subscribe_to_parameter_updates · Sushi MCP Server MCP

WHAT IT DOES

What subscribe_to_parameter_updates does on Sushi MCP Server

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

WHY IT NEEDS A POLICY

Why subscribe_to_parameter_updates needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

subscribe_to_parameter_updates Rate-limited

subscribe_to_parameter_updates 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": {
    "subscribe_to_parameter_updates": {
      "limits": [
        {
          "counter": "subscribe_to_parameter_updates_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about subscribe_to_parameter_updates

What does the subscribe_to_parameter_updates tool do? +

Enable or disable real-time parameter update subscriptions. It is categorised as a Write tool in the Sushi 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 subscribe_to_parameter_updates? +

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

What risk level is subscribe_to_parameter_updates? +

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

Can I rate-limit subscribe_to_parameter_updates? +

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

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

subscribe_to_parameter_updates is provided by the Sushi MCP Server MCP server (nagarjun226/sushi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.