trycourier/courier-mcp

The official Model Context Protocol (MCP) server for the Courier notification API. It gives AI agents full access to the Courier API — send messages, manage profiles, debug deliveries, configure lists, and more — through 60 tools backed by the @trycourier/courier Node SDK.

Install

Hosted (recommended)

Courier runs a hosted MCP server at https://mcp.courier.com. No local setup required.

Cursor — add to .cursor/mcp.json:

{
  "mcpServers": {
    "Courier": {
      "url": "https://mcp.courier.com",
      "headers": {
        "api_key": "YOUR_COURIER_API_KEY"
      }
    }
  }
}

Claude Code:

claude mcp add Courier --transport http --url https://mcp.courier.com --header "api_key: YOUR_COURIER_API_KEY"

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "Courier": {
      "url": "https://mcp.courier.com",
      "headers": {
        "api_key": "YOUR_COURIER_API_KEY"
      }
    }
  }
}

Local development

git clone https://github.com/trycourier/courier-mcp.git
cd courier-mcp
sh dev.sh

Then point your IDE at http://localhost:3000 with the same config format above.

Tools

59 default tools organized by API resource, plus 1 diagnostic tool available in local installs.

Default tools

Category	Tools
Send	send_message, send_message_template, send_message_to_list, send_message_to_list_template
Messages	list_messages, get_message, get_message_content, get_message_history, cancel_message
Profiles	get_user_profile_by_id, create_or_merge_user, replace_profile, delete_profile, get_user_list_subscriptions, subscribe_user_to_lists, delete_user_list_subscriptions
Lists	list_lists, get_list, get_list_subscribers, create_list, subscribe_user_to_list, unsubscribe_user_from_list
Audiences	get_audience, list_audience_members, list_audiences, update_audience, delete_audience
Notifications	list_notifications, get_notification_content, get_notification_draft_content
Brands	create_brand, get_brand, list_brands
Auth	generate_jwt_for_user
User Tokens	list_user_push_tokens, get_user_push_token, create_or_replace_user_push_token
Docs	courier_installation_guide
Automations	invoke_automation_template, invoke_ad_hoc_automation
Bulk	create_bulk_job, add_bulk_users, run_bulk_job, get_bulk_job, list_bulk_users
Audit Events	get_audit_event, list_audit_events
Inbound	track_inbound_event
Tenants	get_tenant, create_or_update_tenant, list_tenants, delete_tenant
Users	get_user_preferences, update_user_preference_topic, list_user_tenants, add_user_to_tenant, remove_user_from_tenant
Translations	get_translation, update_translation

Diagnostic tools (local only)

Category	Tools
Config	get_environment_config — check which API key, base URL, and package version the MCP session is using

Architecture

courier-mcp/
├── mcp/                    # MCP package (@trycourier/courier-mcp on npm)
│   └── src/
│       ├── index.ts        # CourierMcp server class
│       ├── tools/          # Tool definitions (one file per API resource)
│       └── utils/          # Config, error handling, registry
├── server/                 # Express server (hosts the MCP package via HTTP)
│   └── src/index.ts        # Stateless HTTP handler
└── dev.sh                  # Local development launcher

The MCP package uses the official @trycourier/courier Node SDK (Stainless-generated) for all API calls. The SDK stays in sync with the Courier API spec automatically, so tool implementations are thin wrappers with proper error handling.

Configuration

Header	Required	Description
api_key	Yes	Your Courier API key. Get one at app.courier.com/settings/api-keys.
base_url	No	Override the API base URL. Defaults to https://api.courier.com.

Development

# Install dependencies
cd mcp && npm install && cd ../server && npm install && cd ..

# Start development server
sh dev.sh

# Run tests
cd mcp && npm test

# Build
cd mcp && npm run build

SDK dependency updates

The @trycourier/courier SDK dependency in mcp/ is updated automatically via Dependabot. Dependabot checks npm daily and opens a PR when a new SDK version is available.

• Patch/minor bumps: review CI status, then merge.
• Major bumps (labeled breaking-review): check whether any tool input schemas or error handling need updates before merging.

After merging a Dependabot PR, the full pipeline runs automatically:

1. auto-version-bump.yml bumps the MCP package patch version and pushes to main.
2. publish-npm.yml publishes the new version to npm.
3. bump-services.yml opens a PR in trycourier/services to update the hosted MCP server.

Secrets required (set in repo Settings > Secrets and variables > Actions):

• REPO_TOKEN — PAT with Contents: Read and write on this repo. Used by auto-version-bump.yml to push to main and trigger downstream workflows.
• SERVICES_REPO_TOKEN — PAT with Contents: Read and write + Pull requests: Read and write on trycourier/services. Used by bump-services.yml to open dependency bump PRs.
• NPM_TOKEN — npm publish token. Used by publish-npm.yml.

Links

• Courier docs
• MCP documentation page
• AI developer tools overview
• Courier Node SDK
• MCP protocol spec