convert.currency
Convert an amount between currencies at a live or historical exchange rate. Pass from + to (3-letter ISO 4217) + optional amount (default 1) + date (YYYY-MM-DD for historical; omit for latest). Returns the converted result, per-unit rate, and effective rate date. Live ECB reference rates (via Fra...
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What convert.currency does on Mcp
AI agents call convert.currency to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why convert.currency is rated Low
This is a pure data retrieval tool that queries live or historical exchange rates and performs mathematical conversion calculations. While the parent server facilitates financial transactions (pay-per-call via USDC), this specific tool does not move money, create financial obligations, or execute transactions. It is a read-only utility for currency conversion lookup.
From the tool's definition Tool description states it 'Convert[s] an amount between currencies at a live or historical exchange rate' and 'Returns the converted result, per-unit rate, and effective rate date.' The verb 'returns' and 'fetches per request' indicate data retrieval only.
Attacks that exploit this kind of access
The rule that runs convert.currency safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For convert.currency, this is the rule to start with:
convert.currency is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp, apply this rule, and every convert.currency call is checked against it from then on.
Questions about convert.currency
Convert an amount between currencies at a live or historical exchange rate. Pass from + to (3-letter ISO 4217) + optional amount (default 1) + date (YYYY-MM-DD for historical; omit for latest). Returns the converted result, per-unit rate, and effective rate date. Live ECB reference rates (via Frankfurter), fetched per request — never stale; weekends/holidays use the last business day. ECB major currencies. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for convert.currency: 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 Mcp. Nothing to install.
convert.currency 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 convert.currency 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 convert.currency. 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.
convert.currency is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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