Provides the list of available currencies from frankfurter dev API as of today
AI agents call available_currencies to retrieve information from FX Currency 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 static metadata (a list of supported currencies) from the Frankfurter API. It performs no modifications, deletions, code execution, or financial transactions. The blast radius of misuse is minimal — an agent could only query the list redundantly or spam the endpoint, neither of which causes meaningful harm.
From the tool's definition Tool 'available_currencies' 'Provides the list of available currencies' — a straightforward data retrieval operation with no side effects.
Attacks that exploit this kind of access
Provides the list of available currencies from frankfurter dev API as of today. It is categorised as a Read tool in the FX Currency MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FX Currency MCP Server MCP server in PolicyLayer and add a rule for available_currencies: 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 FX Currency MCP Server. Nothing to install.
available_currencies 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 available_currencies 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 available_currencies. 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.
available_currencies is provided by the FX Currency MCP Server MCP server (pavm035/ai-fx-currency-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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