replace_contact_tags · CATS MCP Server MCP: Risk & Policy

WHAT IT DOES

What replace_contact_tags does on CATS MCP Server

AI agents use replace_contact_tags 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 replace_contact_tags needs a policy

This tool modifies contact metadata by replacing tags, which is a reversible write operation. While it overwrites existing tags, the operation is not destructive (tags can be replaced again), and there is no permanent deletion or irreversible data loss. The blast radius is limited to contact tag metadata, making it medium severity. It does not execute code, delete data irreversibly, or involve financial transactions.

From the tool's definition Tool description states 'Replace all tags on a contact (replaces existing tags)' - this is a modification operation that overwrites existing tags with new ones.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

replace_contact_tags Rate-limited

replace_contact_tags 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": {
    "replace_contact_tags": {
      "limits": [
        {
          "counter": "replace_contact_tags_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 replace_contact_tags

What does the replace_contact_tags tool do? +

Replace all tags on a contact (replaces existing tags). 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 replace_contact_tags? +

Register the CATS MCP Server MCP server in PolicyLayer and add a rule for replace_contact_tags: 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 replace_contact_tags? +

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

Can I rate-limit replace_contact_tags? +

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

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

replace_contact_tags 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.