Show branded fare upgrade options (e.g. more baggage, flexible change) for a searched offer.
AI agents call GET_FLIGHT_FARE_UPSELL 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 retrieves and displays available upgrade options for a flight offer. It is a read-only query operation that presents information to the user without creating transactions, modifying records, or executing external actions. While the sibling server includes financial tools (BOOK_FLIGHT, CONFIRM_FLIGHT_PAYMENT), this specific tool only shows options and does not commit payments or reservations.
From the tool's definition Tool name is GET_FLIGHT_FARE_UPSELL and description states 'Show branded fare upgrade options' — a display/retrieval operation with no data modification, deletion, execution, or financial commitment.
Attacks that exploit this kind of access
Show branded fare upgrade options (e.g. more baggage, flexible change) for a searched offer. 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 GET_FLIGHT_FARE_UPSELL: 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.
GET_FLIGHT_FARE_UPSELL 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 GET_FLIGHT_FARE_UPSELL 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 GET_FLIGHT_FARE_UPSELL. 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.
GET_FLIGHT_FARE_UPSELL 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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