# frankfurter-historical

Get ECB reference FX rates for a specific historical date.

Agent View of the PolicyLayer registry record for `frankfurter-historical`. HTML page: https://policylayer.com/tools/io-github-derekslinz-meta-data-mcp/frankfurter-historical

## Facts

- Tool: `frankfurter-historical`
- Server: Meta Data Mcp (`pypi:meta-data-mcp`) — https://policylayer.com/tools/io-github-derekslinz-meta-data-mcp.md
- Install: `npx -y pypi:meta-data-mcp`
- Homepage: https://github.com/derekslinz/meta-data-mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "frankfurter-historical",
    "arguments": {}
  }
}
```

## Why frankfurter-historical is rated Low

This tool queries public financial reference data (historical FX rates) without the ability to execute trades, move money, modify records, or trigger irreversible actions. It is purely informational retrieval of historical data from a public API. While it touches the financial domain, it does not commit financial obligations or execute transactions—merely read-access to historical rates.

From the tool's own definition: "Tool retrieves historical FX rates from ECB (European Central Bank) reference data. The verb 'Get' and domain of querying historical exchange rate data indicates read-only retrieval with no modification or side effects."

## Use case

AI agents call frankfurter-historical to retrieve information from Meta Data Mcp 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 Meta Data Mcp:

```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`

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