create_tag · Zimbra MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_tag does on Zimbra MCP Server

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

WHY IT NEEDS A POLICY

Why create_tag needs a policy

This tool creates a new metadata tag in Zimbra, which is a reversible data modification (tags can be deleted or modified later). It has no side effects beyond adding a new tag to the system, affecting only the user's organizational structure. The blast radius is minimal—a mistaken tag creation causes no data loss and is easily undone. This is a classic Write category operation.

From the tool's definition Tool name 'create_tag' and description 'Create a new tag' indicate a creation operation that modifies email/contact organization state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_tag Rate-limited

create_tag 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_tag": {
      "limits": [
        {
          "counter": "create_tag_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 Zimbra MCP Server, so you can run agents against it safely.

FAQ

Questions about create_tag

What does the create_tag tool do? +

Create a new tag. It is categorised as a Write tool in the Zimbra 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 create_tag? +

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

What risk level is create_tag? +

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

Can I rate-limit create_tag? +

Yes. Add a rate_limit block to the create_tag 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_tag completely? +

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

create_tag is provided by the Zimbra MCP Server MCP server (jeremie-lesage/zimbra-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.