get_or_create_label · Gmail MCP: Risk & Policy

WHAT IT DOES

What get_or_create_label does on Gmail

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

WHY IT NEEDS A POLICY

Why get_or_create_label needs a policy

This tool performs a read (get) or write (create) operation depending on whether the label exists. Since it may create a new label, the most severe applicable category is Write. Creating a label is a reversible operation (labels can be deleted), so it does not qualify as Destructive. Severity is medium because misuse could clutter or alter Gmail label organization, but the blast radius is limited.

From the tool's definition Gets an existing label by name or creates it if it doesn't exist

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

get_or_create_label Rate-limited

get_or_create_label 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": {
    "get_or_create_label": {
      "limits": [
        {
          "counter": "get_or_create_label_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 Gmail, so you can run agents against it safely.

FAQ

Questions about get_or_create_label

What does the get_or_create_label tool do? +

Gets an existing label by name or creates it if it doesn\. It is categorised as a Write tool in the Gmail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on get_or_create_label? +

Register the Gmail MCP server in PolicyLayer and add a rule for get_or_create_label: 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 Gmail. Nothing to install.

What risk level is get_or_create_label? +

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

Can I rate-limit get_or_create_label? +

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

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

get_or_create_label is provided by the Gmail MCP server (pouyanafisi/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.