updateGmailDraft · Google Workspace MCP Server MCP

WHAT IT DOES

What updateGmailDraft does on Google Workspace MCP Server

AI agents use updateGmailDraft 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 updateGmailDraft needs a policy

This tool creates or modifies data reversibly. Updating a draft email is a write operation—changes can be undone by reverting the draft or deleting it. The blast radius is medium because an agent could modify drafts to send phishing emails, inject malicious links, or alter sensitive communications, but the modifications remain in draft state until sent (not automatically sent), providing some safeguard.

From the tool's definition Tool name 'updateGmailDraft' and description explicitly states it 'Update[s] an existing Gmail draft' by modifying 'to, cc, bcc, subject, body, or attachments', with ability to replace existing attachments.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

updateGmailDraft Rate-limited

updateGmailDraft 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": {
    "updateGmailDraft": {
      "limits": [
        {
          "counter": "updategmaildraft_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 updateGmailDraft

What does the updateGmailDraft tool do? +

Update an existing Gmail draft. You can update any combination of to, cc, bcc, subject, body, or attachments. Fields not provided will keep their current values (except attachments which replace existing ones if provided). 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 updateGmailDraft? +

Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for updateGmailDraft: 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 updateGmailDraft? +

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

Can I rate-limit updateGmailDraft? +

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

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

updateGmailDraft 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.