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OneSignal
OneSignal is a customer engagement platform that lets you send targeted push notifications, emails, SMS, and in-app messages, manage audiences, and track campaign performance. With the OneSignal MCP, manage your messaging directly from your AI assistant. Send push notifications, emails, and SMS by simply describing your audience and message. Check campaign delivery stats, build audience segments, manage templates, and handle user subscriptions all through conversation.
Follow the source guide for connection and authentication details.
Available tools
create_alias_by_subscription
Create or update identity aliases for the user who owns a given subscription. The `onesignal_id` alias is read-only and must not be included.
create_custom_events
Record custom events for OneSignal users, such as purchases, content views, or milestones. Use these to enter users into Journeys or trigger Wait Until nodes. Each event must set at least one of `external_id` or `onesignal_id`.
create_or_update_alias
Create or update identity aliases for a user identified by alias. The `onesignal_id` alias is read-only and must not be included.
create_segment
Create a new audience segment with filter conditions. Maximum 200 filter entries.
create_subscription
Create a new subscription and attach it to a user. Set `type` to the channel ("Email", "SMS", "iOSPush", "AndroidPush", etc.) and `token` to the email address, E.164 phone number, or push token.
create_template
Create a new notification template for a OneSignal app.
create_user
Create a new user in a OneSignal app. Provide an `identity` (e.g. {"external_id": "user-123"}) so the user can be referenced later by alias. Optionally attach `properties` (tags, language, country) and `subscriptions` (email, SMS, or push channels). The `identity` field is required to prevent orphaned users.
export_audience_activity_csv
Export audience activity for a notification to CSV. WARNING: Only 1 concurrent export is allowed per account — if a 409 or 429 is returned, a previous export is still running.
export_subscriptions_csv
Export all subscriptions for a OneSignal app to CSV. WARNING: Only 1 concurrent export is allowed per account — if a 409 or 429 is returned, a previous export is still running.
get_custom_events
List the custom event definitions indexed for a OneSignal app, including each event's properties, sources, most recent occurrence, usage locations (segment/journey), storage and total counts, and retention duration. Requires OAuth authentication.
get_segment
Retrieve a single audience segment by ID. By default, includes full segment metadata and filters (`payload` object with `id`, `name`, `created_at`, `source`, and `filters`). Set `include_segment_detail` to `false` to return only the subscriber count. Note: the API returns 400 for user-based segments (those using custom_event or message_event filters).
get_template
Retrieve a single notification template by ID.