List pending event invitations that need a response.
AI agents call get_invitations to retrieve information from Fantastical MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and lists pending invitations, which is a passive data retrieval operation with no capability to modify, delete, or execute actions. It aligns with the Read category pattern of retrieving or querying data. Severity is low because exposure of calendar invitation metadata poses minimal risk—it does not enable financial transactions, destructive actions, or code execution.
From the tool's definition Tool name 'get_invitations' and description 'List pending event invitations that need a response' indicate a read-only query operation that retrieves data without modification or side effects.
Documented attack patterns abuse exactly the kind of access get_invitations gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fantastical MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_invitations:
{
"version": "1",
"default": "deny",
"tools": {
"get_invitations": {}
}
}get_invitations is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List pending event invitations that need a response. It is categorised as a Read tool in the Fantastical MCP MCP Server, which means it retrieves data without modifying state.
Register the Fantastical MCP server in PolicyLayer and add a rule for get_invitations: 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 Fantastical MCP. Nothing to install.
get_invitations 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 get_invitations 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 get_invitations. 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.
get_invitations is provided by the Fantastical MCP server (jaydenk/fantastical-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fantastical MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
16 Fantastical MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.