List invitees for a scheduled event
AI agents call list_invitees to retrieve information from Mcp Calendly without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns invitee information for an existing scheduled event. It performs a read-only operation that retrieves data without creating, modifying, deleting, or executing any actions. The low severity reflects minimal risk even if misused by an agent, as it only exposes scheduling metadata about participants.
From the tool's definition Tool name is 'list_invitees' and description states 'List invitees for a scheduled event' — this is a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List invitees for a scheduled event. It is categorised as a Read tool in the Mcp Calendly MCP Server, which means it retrieves data without modifying state.
Register the Mcp Calendly MCP server in PolicyLayer and add a rule for list_invitees: 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 Mcp Calendly. Nothing to install.
list_invitees 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 list_invitees 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 list_invitees. 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.
list_invitees is provided by the Mcp Calendly MCP server (shwetank-dev/mcp-server-calendly). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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