star_gmail_message · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What star_gmail_message does on Gmail MCP Server

AI agents use star_gmail_message 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 star_gmail_message needs a policy

Starring a Gmail message modifies email metadata reversibly without creating, deleting, or executing external operations. This is a Write operation with low severity since starred status can be easily undone and has minimal blast radius compared to deletion or financial operations.

From the tool's definition Tool name 'star_gmail_message' indicates a modification operation on email metadata. The server description states it provides 'access to Gmail, allowing Claude to search, read, send, and manage emails.' Sibling tools like 'mark_gmail_read',…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

star_gmail_message Rate-limited

star_gmail_message 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": {
    "star_gmail_message": {
      "limits": [
        {
          "counter": "star_gmail_message_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 star_gmail_message

What does the star_gmail_message tool do? +

star_gmail_message. 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 star_gmail_message? +

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

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

Can I rate-limit star_gmail_message? +

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

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

star_gmail_message is provided by the Gmail MCP Server MCP server (stevesimpson418/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.