check_japan_national_working_day
Use this when you need Japan statutory national-holiday status for 2026-2027. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you need a company, school, bank, exchange or prefectural closure calendar. ...
This record as markdown: /tools/com-tttkmbb-calcgrid/check-japan-national-working-day.md
What check_japan_national_working_day does on Calcgrid
AI agents call check_japan_national_working_day to retrieve information from Calcgrid without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
date | string | Yes | Gregorian date in the pinned Cabinet Office 2026-2027 coverage. |
Parameters from the server's own tool schema.
Why check_japan_national_working_day is rated Low
Even though check_japan_national_working_day only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs check_japan_national_working_day safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Calcgrid, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For check_japan_national_working_day, this is the rule to start with:
check_japan_national_working_day is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Calcgrid, apply this rule, and every check_japan_national_working_day call is checked against it from then on.
Questions about check_japan_national_working_day
Use this when you need Japan statutory national-holiday status for 2026-2027. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you need a company, school, bank, exchange or prefectural closure calendar. What it computes: Checks a date against Japan's statutory national holidays and Saturday/Sunday baseline. Example user requests: Is 2027-03-22 a Japan working day? Inputs: date (date). Complete JSON argument examples: {"date":"2027-03-22"} Outputs: territory, territory_name, weekday, is_working_day, day_type, holiday_names, holiday_kinds, holiday_legal_bases, weekend_days, calendar_scope, rest_day_policy, calendar_profile, dataset_version, sources. Formula: is_working_day = Japan weekday baseline and no Cabinet Office statutory holiday Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/japan-national-working-day with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/everyday/japan-national-working-day.md. It is categorised as a Read tool in the Calcgrid MCP Server, which means it retrieves data without modifying state.
check_japan_national_working_day accepts 1 parameter: date. Required: date. The full parameter table on this page comes from the server's own tool schema.
Register the Calcgrid MCP server in PolicyLayer and add a rule for check_japan_national_working_day: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Calcgrid. Nothing to install.
check_japan_national_working_day is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the check_japan_national_working_day rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for check_japan_national_working_day. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
check_japan_national_working_day is provided by the Calcgrid MCP server (https://tttkmbb.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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