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Currensor

by Kay0sstheory · remote · no sign-in to list tools · v1.0.1 · published by GitHub user Kay0sstheory

Live currency conversion for 166 currencies, shown as an interactive in-chat card. No sign-in.

Final · 1
CompareRegistry entry

1 tool: 1 do something that can't be undone.

Scanned Oct 21, 2026

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

claude mcp add --transport http currensor https://currensor-mcp.currensor-mcp.workers.dev/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnconvert_currency

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

    Matched text

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

    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.

1 tool

Can't be undone 1Claude Code: ask
  • convert_currencyConvert an amount from one currency into one or more others at live market rates, shown as an interactive card.1 finding

    Why it is in this group

    • The name "convert_currency" 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_currency" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

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

      What this check looks for
    Description, as the server wrote it
    Convert an amount from one currency into one or more others at live market rates, shown as an interactive card. Use ISO 4217 codes (USD, EUR, INR, JPY…). Covers 166 currencies, refreshed hourly.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true
    • idempotentHint: 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 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http currensor https://currensor-mcp.currensor-mcp.workers.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": [],
    "ask": [
      "mcp__currensor__convert_currency"
    ],
    "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 currensor. Review it before you use it.