update_candidate_phone · CATS MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_candidate_phone does on CATS MCP Server

AI agents use update_candidate_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_candidate_phone needs a policy

This tool modifies candidate records by updating phone information. While the description is empty (lowering confidence slightly), the tool name and server context indicate it performs a Write operation—creating or modifying candidate data reversibly.

From the tool's definition Tool name 'update_candidate_phone' indicates modification of candidate contact information. The sibling tools show a pattern of data modification operations (attach_*_tags, change_*_thumbnail, authorize_*).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_candidate_phone Rate-limited

update_candidate_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_candidate_phone": {
      "limits": [
        {
          "counter": "update_candidate_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_candidate_phone

What does the update_candidate_phone tool do? +

update_candidate_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_candidate_phone? +

Register the CATS MCP Server MCP server in PolicyLayer and add a rule for update_candidate_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_candidate_phone? +

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

Can I rate-limit update_candidate_phone? +

Yes. Add a rate_limit block to the update_candidate_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_candidate_phone completely? +

Set action: deny in the PolicyLayer policy for update_candidate_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_candidate_phone? +

update_candidate_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.