categorize_emails · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What categorize_emails does on Gmail MCP Server

AI agents use categorize_emails 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 categorize_emails needs a policy

Categorizing/labeling an email modifies its metadata or labels in Gmail, which is a reversible write operation. It does not delete data or execute code, but it does change the state of the email record. Confidence is moderate because the description doesn't explicitly state how categorization is implemented (e.g., applying labels vs.

From the tool's definition Categorize an email into high, medium, or low priority

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

categorize_emails Rate-limited

categorize_emails 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": {
    "categorize_emails": {
      "limits": [
        {
          "counter": "categorize_emails_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 categorize_emails

What does the categorize_emails tool do? +

Categorize an email into high, medium, or low priority. 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 categorize_emails? +

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

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

Can I rate-limit categorize_emails? +

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

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

categorize_emails is provided by the Gmail MCP Server MCP server (kushal45/gmailmcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.