create_contact · Joe MCP: Risk & Policy

WHAT IT DOES

What create_contact does on JoeMCP

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

WHY IT NEEDS A POLICY

Why create_contact needs a policy

This tool creates new contact records in the JoeAPI system, which is a reversible write operation. It does not execute arbitrary code, delete data, move money, or perform read-only queries.

From the tool's definition Tool name 'create_contact' and description 'Create a new contact' directly indicate data creation. The server manages 'contacts' as part of a construction management system with clients, proposals, estimates, and financial data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_contact Rate-limited

create_contact 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_contact": {
      "limits": [
        {
          "counter": "create_contact_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 JoeMCP, so you can run agents against it safely.

FAQ

Questions about create_contact

What does the create_contact tool do? +

Create a new contact. It is categorised as a Write tool in the JoeMCP 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_contact? +

Register the Joe MCP server in PolicyLayer and add a rule for create_contact: 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 JoeMCP. Nothing to install.

What risk level is create_contact? +

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

Can I rate-limit create_contact? +

Yes. Add a rate_limit block to the create_contact 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_contact completely? +

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

create_contact is provided by the Joe MCP server (lumberjack-so/joemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.