define_custom_metric · Ai Analyst MCP: Risk & Policy

WHAT IT DOES

What define_custom_metric does on Ai Analyst

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

WHY IT NEEDS A POLICY

Why define_custom_metric needs a policy

The name implies creating/writing a new custom metric definition, which is a reversible write operation. Sibling tool 'delete_custom_metric' further supports that custom metrics can be created and deleted, confirming this is a Write action. Confidence is reduced due to the empty description.

From the tool's definition Tool name 'define_custom_metric' suggests creating or defining a new custom metric; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

define_custom_metric Rate-limited

define_custom_metric 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": {
    "define_custom_metric": {
      "limits": [
        {
          "counter": "define_custom_metric_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 Ai Analyst, so you can run agents against it safely.

FAQ

Questions about define_custom_metric

What does the define_custom_metric tool do? +

define_custom_metric. It is categorised as a Write tool in the Ai Analyst MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on define_custom_metric? +

Register the Ai Analyst MCP server in PolicyLayer and add a rule for define_custom_metric: 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 Ai Analyst. Nothing to install.

What risk level is define_custom_metric? +

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

Can I rate-limit define_custom_metric? +

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

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

define_custom_metric is provided by the Ai Analyst MCP server (sbdk-dev/local-ai-analyst). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.