Courier MCP Server

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

Safer defaults (optional client policies)

Tools that send live traffic, carry destructiveHint in MCP annotations, or mutate provider integrations are listed in code as RECOMMENDED_CLIENT_DISABLED_TOOLS (source). Export it from @trycourier/courier-mcp if you want to drive codegen or docs. Teams typically paste subsets into Claude Code (permissions.deny / mcp__<serverName>__<toolName>) or Codex ([mcp_servers.<name>.disabled_tools] in config.toml). This does not change hosted MCP behavior until each client applies its own policy.

Architecture

courier-mcp/
├── mcp/                    # MCP package (@trycourier/courier-mcp on npm)
│   └── src/
│       ├── index.ts        # CourierMcp server class
│       ├── policy/         # Optional client policy helpers (e.g. recommended disable list)
│       ├── 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