register_for_event · EventHorizon MCP Server MCP

WHAT IT DOES

What register_for_event does on EventHorizon MCP Server

AI agents use register_for_event to create or update resources in EventHorizon MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your EventHorizon MCP Server environment.

WHY IT NEEDS A POLICY

Why register_for_event needs a policy

Registration is a reversible data modification (the user can typically unregister via manage_registration or similar). It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool name 'register_for_event' and description 'Register the current user for an event' indicate the tool creates a new registration record, which modifies data in the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_for_event Rate-limited

register_for_event stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "register_for_event": {
      "limits": [
        {
          "counter": "register_for_event_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches EventHorizon MCP Server, so you can run agents against it safely.

FAQ

Questions about register_for_event

What does the register_for_event tool do? +

Register the current user for an event. It is categorised as a Write tool in the EventHorizon MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_for_event? +

Register the EventHorizon MCP Server MCP server in PolicyLayer and add a rule for register_for_event: 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.

What risk level is register_for_event? +

register_for_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit register_for_event? +

Yes. Add a rate_limit block to the register_for_event 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.

How do I block register_for_event completely? +

Set action: deny in the PolicyLayer policy for register_for_event. 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.

What MCP server provides register_for_event? +

register_for_event 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.