List the user
AI agents call list_event_types 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 retrieves/queries event types from Calendly without modifying or deleting data. It has no side effects and follows the pattern of data retrieval tools on this server. The incomplete description ('List the user') suggests a read operation to enumerate event types.
From the tool's definition Tool name 'list_event_types' and the broader server description indicating it 'provides tools for checking user availability' and listing capabilities.
Attacks that exploit this kind of access
List the user. 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_event_types: 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_event_types 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_event_types 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_event_types. 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_event_types 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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