create_forwarding_address · Gmail MCP Server MCP

WHAT IT DOES

What create_forwarding_address does on Gmail MCP Server

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

WHY IT NEEDS A POLICY

Why create_forwarding_address needs a policy

Creating a forwarding address modifies account settings by adding a new email forwarding configuration. While reversible (categorizing it as Write rather than Destructive), this carries high severity because an attacker could forward all incoming emails to an external address, enabling account takeover, credential harvesting, or unauthorized access to sensitive communications.

From the tool's definition Tool name 'create_forwarding_address' and description 'Creates a forwarding address' indicate a modification operation that adds a new forwarding rule to the Gmail account.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_forwarding_address Rate-limited

create_forwarding_address 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_forwarding_address": {
      "limits": [
        {
          "counter": "create_forwarding_address_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about create_forwarding_address

What does the create_forwarding_address tool do? +

Creates a forwarding address. It is categorised as a Write tool in the Gmail 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_forwarding_address? +

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

What risk level is create_forwarding_address? +

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

Can I rate-limit create_forwarding_address? +

Yes. Add a rate_limit block to the create_forwarding_address 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_forwarding_address completely? +

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

create_forwarding_address is provided by the Gmail MCP Server MCP server (nk900600/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.