// MCP TOOL REFERENCE

transfer_subscription

Transfer a subscription to a different user within the same app. Cross-app transfers are not supported. Rate limited to 1 request per second per subscription.

Part of the OneSignal MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

onesignal/onesignal Financial

// WHEN AI AGENTS USE THIS TOOL

AI agents use transfer_subscription to initiate financial transactions through OneSignal. Financial operations involve real money and are irreversible once processed. Intercept blocks financial tools by default, requiring explicit human approval with transaction-level limits to prevent unauthorised spending.

// WHY ENFORCE A POLICY ON TRANSFER_SUBSCRIPTION

transfer_subscription moves real money. Without a policy, an autonomous agent could initiate transactions that drain accounts or exceed budgets. Intercept blocks financial tools by default, requiring human-in-the-loop approval with configurable spending limits per transaction and per time window.

// RECOMMENDED POLICY

Financial tools involve real money. Block by default and require explicit human approval before enabling.

onesignal-onesignal.yaml

tools:
  transfer_subscription:
    rules:
      - action: deny
        reason: "Requires human approval"

See the full OneSignal policy for all 31 tools.

// DETAILS

Tool Name transfer_subscription

Category Financial

MCP Server OneSignal MCP Server

Risk Level Critical

// MORE ONESIGNAL TOOLS

Execute start_live_activity Write create_alias_by_subscription Write create_or_update_alias Write create_segment Write create_subscription Write create_template Write create_user Write export_audience_activity_csv

View all 31 tools →

// WHAT CAN GO WRONG

Agents calling financial-class tools like transfer_subscription have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER FINANCIAL TOOLS ACROSS MCP SERVERS

Other tools in the Financial risk category across the catalogue. The same policy patterns (deny, require_approval) apply to each.

Atv build_deposit_tx Atv build_queue_withdraw_tx Atv build_redeem_withdraw_tx Atv build_unqueue_withdraw_tx Atv build_withdraw_tx AbraFlexi bank_transaction_create

// IN CONTEXT OF CRITICAL RISK

transfer_subscription is one of the critical-risk operations in OneSignal. For the full severity-focused view — only the critical-risk tools with their recommended policies — see the breakdown for this server, or browse all critical-risk tools across every MCP server.

// RELATED READING

// FAQ

What does the transfer_subscription tool do? +

Transfer a subscription to a different user within the same app. Cross-app transfers are not supported. Rate limited to 1 request per second per subscription.. It is categorised as a Financial tool in the OneSignal MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on transfer_subscription? +

Add a rule in your Intercept YAML policy under the tools section for transfer_subscription. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the OneSignal MCP server.

What risk level is transfer_subscription? +

transfer_subscription is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit transfer_subscription? +

Yes. Add a rate_limit block to the transfer_subscription rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block transfer_subscription completely? +

Set action: deny in the Intercept policy for transfer_subscription. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides transfer_subscription? +

transfer_subscription is provided by the OneSignal MCP server (onesignal/onesignal). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

transfer_subscription

Let agents act without letting them run wild.