Get all registrations for an event. Only available to the event organizer.
AI agents call get_event_registrations to retrieve information from EventHorizon MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves registration data for an event, which is a read-only operation with no data modification. However, severity is elevated to 'medium' rather than 'low' because the tool exposes sensitive personal information (attendee registration details) that is restricted to event organizers.
From the tool's definition Tool performs a retrieval operation: 'Get all registrations for an event.' The description explicitly states it retrieves data with no mention of modification, deletion, or side effects. The function is a 'get' operation, consistent with the Read category.
Attacks that exploit this kind of access
Get all registrations for an event. Only available to the event organizer. It is categorised as a Read tool in the EventHorizon MCP Server MCP Server, which means it retrieves data without modifying state.
Register the EventHorizon MCP Server MCP server in PolicyLayer and add a rule for get_event_registrations: 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 EventHorizon MCP Server. Nothing to install.
get_event_registrations 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_event_registrations 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_event_registrations. 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_event_registrations is provided by the EventHorizon MCP Server MCP server (notoriousarnav/eventhorizon-mcp). 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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