Get the day of the week for a given date. Returns the day name in English (e.g., Monday, Tuesday, etc.).
AI agents call day_of_week to retrieve information from DateTime MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of temporal data (day-of-week calculation from a date). It has no parameters beyond the date input, makes no modifications, executes no commands, and causes no side effects. It is categorized as Read with low severity because misuse poses no risk to data integrity, system state, or user security.
From the tool's definition Tool 'day_of_week' retrieves and returns the day name for a given date with no side effects. The description explicitly states it 'Returns the day name' — a pure query operation.
Attacks that exploit this kind of access
Get the day of the week for a given date. Returns the day name in English (e.g., Monday, Tuesday, etc.). It is categorised as a Read tool in the DateTime MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DateTime MCP Server MCP server in PolicyLayer and add a rule for day_of_week: 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 DateTime MCP Server. Nothing to install.
day_of_week 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 day_of_week 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 day_of_week. 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.
day_of_week is provided by the DateTime MCP Server MCP server (ryddle/datetime-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.
Teams ship this data inside their own products. See what a licence covers →