# frankfurter_historical

Get historical exchange rates for a specific date from ECB.

Agent View of the PolicyLayer registry record for `frankfurter_historical`. HTML page: https://policylayer.com/tools/io-github-malamutemayhem-unclick-mcp-server/frankfurter-historical

## Facts

- Tool: `frankfurter_historical`
- Server: UnClick (`@unclick/mcp-server`) — https://policylayer.com/tools/io-github-malamutemayhem-unclick-mcp-server.md
- Install: `npx -y @unclick/mcp-server`
- Homepage: https://github.com/malamutemayhem/unclick-agent-native-endpoints.git
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 3 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `to` | string | no | Target currency code (optional) |
| `date` | string | yes | Date in YYYY-MM-DD format |
| `from` | string | no | Base currency code (default EUR) |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "frankfurter_historical",
    "arguments": {
      "date": "<date>"
    }
  }
}
```

## Why frankfurter_historical is rated Low

This tool performs a data retrieval operation against a public financial data source. It has no side effects—it does not create, modify, delete, or execute any operations. While it relates to financial data, it does not move money, commit financial obligations, or trigger any financial transactions.

From the tool's own definition: "The tool 'Get historical exchange rates for a specific date from ECB' retrieves data from an external source (European Central Bank) without modifying, deleting, or executing operations."

## Use case

AI agents call frankfurter_historical to retrieve information from UnClick without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches UnClick:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "frankfurter_historical": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-malamutemayhem-unclick-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-malamutemayhem-unclick-mcp-server