Get latest exchange rates from one base currency to multiple target currencies.
AI agents call base_quote to retrieve information from Frankfurter Forex MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries financial data (exchange rates) but performs no write, deletion, or financial transaction. It has no blast radius if misused by an AI agent—at worst, an agent retrieves incorrect rate information, which is a read-only consequence. The tool falls squarely in the Read category as it retrieves data without modification or execution of external operations.
From the tool's definition The tool retrieves latest exchange rates with no modification capability. Description states 'Get latest exchange rates' indicating a pure data retrieval operation with no side effects.
Attacks that exploit this kind of access
Get latest exchange rates from one base currency to multiple target currencies. It is categorised as a Read tool in the Frankfurter Forex MCP MCP Server, which means it retrieves data without modifying state.
Register the Frankfurter Forex MCP server in PolicyLayer and add a rule for base_quote: 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 Frankfurter Forex MCP. Nothing to install.
base_quote 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 base_quote 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 base_quote. 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.
base_quote is provided by the Frankfurter Forex MCP server (lcfranca/frankfurter-forex-mcp). 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.
Teams ship this data inside their own products. See what a licence covers →