AI agents use redeem_vouchers to commit financial operations through Zbd — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Redeeming a voucher is a financial operation that claims monetary value. Given the context of a ZBD server (a Bitcoin/Lightning Network payments platform) and sibling tools like create_charge, create_withdrawal_requests, and create_vouchers, this tool irreversibly consumes a voucher and triggers a financial transfer, placing it firmly in the Financial category with high severity.
From the tool's definition 'Redeem Voucher' - redeeming a voucher commits a financial transaction by converting a voucher code into monetary value or credits
Attacks that exploit this kind of access
Redeem Voucher. It is categorised as a Financial tool in the Zbd MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Zbd MCP server in PolicyLayer and add a rule for redeem_vouchers: 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 Zbd. Nothing to install.
redeem_vouchers 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 redeem_vouchers 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 redeem_vouchers. 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.
redeem_vouchers is provided by the Zbd MCP server (zebedeeio/zbd-payments-typescript-sdk). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
redeem_vouchers is one line of Zbd's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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