createGmailFilter · Google Workspace MCP Server MCP

WHAT IT DOES

What createGmailFilter does on Google Workspace MCP Server

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

WHY IT NEEDS A POLICY

Why createGmailFilter needs a policy

This tool creates persistent email processing rules that modify how incoming messages are handled. While these changes are reversible (unlike deletion), they constitute write operations that alter the state of Gmail accounts and email behavior.

From the tool's definition Tool name 'createGmailFilter' and description states it can 'add/remove labels, forward messages, or archive them' — these are modifications to email handling and organization that are reversible (labels can be removed, forwarding can be disabled, archived…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createGmailFilter Rate-limited

createGmailFilter 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": {
    "createGmailFilter": {
      "limits": [
        {
          "counter": "creategmailfilter_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 Google Workspace MCP Server, so you can run agents against it safely.

FAQ

Questions about createGmailFilter

What does the createGmailFilter tool do? +

Create a Gmail filter to automatically process incoming messages. Filters can add/remove labels, forward messages, or archive them. It is categorised as a Write tool in the Google Workspace 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 createGmailFilter? +

Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for createGmailFilter: 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 Google Workspace MCP Server. Nothing to install.

What risk level is createGmailFilter? +

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

Can I rate-limit createGmailFilter? +

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

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

createGmailFilter is provided by the Google Workspace MCP Server MCP server (pm990320/google-workspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.