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OSVcalc

by osvcalc.cz · remote · no sign-in to list tools · v1.0.1 · published by cz.osvcalc

Czech OSVČ tax calculator: income tax, social and health insurance, VAT, paušální daň.

Changes · 1
CompareRegistry entry

2 tools: 1 change things and 1 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http osvcalc https://osvcalc.cz/api/mcp

Tools

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

2 tools

Changes things 1Claude Code: ask
  • calculate_osvc_taxesComputes the 2026 income tax, social and health insurance doplatek for a Czech OSVČ (self-employed person), given what they've been paid so far this year and their situation.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Computes the 2026 income tax, social and health insurance doplatek for a Czech OSVČ (self-employed person), given what they've been paid so far this year and their situation. Also returns VAT registration status, a regime comparison, next year's advances, and a filing guide, with an explanation in the requested locale. Income counts when it's actually received into the account, not when it was invoiced (cash basis), so 'income' should only be what's been paid so far this year, and 'monthly' is a separate estimate of what's still expected between now and December. For example, income: 300000, currentMonth: 6, monthly: 50000 means 300 000 Kč has been received through June, and about 50 000 Kč/month is expected July through December on top of that. Call get_field_guide first if you need to explain an option to the user before they've decided on a value.

    Annotations the server declares

    • title: Calculate OSVČ taxes
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 1Claude Code: allow
  • get_field_guideReturns every field calculate_osvc_taxes accepts, grouped the way the web calculator groups them, with the same label and explanation shown in its tooltips.No findings

    Why it is in this group

    • The name "get_field_guide" says "get": a word for reading.
    Description, as the server wrote it
    Returns every field calculate_osvc_taxes accepts, grouped the way the web calculator groups them, with the same label and explanation shown in its tooltips. Use this to explain an option to the user before they've decided on a value, without running a calculation.

    Annotations the server declares

    • title: Get OSVČ calculator field guide
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

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 osvcalc https://osvcalc.cz/api/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__osvcalc__get_field_guide"
    ],
    "ask": [
      "mcp__osvcalc__calculate_osvc_taxes"
    ],
    "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 osvcalc. Review it before you use it.