exchangerate_convert · UnClick MCP: Risk & Policy

WHAT IT DOES

What exchangerate_convert does on UnClick

AI agents use exchangerate_convert to create or update resources in UnClick — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UnClick environment.

PARAMETERS

Parameter	Type	Required	Description
`to`	string	Yes	Target currency code (e.g. EUR)
`from`	string	Yes	Source currency code (e.g. USD)
`amount`	number	—	Amount to convert (default 1)
`api_key`	string	—	Optional for conversion (uses latest rates if omitted)

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why exchangerate_convert needs a policy

An AI agent can call exchangerate_convert faster than any human can review — one bad instruction and it creates or modifies resources in UnClick by the hundred, each call as confident as the last.

Risk signalsHandles credentials or secrets (api_key)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

exchangerate_convert Rate-limited

exchangerate_convert stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "exchangerate_convert": {
      "limits": [
        {
          "counter": "exchangerate_convert_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches UnClick, so you can run agents against it safely.

FAQ

Questions about exchangerate_convert

What does the exchangerate_convert tool do? +

Convert an amount from one currency to another. It is categorised as a Write tool in the UnClick MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does exchangerate_convert accept? +

exchangerate_convert accepts 4 parameters: to, from, amount, api_key. Required: to, from. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on exchangerate_convert? +

Register the UnClick MCP server in PolicyLayer and add a rule for exchangerate_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 UnClick. Nothing to install.

What risk level is exchangerate_convert? +

exchangerate_convert is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit exchangerate_convert? +

Yes. Add a rate_limit block to the exchangerate_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.

How do I block exchangerate_convert completely? +

Set action: deny in the PolicyLayer policy for exchangerate_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.

What MCP server provides exchangerate_convert? +

exchangerate_convert 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.