Returns the next upcoming Jewish holiday according to the Hebrew calendar.
AI agents call get_the_next_holiday to retrieve information from Hebcal MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries calendar data and returns information about upcoming holidays. It performs a read-only lookup against the Hebcal API with no capacity to modify, delete, execute code, or create financial obligations. Even if misused by an AI agent, the only effect is retrieval of already-public holiday calendar information.
From the tool's definition Tool description states it 'Returns the next upcoming Jewish holiday' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
Returns the next upcoming Jewish holiday according to the Hebrew calendar. It is categorised as a Read tool in the Hebcal MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Hebcal MCP Server MCP server in PolicyLayer and add a rule for get_the_next_holiday: 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 Hebcal MCP Server. Nothing to install.
get_the_next_holiday 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 get_the_next_holiday 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 get_the_next_holiday. 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.
get_the_next_holiday is provided by the Hebcal MCP Server MCP server (shaymc3/hebcal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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