts in your MCP client (e.g., ask Claude: "help with sendgrid automations")
• SendGrid API: Official API Documentation
• MCP Protocol: Model Context Protocol Docs
• Issues: Report bugs at the GitHub repository

Debug Mode

Enable detailed logging by setting the LOG_LEVEL:

{
  "env": {
    "SENDGRID_API_KEY": "SG.your_key",
    "LOG_LEVEL": "debug"
  }
}

This will provide detailed information about API requests and responses.

Security

Found a vulnerability? Please report it privately rather than opening a

public issue — see SECURITY.md.

Intentionally Unsupported Operations

A handful of SendGrid API capabilities are deliberately left out of this server, on top of whatever `READ_ONLY` mode blocks at runtime. These aren't gaps to be filled later — they're excluded because letting an LLM call them autonomously carries account-wide blast radius that a `READ_ONLY` toggle alone doesn't mitigate (an operator running with `READ_ONLY=false` for legitimate marketing-automation writes shouldn't also be one prompt-injected tool call away from losing account access or api budget):

• API key creation/rotation/deletion — only `list_api_keys`/`get_api_key` are exposed. Minting or deleting API keys is a classic prompt-injection target: a malicious webpage or email an agent processes could try to trick it into creating a new key and exfiltrating it.
• Teammate invites, permission changes, and removal — only `list_teammates`/`get_teammate`/`list_pending_teammates` are exposed. Adding, removing, or re-permissioning teammates is account access control with the same injection risk as API keys.
• Dedicated IP purchases, warmup control, and access-allowlist changes — only read/list tools are exposed. Dedicated IPs cost real money and affect deliverability infrastructure account-wide; access-allowlist mistakes can lock out legitimate API access entirely.
• SSO and certificate management — not exposed at all, in any form. Misconfiguring SSO can lock an entire organization out of login, and there's essentially no legitimate reason for a chat assistant to be managing it.

If you need any of these for a specific automation, use the SendGrid dashboard or API directly rather than requesting this server add them — that's a deliberate design boundary, not an oversight.

License

This project is licensed under the ISC License.

Contributing

1. Fork the repository

2. Create a feature branch

3. Make your changes

4. Test thoroughly

5. Submit a pull request

Support

For issues related to:

• SendGrid API: Check SendGrid Documentation
• MCP Protocol: Check Model Context Protocol
• This Server: Open an issue in this repository

Feedback

I work at SendGrid and maintain this project. Feedback, bug reports, and feature requests are always welcome — please open an issue or start a discussion on the repository.