Query UniVoucher cards with various filters
AI agents call query_api_cards to retrieve information from UniVoucher MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or filters existing gift card data without creating, modifying, deleting, or executing transactions. It has no side effects and returns information only. Confidence is high because the description clearly indicates read-only querying behavior. Even in a financial context (crypto gift cards), the tool itself performs no financial operations—it only retrieves card information.
From the tool's definition Tool name 'query_api_cards' and description 'Query UniVoucher cards with various filters' indicate data retrieval without modification. The verb 'query' combined with 'filters' suggests searching/filtering existing card records.
Attacks that exploit this kind of access
Query UniVoucher cards with various filters. It is categorised as a Read tool in the UniVoucher MCP Server MCP Server, which means it retrieves data without modifying state.
Register the UniVoucher MCP Server MCP server in PolicyLayer and add a rule for query_api_cards: 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.
query_api_cards is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the query_api_cards 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 query_api_cards. 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.
query_api_cards 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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