update_email_draft · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_email_draft does on Gmail MCP Server

AI agents use update_email_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 update_email_draft needs a policy

This tool modifies email draft content reversibly without deleting data or sending emails. It falls into the Write category as it creates or modifies data reversibly. Severity is medium because misuse could modify draft contents intended for sensitive communications, but the impact is limited to unsent drafts and remains undoable until the email is sent.

From the tool's definition Tool name 'update_email_draft' and description 'Update an existing email draft with new details' indicate modification of existing data. Drafts are reversible (can be edited again or discarded before sending).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_email_draft Rate-limited

update_email_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": {
    "update_email_draft": {
      "limits": [
        {
          "counter": "update_email_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 update_email_draft

What does the update_email_draft tool do? +

Update an existing email draft with new details. 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 update_email_draft? +

Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for update_email_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 update_email_draft? +

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

Can I rate-limit update_email_draft? +

Yes. Add a rate_limit block to the update_email_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 update_email_draft completely? +

Set action: deny in the PolicyLayer policy for update_email_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 update_email_draft? +

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