set_class · Piazza MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_class does on Piazza MCP Server

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

WHY IT NEEDS A POLICY

Why set_class needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_class Rate-limited

set_class 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": {
    "set_class": {
      "limits": [
        {
          "counter": "set_class_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 Piazza MCP Server, so you can run agents against it safely.

FAQ

Questions about set_class

What does the set_class tool do? +

Select a class to work with. Must be called once before searching or. It is categorised as a Write tool in the Piazza 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 set_class? +

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

What risk level is set_class? +

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

Can I rate-limit set_class? +

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

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

set_class is provided by the Piazza MCP Server MCP server (smchase/piazza-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.