unsubscribe_resource · Todos MCP: Risk & Policy

WHAT IT DOES

What unsubscribe_resource does on Todos

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

WHY IT NEEDS A POLICY

Why unsubscribe_resource needs a policy

Unsubscribing modifies a subscription state (removes a subscription), which is a reversible write operation. It doesn't delete data itself, just changes the subscription relationship. Severity is low as the blast radius is limited to losing notifications/updates for a resource.

From the tool's definition Unsubscribe from a resource URI

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unsubscribe_resource Rate-limited

unsubscribe_resource 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_resource": {
      "limits": [
        {
          "counter": "unsubscribe_resource_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 Todos, so you can run agents against it safely.

FAQ

Questions about unsubscribe_resource

What does the unsubscribe_resource tool do? +

Unsubscribe from a resource URI. It is categorised as a Write tool in the Todos 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_resource? +

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

What risk level is unsubscribe_resource? +

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

Can I rate-limit unsubscribe_resource? +

Yes. Add a rate_limit block to the unsubscribe_resource 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_resource completely? +

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

unsubscribe_resource is provided by the Todos MCP server (@hasna/todos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.