AI agents call getDateByTimestamp to retrieve information from Cal Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads a timestamp value and returns its date representation. It is purely computational with no ability to modify, delete, create, or execute external operations. The conversion is deterministic and reversible, fitting the Read category for data retrieval and queries.
From the tool's definition Tool name and description indicate a retrieval/conversion operation: 'Convert the provided timestamp to date format' performs a read-only transformation of input data with no side effects or state changes.
Documented attack patterns abuse exactly the kind of access getDateByTimestamp gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cal Server, and nothing reaches the server without passing your rules. This is the rule we recommend for getDateByTimestamp:
{
"version": "1",
"default": "deny",
"tools": {
"getDateByTimestamp": {}
}
}getDateByTimestamp is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Convert the provided timestamp to date format. It is categorised as a Read tool in the Cal Server MCP Server, which means it retrieves data without modifying state.
Register the Cal Server MCP server in PolicyLayer and add a rule for getDateByTimestamp: 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 Cal Server. Nothing to install.
getDateByTimestamp 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 getDateByTimestamp 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 getDateByTimestamp. 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.
getDateByTimestamp is provided by the Cal Server MCP server (pwh-pwh/cal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cal Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 Cal Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.