Check whether a discount/promo code is valid and what it offers.
AI agents call CHECK_DISCOUNT_PROMO to retrieve information from Travel Agent MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only validation and information retrieval operation on discount/promo codes. It checks validity and returns details about what a code offers, which is a data retrieval action with no side effects, state changes, or financial commitments. No money is moved, no bookings are created, and no data is deleted or modified.
From the tool's definition Tool name 'CHECK_DISCOUNT_PROMO' and description 'Check whether a discount/promo code is valid and what it offers' indicate a query/lookup operation that retrieves information about promo codes without modifying data.
Attacks that exploit this kind of access
Check whether a discount/promo code is valid and what it offers. It is categorised as a Read tool in the Travel Agent MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Travel Agent MCP Server MCP server in PolicyLayer and add a rule for CHECK_DISCOUNT_PROMO: 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 Travel Agent MCP Server. Nothing to install.
CHECK_DISCOUNT_PROMO 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 CHECK_DISCOUNT_PROMO 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 CHECK_DISCOUNT_PROMO. 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.
CHECK_DISCOUNT_PROMO is provided by the Travel Agent MCP Server MCP server (nxgnosis/travelagentmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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