evaluate_nlu · Dialogflow CX MCP Server MCP: Risk & Policy

WHAT IT DOES

What evaluate_nlu does on Dialogflow CX MCP Server

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

WHY IT NEEDS A POLICY

Why evaluate_nlu needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

evaluate_nlu Rate-limited

evaluate_nlu 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": {
    "evaluate_nlu": {
      "limits": [
        {
          "counter": "evaluate_nlu_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 Dialogflow CX MCP Server, so you can run agents against it safely.

FAQ

Questions about evaluate_nlu

What does the evaluate_nlu tool do? +

evaluate_nlu. It is categorised as a Write tool in the Dialogflow CX 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 evaluate_nlu? +

Register the Dialogflow CX MCP Server MCP server in PolicyLayer and add a rule for evaluate_nlu: 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 Dialogflow CX MCP Server. Nothing to install.

What risk level is evaluate_nlu? +

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

Can I rate-limit evaluate_nlu? +

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

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

evaluate_nlu is provided by the Dialogflow CX MCP Server MCP server (yash-kavaiya/conversation_agents_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.