Search for available flights between two airports. Returns a list of offers with pricing and itinerary details.
AI agents call search_flights to retrieve information from Duffel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and retrieves flight data from the Duffel API. It performs a search query that returns offers and pricing information. There are no side effects, no data modification, no code execution, and no financial transactions initiated by the search itself—it only presents available flight options for user consideration.
From the tool's definition The tool description states it 'Search for available flights between two airports. Returns a list of offers with pricing and itinerary details.' This is purely a query operation that retrieves information without modifying, deleting, or executing external…
Attacks that exploit this kind of access
Search for available flights between two airports. Returns a list of offers with pricing and itinerary details. It is categorised as a Read tool in the Duffel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Duffel MCP Server MCP server in PolicyLayer and add a rule for search_flights: 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 Duffel MCP Server. Nothing to install.
search_flights 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 search_flights 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 search_flights. 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.
search_flights is provided by the Duffel MCP Server MCP server (naren8642/duffel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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