custom_subscriptions_update_items

WHAT IT DOES

What custom_subscriptions_update_items does on StealthSurf MCP Server

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

WHY IT NEEDS A POLICY

Why custom_subscriptions_update_items needs a policy

An AI agent can call custom_subscriptions_update_items faster than any human can review — one bad instruction and it creates or modifies resources in StealthSurf MCP Server by the hundred, each call as confident as the last.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

custom_subscriptions_update_items Rate-limited

custom_subscriptions_update_items 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": {
    "custom_subscriptions_update_items": {
      "limits": [
        {
          "counter": "custom_subscriptions_update_items_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 StealthSurf MCP Server, so you can run agents against it safely.

FAQ

Questions about custom_subscriptions_update_items

What does the custom_subscriptions_update_items tool do? +

Replace all items in a custom subscription (full update). Removes existing items and sets new ones. Use custom_subscriptions_get_available_items to see what. It is categorised as a Write tool in the StealthSurf 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 custom_subscriptions_update_items? +

Register the StealthSurf MCP Server MCP server in PolicyLayer and add a rule for custom_subscriptions_update_items: 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 StealthSurf MCP Server. Nothing to install.

What risk level is custom_subscriptions_update_items? +

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

Can I rate-limit custom_subscriptions_update_items? +

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

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

custom_subscriptions_update_items is provided by the StealthSurf MCP Server MCP server (stealthsurf-vpn/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.