AI agents call exchangerate_codes to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
api_key | string | — | ExchangeRate-API key (required) |
Parameters from the server's own tool schema.
This tool queries and returns a static list of currency codes and names. It performs no writes, deletions, code execution, or financial transactions. The requirement for an API key is a common authentication mechanism and does not change the fundamental Read nature of the operation. The blast radius of misuse is minimal—an attacker gains knowledge of supported currencies but cannot modify data or cause harm.
From the tool's definition Tool description states 'List all supported currency codes' — a retrieval operation with no side effects.
Risk signalsHandles credentials or secrets (api_key)
Attacks that exploit this kind of access
List all supported currency codes and their names. Requires an API key. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
exchangerate_codes accepts 1 parameter: api_key. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for exchangerate_codes: 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 UnClick. Nothing to install.
exchangerate_codes 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 exchangerate_codes 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 exchangerate_codes. 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.
exchangerate_codes is provided by the UnClick MCP server (@unclick/mcp-server). 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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