Search a flight by flight number and date. The flight number must include the airline code, for example MU2157 or CZ3969. dep and arr are optional and should only be provided when the exact airports are known. Date must be in YYYY-MM-DD format. For today
AI agents call searchFlightsByNumber 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 searchFlightsByNumber 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 a flight by flight number and date. The flight number must include the airline code, for example MU2157 or CZ3969. dep and arr are optional and should only be provided when the exact airports are known. 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 searchFlightsByNumber: 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.
searchFlightsByNumber 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 searchFlightsByNumber 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 searchFlightsByNumber. 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.
searchFlightsByNumber 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.