Search direct flights by departure and arrival location plus date. Use depcity and arrcity when the user specifies cities such as BJS or SHA. Use dep and arr when the user specifies exact airports such as PEK or PVG. Provide one departure field and one arrival field, and do not mix city and airpo...
AI agents call searchFlightsByDepArr to retrieve information from Variflight without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though searchFlightsByDepArr only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
Search direct flights by departure and arrival location plus date. Use depcity and arrcity when the user specifies cities such as BJS or SHA. Use dep and arr when the user specifies exact airports such as PEK or PVG. Provide one departure field and one arrival field, and do not mix city and airport codes for the same side. All codes must be valid IATA 3-letter codes. Date must be in YYYY-MM-DD format. For today. It is categorised as a Read tool in the Variflight MCP Server, which means it retrieves data without modifying state.
Register the Variflight MCP server in PolicyLayer and add a rule for searchFlightsByDepArr: 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 Variflight. Nothing to install.
searchFlightsByDepArr 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 searchFlightsByDepArr 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 searchFlightsByDepArr. 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.
searchFlightsByDepArr is provided by the Variflight MCP server (@variflight-ai/variflight-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.