isWorkingDay
Reports whether one specific date is a working day in a given country. Requires country and date. For a whole month or year use /workingdays.
This record as markdown: /tools/com-api-ninjas-mcp/isworkingday.md
What isWorkingDay does on API Ninjas
AI agents call isWorkingDay to retrieve information from API Ninjas 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 | Date in YYYY-MM-DD format. Must be between 1980-01-01 and 2050-12-31 (inclusive). Dates in future calendar years are for premium subscribers only; Free plans ca |
country | string | Yes | Country as a 2-letter ISO 3166-1 alpha-2 code (preferred, e.g. `US`), a 3-letter alpha-3 code (e.g. `USA`) or an English country name (e.g. `United States`). No |
weekend | string | — | Comma-separated weekend day codes from mon, tue, wed, thu, fri, sat and sun (e.g. `fri,sat`). Overrides the country's default weekend. If omitted or empty, the |
subdivision | string | — | ISO 3166-2 code of a state, province or region (e.g. `US-CA`, or just its suffix). Regional holidays count only when you pass the region they apply to. An unkno |
public_holidays | boolean | — | Whether to count public holidays as non-working days (true/false). Defaults to true. With false, only weekends are non-working days, and any valid country can b |
Parameters from the server's own tool schema.
Why isWorkingDay is rated Low
Even though isWorkingDay 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 isWorkingDay safely
PolicyLayer is an MCP gateway: it sits between your AI agents and API Ninjas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For isWorkingDay, this is the rule to start with:
isWorkingDay 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 API Ninjas, apply this rule, and every isWorkingDay call is checked against it from then on.
Questions about isWorkingDay
Reports whether one specific date is a working day in a given country. Requires country and date. For a whole month or year use /workingdays. It is categorised as a Read tool in the API Ninjas MCP Server, which means it retrieves data without modifying state.
isWorkingDay accepts 5 parameters: date, country, weekend, subdivision, public_holidays. Required: date, country. The full parameter table on this page comes from the server's own tool schema.
Register the API Ninjas MCP server in PolicyLayer and add a rule for isWorkingDay: 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 API Ninjas. Nothing to install.
isWorkingDay 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 isWorkingDay 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 isWorkingDay. 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.
isWorkingDay is provided by the API Ninjas MCP server (https://mcp.api-ninjas.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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