calendar.holidays
List the official holidays for a country and year with exact observed dates, including substitute days (e.g. a Saturday July 4th observed Friday). 200+ countries, regional subdivisions (US states, German Länder, Canadian provinces…), movable feasts and lunar-calendar holidays computed from mainta...
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What calendar.holidays does on Mcp
AI agents call calendar.holidays to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why calendar.holidays is rated Low
This tool retrieves and queries holiday information for countries and regions with no side effects. It performs a simple data lookup operation that returns structured information about public holidays, with filtering and localization options. There is no capability to modify data, execute code, delete information, or perform financial transactions. This is a straightforward informational read operation.
From the tool's definition Tool description explicitly states it 'List[s] the official holidays' and 'Returns {date, name, type, substitute, rule} per holiday'. No modification, deletion, execution, or financial operations are described.
Attacks that exploit this kind of access
The rule that runs calendar.holidays safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For calendar.holidays, this is the rule to start with:
calendar.holidays 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 Mcp, apply this rule, and every calendar.holidays call is checked against it from then on.
Questions about calendar.holidays
List the official holidays for a country and year with exact observed dates, including substitute days (e.g. a Saturday July 4th observed Friday). 200+ countries, regional subdivisions (US states, German Länder, Canadian provinces…), movable feasts and lunar-calendar holidays computed from maintained rules. Filter by type (public, bank, school, optional, observance) and localize names via lang. Returns {date, name, type, substitute, rule} per holiday. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for calendar.holidays: 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 Mcp. Nothing to install.
calendar.holidays 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 calendar.holidays 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 calendar.holidays. 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.
calendar.holidays is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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