unsubscribe · Unfragile MCP: Risk & Policy

WHAT IT DOES

What unsubscribe does on Unfragile

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

WHY IT NEEDS A POLICY

Why unsubscribe needs a policy

Unsubscribing cancels a persistent monitor, which is a reversible modification to subscription state (the user can re-subscribe). It modifies data (removes the watch) but is not irreversible in the destructive sense, placing it in the Write category. Severity is medium because misuse could cause an agent to lose important monitoring/alerting capabilities.

From the tool's definition "Cancel a persistent watch (monitor)" — this removes/deactivates a subscription using a monitor ID returned from subscribe

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unsubscribe Rate-limited

unsubscribe 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": {
    "unsubscribe": {
      "limits": [
        {
          "counter": "unsubscribe_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 Unfragile, so you can run agents against it safely.

FAQ

Questions about unsubscribe

What does the unsubscribe tool do? +

Cancel a persistent watch (monitor). Use the monitor ID returned from subscribe. It is categorised as a Write tool in the Unfragile 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? +

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

What risk level is unsubscribe? +

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

Can I rate-limit unsubscribe? +

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

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

unsubscribe is provided by the Unfragile MCP server (savirinc/unfragile-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.