# Japan & World Public Holidays (remote · holiday.omikuji.dev)

Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries.

- Trust score: 73/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- remote · `holiday.omikuji.dev`: 73/100 (this document), [markdown](https://verifymcp.io/servers/dev-omikuji-holiday/holiday.md), [page](https://verifymcp.io/servers/dev-omikuji-holiday/holiday)

## Channel facts

- Endpoint: `https://holiday.omikuji.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-10-23.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 57/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1072 tokens (~268/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 77% 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 4 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 Japan & World Public Holidays MCP server?

Japan & World Public Holidays is a hosted endpoint at https://holiday.omikuji.dev/mcp, so there is nothing to install locally. 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 --transport http dev-omikuji-holiday 'https://holiday.omikuji.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "dev-omikuji-holiday": {
      "url": "https://holiday.omikuji.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dev-omikuji-holiday": {
      "type": "http",
      "url": "https://holiday.omikuji.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.dev-omikuji-holiday]
url = "https://holiday.omikuji.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-omikuji-holiday": {
      "type": "remote",
      "url": "https://holiday.omikuji.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-omikuji-holiday --url 'https://holiday.omikuji.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-omikuji-holiday:
    url: "https://holiday.omikuji.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-omikuji-holiday": {
      "Transport": "http",
      "Url": "https://holiday.omikuji.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-omikuji-holiday -t streamable-http -u 'https://holiday.omikuji.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-omikuji-holiday": {
      "type": "http",
      "url": "https://holiday.omikuji.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-10-22 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-17 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 70, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-15 (score 70)

First indexed and scored.

## MCP tools (4)

### `check_dates` (~219 tokens)

Check dates

For each date, tell whether it is a Japanese national holiday (with name and kind: 祝日 / 振替休日 / 国民の休日), a weekend, and a business day. Also returns today in Japan time. With country, the same for that country (holiday names, status, make-up workdays such as China's 调休).

Input parameters:

- `country` (string): ISO 3166-1 alpha-2 country code (e.g. JP, US, CN, GB). Default JP.
- `dates` (array, required)
- `include_government` (boolean): Outside Japan: also treat days off only for government offices (e.g. Indonesia's cuti bersama, Canadian federal holidays) as days off.
- `region` (string): Outside Japan: state/province code (ISO 3166-2 suffix, e.g. CA for California) to include regional holidays.
- `year_end_closed` (boolean): Japan only: treat 12/29-1/3 as non-business days (common in Japanese companies).

### `list_holidays` (~200 tokens)

List holidays

List Japanese national holidays for a year, or between from and to. With no arguments, lists the next 10 holidays from today (Japan time). With country, lists that country's public holidays (and make-up workdays, if any).

Input parameters:

- `country` (string): ISO 3166-1 alpha-2 country code (e.g. JP, US, CN, GB). Default JP.
- `from` (string): Start date (default: today in Japan).
- `include_government` (boolean): Outside Japan: also treat days off only for government offices (e.g. Indonesia's cuti bersama, Canadian federal holidays) as days off.
- `limit` (integer)
- `region` (string): Outside Japan: state/province code (ISO 3166-2 suffix, e.g. CA for California) to include regional holidays.
- `to` (string): End date (inclusive).
- `year` (integer)

### `business_days` (~239 tokens)

Business days

Count business days between start and end (inclusive), or find the date that is N business days after start (add=N; negative N goes backward; start itself is not counted). Business day = weekday that is not a national holiday. Set year_end_closed to also skip 12/29-1/3. With country, uses that country's weekend days, holidays and make-up workdays.

Input parameters:

- `add` (integer): Move this many business days from start.
- `country` (string): ISO 3166-1 alpha-2 country code (e.g. JP, US, CN, GB). Default JP.
- `end` (string): Count up to this date (inclusive).
- `include_government` (boolean): Outside Japan: also treat days off only for government offices (e.g. Indonesia's cuti bersama, Canadian federal holidays) as days off.
- `region` (string): Outside Japan: state/province code (ISO 3166-2 suffix, e.g. CA for California) to include regional holidays.
- `start` (string, required): YYYY-MM-DD
- `year_end_closed` (boolean): Japan only.

### `find_long_weekends` (~207 tokens)

Find long weekends

Find 連休 (3+ consecutive days off made of weekends and national holidays), e.g. Golden Week, Silver Week. Give a year, or from (default today) to list upcoming ones. With country, the same for that country.

Input parameters:

- `country` (string): ISO 3166-1 alpha-2 country code (e.g. JP, US, CN, GB). Default JP.
- `from` (string): List long weekends ending on or after this date (default: today in Japan).
- `include_government` (boolean): Outside Japan: also treat days off only for government offices (e.g. Indonesia's cuti bersama, Canadian federal holidays) as days off.
- `limit` (integer)
- `min_length` (integer)
- `region` (string): Outside Japan: state/province code (ISO 3166-2 suffix, e.g. CA for California) to include regional holidays.
- `year` (integer)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-omikuji-holiday/holiday#diagnostics

## Score history

- 2026-10-23: 73
- 2026-10-22: 73
- 2026-10-21: 72
- 2026-10-20: 72
- 2026-10-19: 71
- 2026-10-18: 71
- 2026-10-17: 71
- 2026-10-16: 70
- 2026-10-15: 70

## Common questions

### What is the Japan & World Public Holidays MCP server?

Japan & World Public Holidays is an MCP server listed in the public MCP registry as dev.omikuji/holiday. Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries. This page covers its hosted endpoint (https://holiday.omikuji.dev/mcp).

### Is the Japan & World Public Holidays MCP server safe to use?

Japan & World Public Holidays scores 73 out of 100 on VerifyMCP. 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 Japan & World Public Holidays MCP server expose?

Japan & World Public Holidays exposes 4 tools: check_dates, list_holidays, business_days, find_long_weekends. Their descriptions and schemas cost roughly 865 tokens of context every time the server is loaded.

### Does the Japan & World Public Holidays MCP server require authentication?

No. We connected to Japan & World Public Holidays without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Japan & World Public Holidays MCP server still maintained?

Japan & World Public Holidays is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://holiday.omikuji.dev/mcp
- Website: https://holiday.omikuji.dev/ai/
- Changelog RSS feed: https://verifymcp.io/servers/dev-omikuji-holiday/holiday.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-omikuji-holiday/holiday.json
- HTML version of this page: https://verifymcp.io/servers/dev-omikuji-holiday/holiday