convert
Convert an amount from one currency to another at the current rate. Indicative developer-grade reference rates (aggregated market data + public reference rates), not for settlement or trading.
This record as markdown: /tools/dev-exchangerate-mcp/convert.md
What convert does on Exchangerate Dev
AI agents call convert to retrieve information from Exchangerate Dev without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
to | string | Yes | |
from | string | Yes | |
amount | object | Yes |
Parameters from the server's own tool schema.
Why convert is rated Low
The tool performs a read-only currency conversion calculation using current exchange rates. It explicitly states it is indicative/reference only and not for settlement or trading, meaning it moves no money and has no financial side effects. It simply retrieves and computes a converted value.
From the tool's definition Convert an amount from one currency to another at the current rate... not for settlement or trading.
Attacks that exploit this kind of access
The rule that runs convert safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Exchangerate Dev, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For convert, this is the rule to start with:
convert 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 Exchangerate Dev, apply this rule, and every convert call is checked against it from then on.
Questions about convert
Convert an amount from one currency to another at the current rate. Indicative developer-grade reference rates (aggregated market data + public reference rates), not for settlement or trading. It is categorised as a Read tool in the Exchangerate Dev MCP Server, which means it retrieves data without modifying state.
convert accepts 3 parameters: to, from, amount. Required: to, from, amount. The full parameter table on this page comes from the server's own tool schema.
Register the Exchangerate Dev MCP server in PolicyLayer and add a rule for convert: 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 Exchangerate Dev. Nothing to install.
convert 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 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. 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 is provided by the Exchangerate Dev MCP server (https://api.exchangerate.dev/v1/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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