List calendar events in a date range. Recurring events are properly expanded. Optionally filter by calendar ID.
AI agents call calendar.list_events to retrieve information from Orchard without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries calendar event data without any side effects. It performs a read-only operation on existing calendar data, matching the Read category definition of retrieving or querying data without side effects (list, get, fetch). The worst-case misuse would be unauthorized information disclosure of calendar contents, which is low severity compared to other risk categories.
From the tool's definition Tool name is 'list_events' and description states 'List calendar events in a date range' with optional filtering. These are query operations with no modification, creation, or deletion of data.
Documented attack patterns abuse exactly the kind of access calendar.list_events gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Orchard, and nothing reaches the server without passing your rules. This is the rule we recommend for calendar.list_events:
{
"version": "1",
"default": "deny",
"tools": {
"calendar.list_events": {}
}
}calendar.list_events is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List calendar events in a date range. Recurring events are properly expanded. Optionally filter by calendar ID. It is categorised as a Read tool in the Orchard MCP Server, which means it retrieves data without modifying state.
Register the Orchard MCP server in PolicyLayer and add a rule for calendar.list_events: 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 Orchard. Nothing to install.
calendar.list_events 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 calendar.list_events 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 calendar.list_events. 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.
calendar.list_events is provided by the Orchard MCP server (l22-io/orchard-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Orchard, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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65 Orchard tools catalogued and risk-classified — across an index of 43,000+ MCP servers.