AI agents call cal_event_types to retrieve information from Access 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 information about event types, slugs, durations, and scheduling URLs without modifying, executing, or deleting any data. It is purely informational retrieval with no side effects. While the Access server manages credentials and permissions, this particular tool performs only a read operation on Cal.com event type metadata, making it low-severity even in a credential management context.
From the tool's definition Tool name 'cal_event_types' and description 'List all Cal.com event types' indicate a retrieval operation. The phrase 'see which booking pages are available and their configuration' confirms read-only access to metadata about calendar event types.
Attacks that exploit this kind of access
List all Cal.com event types with their slugs, durations, and scheduling URLs. Use this to see which booking pages are available and their configuration. It is categorised as a Read tool in the Access MCP Server, which means it retrieves data without modifying state.
Register the Access MCP server in PolicyLayer and add a rule for cal_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 Access. Nothing to install.
cal_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 cal_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 cal_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.
cal_event_types is provided by the Access MCP server (scottpedia0/access). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
cal_event_types is one line of Access's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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