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dev.cz-agents/cnb

by cz-agents.dev · remote · local (npm) · no sign-in to list tools · v0.1.7 · published by dev.cz-agents

Official ČNB exchange rates — daily & historical CZK vs EUR, USD, 30+ currencies. For accounting.

Final · 1Changes · 1
CompareRegistry entry

3 tools: 1 do something that can't be undone, 1 change things and 1 only read.

Scanned Oct 21, 2026

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http cnb https://cnb.cz-agents.dev/mcp

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnconvert

    The server marks "convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "convert" says "convert": a word for a change.

    What this check looks for
  • Warnget_rate

    The server marks "get_rate" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "get_rate" says "get": a word for reading.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Can't be undone 1Claude Code: ask
  • convertConvert an amount between two currencies using official ČNB rates.1 finding

    Why it is in this group

    • The name "convert" says "convert": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "convert" says "convert": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Convert an amount between two currencies using official ČNB rates. E.g., convert 100 EUR to CZK, or 50 USD to GBP (goes via CZK cross-rate). Optional `date` for historical conversion.

    Annotations the server declares

    • title: Convert Currency via ČNB Rates
    • readOnlyHint: true
    • openWorldHint: true
Changes things 1Claude Code: ask
  • get_rateQuick single-currency lookup.1 finding

    Why it is in this group

    • The name "get_rate" says "get": a word for reading.
    • The input takes a statement or command to run (input.code), which can change anything it can reach.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "get_rate" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "get_rate" says "get": a word for reading.

      What this check looks for
    Description, as the server wrote it
    Quick single-currency lookup. Returns just the CZK rate for one currency (or all rates if no code given).

    Annotations the server declares

    • title: Get Single Currency ČNB Rate
    • readOnlyHint: true
    • openWorldHint: true
Only reads 1Claude Code: allow
  • get_ratesGet official CZK exchange rates published by ČNB.No findings

    Why it is in this group

    • The name "get_rates" says "get": a word for reading.
    Description, as the server wrote it
    Get official CZK exchange rates published by ČNB. Returns all currencies from the daily sheet (~31 majors). Optional `date` parameter (YYYY-MM-DD) for historical rates; otherwise returns latest.

    Annotations the server declares

    • title: Get ČNB Daily FX Rates
    • readOnlyHint: true
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.1.7. Values in angle brackets are yours to fill in.

claude mcp add --transport http cnb https://cnb.cz-agents.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__cnb__get_rates"
    ],
    "ask": [
      "mcp__cnb__convert",
      "mcp__cnb__get_rate"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as cnb. Review it before you use it.