Create a new UniVoucher gift card using your standard Ethereum crypto wallet private key. The private key is optional and can be set via WALLET_PRIVATE_KEY environment variable (with or without 0x prefix). Uses Direct Response Mode for immediate card details.
AI agents use create_gift_card to commit financial operations through UniVoucher MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool creates crypto gift cards funded from a wallet, constituting a financial transaction that moves cryptocurrency. It also requires access to a private key, which represents a critical security risk — an AI agent misusing this tool could drain funds or create unauthorized financial obligations. Financial > all other categories.
From the tool's definition Create a new UniVoucher gift card...using your standard Ethereum crypto wallet private key
Attacks that exploit this kind of access
Create a new UniVoucher gift card using your standard Ethereum crypto wallet private key. The private key is optional and can be set via WALLET_PRIVATE_KEY environment variable (with or without 0x prefix). Uses Direct Response Mode for immediate card details. It is categorised as a Financial tool in the UniVoucher MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the UniVoucher MCP Server MCP server in PolicyLayer and add a rule for create_gift_card: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches UniVoucher MCP Server. Nothing to install.
create_gift_card is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the create_gift_card rule in your PolicyLayer 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.
Set action: deny in the PolicyLayer policy for create_gift_card. 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.
create_gift_card is provided by the UniVoucher MCP Server MCP server (univoucher/univoucher-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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