unsubscribe_from_events

THE RISK

Medium Risk

Why unsubscribe_from_events needs a policy

Unsubscribing from events is a Write operation because it modifies the state of the system (event subscriptions) in a reversible manner. It is not Destructive because subscriptions can be re-established, and it does not execute code or have financial implications.

From the tool's definition The tool name 'unsubscribe_from_events' and description 'Unsubscribe from all event topics' indicate it modifies subscription state by removing event subscriptions.

Documented attack patterns abuse exactly the kind of access unsubscribe_from_events gives an agent:

POLICY

How to control unsubscribe_from_events

PolicyLayer is an MCP gateway — it sits between your AI agents and Rpg, and nothing reaches the server without passing your rules. This is the rule we recommend for unsubscribe_from_events:

policy.json

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

unsubscribe_from_events 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.

Create a free account and register Rpg — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 47 Rpg tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unsubscribe_from_events

What does the unsubscribe_from_events tool do? +

Unsubscribe from all event topics. It is categorised as a Write tool in the Rpg MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unsubscribe_from_events? +

Register the Rpg MCP server in PolicyLayer and add a rule for unsubscribe_from_events: 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 Rpg. Nothing to install.

What risk level is unsubscribe_from_events? +

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

Can I rate-limit unsubscribe_from_events? +

Yes. Add a rate_limit block to the unsubscribe_from_events 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 unsubscribe_from_events completely? +

Set action: deny in the PolicyLayer policy for unsubscribe_from_events. 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 unsubscribe_from_events? +

unsubscribe_from_events is provided by the Rpg MCP server (mnehmos/mnehmos.rpg.mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Rpg tool call.

Start from Rpg, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →