Japan & World Public Holidays
REMOTE · HOLIDAY.OMIKUJI.DEV
Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries.
Available components
Last scanned (16 hours ago)
Scores higher than 64% of remote servers
Reachable. Last reached 23 Oct 2026.
Category Productivity and Notes
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability57
- AI-judged instruction clarity (good).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage92
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 77% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 22 Oct 26 +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.
- 20 Oct 26 +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.
- 17 Oct 26 +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.
- 16 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 15 Oct 26 70
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 23 Oct 2026 · Probed https://holiday.omikuji.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=omikuji.dev | CN=WE1,O=Google Trust Services,C=US | 21 Sept 2026 | 20 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 14f2de63cee5ac82137eb86a39849ed1 |
| SANs: omikuji.dev, *.omikuji.dev | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of holiday.omikuji.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| omikuji.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://holiday.omikuji.dev/mcp | Verified | 200 | |
| http (plaintext) | http://holiday.omikuji.dev/mcp | HTTPS enforced | 301 | https://holiday.omikuji.dev/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
business_days Business days ~239
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | YYYY-MM-DD |
| year_end_closed | boolean | – | Japan only. |
No output schema declared.
No examples provided.
check_dates Check dates ~219
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).
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | – | ISO 3166-1 alpha-2 country code (e.g. JP, US, CN, GB). Default JP. |
| dates | array | yes | – |
| 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). |
No output schema declared.
No examples provided.
find_long_weekends Find long weekends ~207
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | – | – |
No output schema declared.
No examples provided.
list_holidays List holidays ~200
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | – | – |
No output schema declared.
No examples provided.
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.
remote · holiday.omikuji.dev
claude mcp add --transport http dev-omikuji-holiday 'https://holiday.omikuji.dev/mcp'
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.