create_person · MCP Traits Matcher MCP: Risk & Policy

WHAT IT DOES

What create_person does on MCP Traits Matcher

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

WHY IT NEEDS A POLICY

Why create_person needs a policy

This tool creates new data (a person record) in the system, which is a reversible write operation. It does not execute code, delete data, move money, or trigger external operations. The severity is low because creating a person record has minimal blast radius—the data can be deleted or modified later, and there are no destructive, financial, or code execution consequences.

From the tool's definition The tool description states it 'Creates a new person' which is a data creation operation. The server context indicates it creates persons with traits in a personality analysis system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_person Rate-limited

create_person 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": {
    "create_person": {
      "limits": [
        {
          "counter": "create_person_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 MCP Traits Matcher, so you can run agents against it safely.

FAQ

Questions about create_person

What does the create_person tool do? +

Creates a new person with the given name. It is categorised as a Write tool in the MCP Traits Matcher MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_person? +

Register the MCP Traits Matcher MCP server in PolicyLayer and add a rule for create_person: 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 MCP Traits Matcher. Nothing to install.

What risk level is create_person? +

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

Can I rate-limit create_person? +

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

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

create_person is provided by the MCP Traits Matcher MCP server (waifuai/mcp-traits-matcher). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.