# Korea Business Calendar (npm · @appmonster/mcp-kr-biz-calendar)

Korean tax/payroll deadlines, public holidays, business-day math. No keys. 세무 일정·영업일 MCP.

- Trust score: 76/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-24

## Components

- npm · `@appmonster/mcp-kr-biz-calendar`: 76/100 (this document), [markdown](https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar.md), [page](https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar)

## Channel facts

- Registry: `npm`
- Package: `@appmonster/mcp-kr-biz-calendar`
- Version: `0.1.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-24.

- **Supply Chain Security**: 81/100
  - No malware found by supply-chain analysis.
  - CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available.
  - No install/post-install scripts declared.
  - 30 of 93 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to groove79/kmcp).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 733 tokens (~146/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 81% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Korea Business Calendar MCP server?

Korea Business Calendar runs locally as an npm package, launched with npx -y @appmonster/mcp-kr-biz-calendar. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add groove79-mcp-kr-biz-calendar -- npx -y @appmonster/mcp-kr-biz-calendar
```

### Cursor

```json
{
  "mcpServers": {
    "groove79-mcp-kr-biz-calendar": {
      "command": "npx",
      "args": [
        "-y",
        "@appmonster/mcp-kr-biz-calendar"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "groove79-mcp-kr-biz-calendar": {
      "command": "npx",
      "args": [
        "-y",
        "@appmonster/mcp-kr-biz-calendar"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add groove79-mcp-kr-biz-calendar -- npx -y @appmonster/mcp-kr-biz-calendar
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "groove79-mcp-kr-biz-calendar": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@appmonster/mcp-kr-biz-calendar"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add groove79-mcp-kr-biz-calendar --command npx --arg -y --arg @appmonster/mcp-kr-biz-calendar
```

### Hermes

```yaml
mcp_servers:
  groove79-mcp-kr-biz-calendar:
    command: "npx"
    args: ["-y", "@appmonster/mcp-kr-biz-calendar"]
```

### Netclaw

```json
{
  "McpServers": {
    "groove79-mcp-kr-biz-calendar": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@appmonster/mcp-kr-biz-calendar"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add groove79-mcp-kr-biz-calendar -t stdio -c npx -a -y @appmonster/mcp-kr-biz-calendar
```

### Other

```json
{
  "mcpServers": {
    "groove79-mcp-kr-biz-calendar": {
      "command": "npx",
      "args": [
        "-y",
        "@appmonster/mcp-kr-biz-calendar"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-24 (score 76, +10)

- [security regression] CVE-2023-54404 affects this package: high
- [security regression] Known CVEs: pass → fail
- [security improvement] Malware scan: unverified → pass

### 2026-10-23 (score 66, −14)

- [security regression] Malware scan: pass → unverified
- [functional improvement] Stability: unverified → 0.07
- [functional] Package version: 0.1.0 → 0.1.1

### 2026-10-22 (score 80, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-21 (score 65)

First indexed and scored.

## MCP tools (5)

### `kr_list_holidays` (~113 tokens)

List Korean public holidays for a year including computed 대체공휴일 (substitute holidays) and election days. Offline; lunar dates tabled for 2025–2028. 연도별 공휴일(대체공휴일 포함)을 반환합니다. Use for scheduling, delivery promises, payroll calendars. Needs year.

Input parameters:

- `extraHolidays` (array): Additional holidays (e.g. from kr_holidays of the public-data server, or company days off)
- `year` (integer, required)

### `kr_is_business_day` (~105 tokens)

Tell whether a date is a Korean business day (평일, not a public holiday), and give the next and previous business days. 해당 날짜가 영업일인지 확인합니다. Use before promising a delivery/meeting date. Needs a date (default today, KST).

Input parameters:

- `date` (string): yyyy-MM-dd
- `extraHolidays` (array): Additional holidays (e.g. from kr_holidays of the public-data server, or company days off)

### `kr_add_business_days` (~153 tokens)

Add (or subtract) N Korean business days to a date, skipping weekends and public holidays — e.g. '3 business days after today' for shipping ETAs, or count business days between two dates. 영업일 기준으로 날짜를 더하거나 두 날짜 사이 영업일 수를 셉니다. Use for 납기·배송·결제 기한 계산. Needs from (default today) and either days or to.

Input parameters:

- `days` (integer)
- `extraHolidays` (array): Additional holidays (e.g. from kr_holidays of the public-data server, or company days off)
- `from` (string): yyyy-MM-dd
- `to`: yyyy-MM-dd

### `kr_tax_calendar` (~281 tokens)

Korean tax & payroll filing deadlines for a business profile: VAT (부가세 확정·예정), income/corporate tax, withholding (원천세) and 4대보험 monthly, 지급명세서, 연말정산 — each shifted to the next business day when it falls on a holiday. Filter by month or 'upcoming'. 사업자 유형별 세무·노무 신고 일정을 반환합니다. Use for '이번 달 신고할 것', reminders, cash planning. Needs entity (individual/simplified/corporation/taxfree); employees true if you pay anyone.

Input parameters:

- `employees` (boolean): true → 원천세·4대보험·지급명세서 포함
- `entity` (string): individual=개인 일반과세, simplified=간이과세, corporation=법인(12월 결산), taxfree=면세사업자
- `extraHolidays` (array): Additional holidays (e.g. from kr_holidays of the public-data server, or company days off)
- `month` (integer)
- `upcomingDays` (integer): Only deadlines within N days from today (KST)
- `withholdingHalfYear` (boolean): 원천세 반기납부 승인 사업자
- `year` (integer): Default: current year (KST)

### `kr_tax_rule` (~81 tokens)

Explain one recurring Korean tax/payroll obligation by id (from kr_tax_calendar): what it is, who files, when, and the base dates. 세무 일정 항목의 설명을 반환합니다. Use when the agent needs to tell the owner what a deadline means. Needs id.

Input parameters:

- `id` (string): Omit to list all rule ids

## Diagnostics

Captured diagnostic sections: Provenance, Vulnerabilities, Dependencies. The full working is on the page: https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar#diagnostics

## Score history

- 2026-10-24: 76
- 2026-10-23: 66
- 2026-10-22: 80
- 2026-10-21: 65

## Common questions

### What is the Korea Business Calendar MCP server?

Korea Business Calendar is an MCP server listed in the public MCP registry as io.github.groove79/mcp-kr-biz-calendar. Korean tax/payroll deadlines, public holidays, business-day math. No keys. 세무 일정·영업일 MCP. This page covers its npm package (@appmonster/mcp-kr-biz-calendar).

### Is the Korea Business Calendar MCP server safe to use?

Korea Business Calendar scores 76 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 24 October 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Korea Business Calendar MCP server expose?

Korea Business Calendar exposes 5 tools: kr_list_holidays, kr_is_business_day, kr_add_business_days, kr_tax_calendar, kr_tax_rule. Their descriptions and schemas cost roughly 733 tokens of context every time the server is loaded.

### Is the Korea Business Calendar MCP server still maintained?

Korea Business Calendar is still listed as active in the MCP registry. We last reached this channel on 24 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Korea Business Calendar MCP server under?

Korea Business Calendar declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@appmonster/mcp-kr-biz-calendar
- Socket report: https://socket.dev/npm/package/@appmonster/mcp-kr-biz-calendar
- Repository: https://github.com/groove79/kmcp
- Website: https://appmonster.co.kr/
- Changelog RSS feed: https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar.xml
- Changelog JSON feed: https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar.json
- HTML version of this page: https://verifymcp.io/servers/groove79-mcp-kr-biz-calendar/appmonster-mcp-kr-biz-calendar