Expand a recurrence rule (RRULE) into concrete event instances.
Part of the Temporal Cortex MCP server.
Free to start. No card required.
AI agents call expand_rrule to retrieve information from Temporal Cortex MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though expand_rrule only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"expand_rrule": {}
}
}See the full Temporal Cortex MCP policy for all 12 tools.
These attack patterns abuse exactly the kind of access expand_rrule gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Expand a recurrence rule (RRULE) into concrete event instances.. It is categorised as a Read tool in the Temporal Cortex MCP MCP Server, which means it retrieves data without modifying state.
Register the Temporal Cortex MCP server in PolicyLayer and add a rule for expand_rrule: 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 Temporal Cortex MCP. Nothing to install.
expand_rrule 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 expand_rrule 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 expand_rrule. 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.
expand_rrule is provided by the Temporal Cortex MCP server (temporal-cortex/cortex-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Temporal Cortex MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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