# PlugRail Japanese Calendar

> Japanese holiday and business-day calculations using official Japan Cabinet Office data.

- name: dev.plugrail/jp-calendar
- version: 0.2.0
- connection class: R0 (autonomous)
- trust: 95/100 flags: duplicate-repo
- quality: 83/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/dev.plugrail%2Fjp-calendar
- tools: https://api.protogrid.dev/v1/servers/dev.plugrail%2Fjp-calendar/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "jp-calendar": {
      "type": "http",
      "url": "https://jp-calendar.plugrail.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 96
- freshness: 100
- provenance: 100
- drivers: +repository +namespace-matches-repo +dns-namespace +website +reachable +uptime-91% +updated-13d-ago -duplicate-repo(3 names)
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 83/100 (good)

### protocol: 88 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- warn `protocol.list_ttl`: tools/list declares ttlMs 0, so clients re-fetch it on every use

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_holidays (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); is_holiday (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); add_business_days (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 672 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 4 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 4, about 672 tokens to load them all
- tool set hash: 2e86c28c338f092ce872edf0a95f84d4
- tools last changed: 2026-10-07T09:38:12.630Z
- badge: [![protogrid quality](https://protogrid.dev/badge/dev.plugrail/jp-calendar.svg)](https://protogrid.dev/servers/dev.plugrail/jp-calendar)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-07 `business_days_between` changed (inputSchema)
- 2026-10-07 `add_business_days` changed (inputSchema)
- 2026-10-07 `list_holidays` changed (inputSchema)
- 2026-10-07 `is_holiday` changed (inputSchema)

Full history: https://api.protogrid.dev/v1/servers/dev.plugrail%2Fjp-calendar/changes

## Remotes

- https://jp-calendar.plugrail.dev/mcp (streamable-http, auth none, reachable true, uptime30d 0.9074074)

## Packages

_none_

## Tools (4)

- `add_business_days`: 指定した日付(date)の翌日から数えてN営業日目(days)の日付を返します。dateの当日は数えません。daysが負の場合は過去方向（dateの前日から遡ってN営業日目）に計算します。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。dateが営業日かどうかだけ知りたい場合は is_holiday を使ってください（days=0でも同じ情報がskipped経由で得られます）。入力例: {"date": "2026-07-10", "days": 3}
- `business_days_between`: from〜to間の営業日数を数えます。既定では「fromを含まず、toを含む」境界です（例:「今日から支払期日まで何営業日か」）。include_from/include_toで境界を変更できます。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。from > to の場合はエラーにせず、from/toとinclude_from/include_toを入れ替えて計算した結果の符号を反転した値（負の営業日数）を返します（反対称則: count(A,B,x,y) = -count(B,A,y,x)。A≠B、すなわちfrom≠toの場合に成立する恒等式で、from===toはこの分岐に入らないため対象外）。入力例: {"from": "2026-07-10", "to": "2026-07-20"}
- `is_holiday`: 指定した日付が日本の祝日（国民の祝日・休日）かどうかを判定します。内閣府公表データに基づきます。入力例: {"date": "2026-01-01"}
- `list_holidays`: 指定した年または期間の日本の祝日一覧を返します。入力例: {"year": 2026} または {"from": "2026-01-01", "to": "2026-06-30"}