gmail.updateDraft · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What gmail.updateDraft does on Gmail MCP Server

AI agents use gmail.updateDraft 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 gmail.updateDraft needs a policy

This tool creates or modifies data in a reversible manner, fitting the Write category. Severity is medium because misuse could lead to unauthorized modifications of draft emails (potentially exposing sensitive content if drafts are overwritten with malicious text, or if an agent were to modify drafts belonging to other users), but the impact is limited to unsent drafts rather than sent emails or account-level…

From the tool's definition Tool name is 'updateDraft' and description states 'Update an existing draft.' The action modifies existing data (a draft email) reversibly—drafts can be further edited or deleted.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gmail.updateDraft Rate-limited

gmail.updateDraft 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": {
    "gmail.updateDraft": {
      "limits": [
        {
          "counter": "gmail.updatedraft_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 gmail.updateDraft

What does the gmail.updateDraft tool do? +

Update an existing draft. Requires gmail.compose scope. 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 gmail.updateDraft? +

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

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

Can I rate-limit gmail.updateDraft? +

Yes. Add a rate_limit block to the gmail.updateDraft 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 gmail.updateDraft completely? +

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

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