update_contact_phone · CATS MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_contact_phone does on CATS MCP Server

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

WHY IT NEEDS A POLICY

Why update_contact_phone needs a policy

This tool modifies contact information (phone number) in a recruiting/applicant tracking system. It is reversible (a phone can be updated again), so it falls into the Write category rather than Destructive. Severity is medium because unauthorized contact data modification could cause operational disruption or affect communication with candidates/recruiters, but it doesn't cause permanent loss or financial impact.

From the tool's definition Tool name 'update_contact_phone' indicates modification of contact data. The 'update_' prefix and context within CATS (applicant tracking system) managing contacts clearly shows reversible data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_contact_phone Rate-limited

update_contact_phone 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": {
    "update_contact_phone": {
      "limits": [
        {
          "counter": "update_contact_phone_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 CATS MCP Server, so you can run agents against it safely.

FAQ

Questions about update_contact_phone

What does the update_contact_phone tool do? +

update_contact_phone. It is categorised as a Write tool in the CATS 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 update_contact_phone? +

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

What risk level is update_contact_phone? +

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

Can I rate-limit update_contact_phone? +

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

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

update_contact_phone is provided by the CATS MCP Server MCP server (vanman2024/cats-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.