send_draft · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_draft does on Gmail MCP Server

AI agents use send_draft 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 send_draft needs a policy

Sending a draft irreversibly transmits an email message, constituting a Write action (creates/modifies data state). Severity is high because misuse could result in sending unintended messages to wrong recipients, leaking sensitive information, or impersonating the account holder.

From the tool's definition Tool description states 'Send an existing draft' which transmits a message via Gmail API. The sibling tools context (create_draft, send_email capability via drafts) confirms this is a message transmission action that modifies email state by converting draft…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_draft Rate-limited

send_draft 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": {
    "send_draft": {
      "limits": [
        {
          "counter": "send_draft_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 send_draft

What does the send_draft tool do? +

Send an existing draft. 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 send_draft? +

Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for send_draft: 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 send_draft? +

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

Can I rate-limit send_draft? +

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

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

send_draft 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.