verify_send_as

THE RISK

High Risk

This tool triggers an external operation (sending a verification email) to a specified alias. It doesn't just read or write data locally — it actively dispatches an email to an external address, which is an external operation with real-world side effects. It's not Destructive or Financial, but it does execute an outbound email action.

From the tool's definition Sends a verification email to the specified send-as alias

Documented attack patterns abuse exactly the kind of access verify_send_as gives an agent:

HOW TO CONTROL VERIFY_SEND_AS

PolicyLayer is an MCP gateway — it sits between your AI agents and Gmail MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for verify_send_as:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "verify_send_as": {
      "limits": [
        {
          "counter": "verify_send_as_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

verify_send_as stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Gmail MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Gmail MCP tools

Destructive batch_delete_messages Delete multiple messages Destructive delete_draft Delete a draft Destructive delete_filter Deletes a filter Destructive delete_forwarding_address Deletes the specified forwarding address Destructive delete_label Delete a label Destructive delete_message Immediately and permanently delete a message Destructive delete_send_as Deletes the specified send-as alias Destructive delete_smime_info Deletes the specified S/MIME config for the specified send-as alias

All 65 Gmail MCP tools →

Execute tools on other servers

Frida Game Hacking MCP remove_breakpoint Procmon request_elevation WireMCP capture_packets Pentest Ai run_probe

Go deeper

High-risk tools in Gmail MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the verify_send_as tool do? +

Sends a verification email to the specified send-as alias. It is categorised as a Execute tool in the Gmail MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on verify_send_as? +

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

What risk level is verify_send_as? +

verify_send_as is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit verify_send_as? +

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

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

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

Enforce policy on every Gmail MCP tool call.

Deterministic rules across all 65 Gmail MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN GMAIL →

Free to start. No card required.

65 Gmail MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT VERIFY_SEND_AS ON GMAIL MCP DOES

// THE RISK

// HOW TO CONTROL VERIFY_SEND_AS

// EXPLORE