Critical-risk tools in OneSignal MCP Server
10 of the 61 tools in OneSignal MCP Server are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.
Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.
Tools at critical risk
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cancel_messageDestructiveCancel a scheduled message.
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delete_aliasDestructiveDelete a user alias.
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delete_app_api_keyDestructiveDelete an API key from a specific OneSignal app.
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delete_playerDestructiveDelete a player/device record (legacy API).
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delete_segmentDestructiveDelete a segment from your OneSignal app.
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delete_subscriptionDestructiveDelete a user's subscription.
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delete_templateDestructiveDelete a template.
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delete_userDestructiveDelete a user and all their subscriptions.
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remove_appDestructiveRemove a local OneSignal app configuration.
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transfer_subscriptionFinancialTransfer a subscription from one user to another.
Attacks that target this class
Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.