AI agents call search_flights to retrieve information from LetsFG without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves flight price data without any side effects. The description clearly indicates it is read-only, meaning it only queries and returns information about available flights and pricing. There is no capability to book, modify, delete, or execute any operations. It is a simple data retrieval function, making it a Read category risk.
From the tool's definition Tool description explicitly states 'read-only' and the action is to 'search' for flight prices with no modification capability.
Attacks that exploit this kind of access
Search hundreds of airlines for live flight prices — completely FREE, unlimited, read-only.\n\n. It is categorised as a Read tool in the LetsFG MCP Server, which means it retrieves data without modifying state.
Register the LetsFG 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 LetsFG. 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 LetsFG MCP server (letsfg/letsfg). 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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