AI agents call datetime.now to retrieve information from Datetime without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the current date/time from the host OS clock with no side effects, matching the Read category (retrieves or queries data; no side effects). The severity is low because timestamp information poses minimal security risk when disclosed, and the tool cannot modify, execute, or delete anything.
From the tool's definition Tool name 'datetime.now' combined with server description stating it 'provides date and time tools' and 'retrieve current timestamps'. The empty tool description is consistent with a simple timestamp retrieval function.
Documented attack patterns abuse exactly the kind of access datetime.now gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Datetime, and nothing reaches the server without passing your rules. This is the rule we recommend for datetime.now:
{
"version": "1",
"default": "deny",
"tools": {
"datetime.now": {}
}
}datetime.now is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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datetime.now. It is categorised as a Read tool in the Datetime MCP Server, which means it retrieves data without modifying state.
Register the Datetime MCP server in PolicyLayer and add a rule for datetime.now: 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. Nothing to install.
datetime.now 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 datetime.now 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 datetime.now. 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.
datetime.now is provided by the Datetime MCP server (joshuaboys/datetime-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Datetime, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Datetime tools catalogued and risk-classified — across an index of 43,000+ MCP servers.