// SCAN REPORT

OneSignal MCP Server

61 tools. 44 can modify or destroy data without limits.

10 destructive tools with no built-in limits. Policy required.

Last updated: 29 Jun 2026

44 can modify or destroy data

17 read-only

61 tools total

Community server · catalogue entry verified 29/06/2026

How to control OneSignal MCP Server ↓

TOOL MAP

What OneSignal MCP Server exposes to your agents

Read (17) Write / Execute (34) Destructive / Financial (10)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

Critical Risk

The most dangerous OneSignal MCP Server tools

Financial · High transfer_subscription Transfer a subscription from one user to another. Destructive · High cancel_message Cancel a scheduled message. Destructive · High delete_alias Delete a user alias. Destructive · High delete_app_api_key Delete an API key from a specific OneSignal app.

44 of OneSignal MCP Server's 61 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control OneSignal MCP Server

PolicyLayer is an MCP gateway — it sits between your AI agents and OneSignal MCP Server, and nothing reaches the server without passing your rules. These are the rules we recommend:

Block financial tools by default

{
  "transfer_subscription": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Requires human approval."
      }
    ]
  }
}

Financial tools should be explicitly enabled per use case, not open by default.

Deny destructive operations

{
  "cancel_message": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Blocked by default. Requires approval."
      }
    ]
  }
}

Destructive tools should never be available to autonomous agents without human approval.

Rate limit write operations

{
  "add_app": {
    "limits": [
      {
        "counter": "add_app_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "list_apps": {
    "limits": [
      {
        "counter": "list_apps_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register OneSignal MCP Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON ONESIGNAL →

Instant setup, no code required.

FULL CATALOGUE

All 61 OneSignal MCP Server tools

FINANCIAL 1 tools

Financial transfer_subscription Transfer a subscription from one user to another.

DESTRUCTIVE 9 tools

Destructive cancel_message Cancel a scheduled message. Destructive delete_alias Delete a user alias. Destructive delete_app_api_key Delete an API key from a specific OneSignal app. Destructive delete_player Delete a player/device record (legacy API). Destructive delete_segment Delete a segment from your OneSignal app. Destructive delete_subscription Delete a user's subscription. Destructive delete_template Delete a template. Destructive delete_user Delete a user and all their subscriptions. Destructive remove_app Remove a local OneSignal app configuration.

EXECUTE 1 tools

Execute start_live_activity Start a new iOS Live Activity.

WRITE 33 tools

Write add_app Add a new OneSignal app configuration locally. Write add_player add_player Write copy_template_to_app Copy a template to another app. Write create_alias_by_subscription Create or update a user alias by subscription ID. Write create_app Create a new OneSignal application at the organization level (requires Organization API Key). Write create_app_api_key Create a new API key for a specific OneSignal app (requires Organization API Key). Write create_or_update_alias Create or update a user alias. Write create_segment Create a new segment in your OneSignal app. Write create_subscription Create a new subscription for a user. Write create_template Create a new template. Write create_user Create a new user in OneSignal. Write edit_player edit_player Write edit_tags_with_external_user_id Edit tags for a user by external user ID (legacy API). Write end_live_activity End an iOS Live Activity. Write export_audience_activity_csv Export audience activity to CSV (requires Organization API Key). Write export_messages_csv Export messages to CSV (requires Organization API Key). Write export_players_csv Export player data to CSV (requires Organization API Key). Write export_subscriptions_csv Export subscriptions/players data to CSV (requires Organization API Key). Write rotate_app_api_key Rotate an API key (generate new token while keeping permissions). Write send_email Send an email through OneSignal. Write send_push_notification Send a push notification through OneSignal. Write send_sms Send an SMS/MMS through OneSignal. Write send_transactional_message Send a transactional message (immediate delivery). Write switch_app Switch the current app to use for API requests. Write unsubscribe_email Unsubscribe an email subscription using an unsubscribe token. Write update_app Update an existing OneSignal application at the organization level (requires Organization API Key). Write update_app_api_key Update an API key for a specific OneSignal app. Write update_live_activity Update an iOS Live Activity. Write update_local_app_config Update an existing local OneSignal app configuration. Write update_subscription Update a user's subscription. Write update_subscription_by_token Update a subscription by subscription token. Write update_template Update an existing template. Write update_user Update an existing user's information.

READ 17 tools

Read list_apps List all configured OneSignal apps. Read view_app_api_keys View API keys for a specific OneSignal app (requires Organization API Key). Read view_app_details Get detailed information about the configured OneSignal app. Read view_apps List all OneSignal applications for the organization (requires Organization API Key). Read view_message_details Get detailed information about a specific message. Read view_message_history View the history / recipients of a message based on events. Read view_messages View recent messages sent through OneSignal. Read view_outcomes View outcomes data for your app. Read view_player_details Get detailed information about a specific player/device (legacy API). Read view_players View players/devices subscribed to your OneSignal app (legacy API). Read view_segments List all segments available in your OneSignal app. Read view_subscription_by_token View subscription details by subscription token. Read view_template_details Get template details. Read view_templates List all templates. Read view_user Get detailed information about a specific user. Read view_user_identity Get user identity information. Read view_user_identity_by_subscription View user identity information by subscription ID.

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about OneSignal MCP Server

Can an AI agent move money through the OneSignal MCP Server MCP server? +

Yes. The OneSignal MCP Server server exposes 1 financial tools including transfer_subscription. Without a policy, an autonomous agent can call these with no spend caps, no rate limits, and no approval flow. PolicyLayer lets you block financial tools by default, require human approval, or set per-tool rate limits — enforced on every call.

Can an AI agent delete data through the OneSignal MCP Server MCP server? +

Yes. The OneSignal MCP Server server exposes 9 destructive tools including cancel_message, delete_alias, delete_app_api_key. These permanently remove resources with no undo. PolicyLayer blocks destructive tools by default so they never reach the upstream server.

How do I prevent bulk modifications through OneSignal MCP Server? +

The OneSignal MCP Server server has 33 write tools including add_app, add_player, copy_template_to_app. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach OneSignal MCP Server.

How many tools does the OneSignal MCP Server MCP server expose? +

61 tools across 5 categories: Destructive, Execute, Financial, Read, Write. 17 are read-only. 44 can modify, create, or delete data.

How do I enforce a policy on OneSignal MCP Server? +

Register the OneSignal MCP Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every OneSignal MCP Server tool call.

Deterministic rules across all 61 OneSignal MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON ONESIGNAL →

Instant setup, no code required.

61 OneSignal MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.