update_pop · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_pop does on Gmail MCP Server

AI agents use update_pop 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_pop needs a policy

This tool modifies email account configuration settings reversibly. While not creating new messages or permanently deleting data, changing POP settings affects email delivery and access mechanisms. The impact is reversible (settings can be changed back), placing it in Write rather than Execute or Destructive.

From the tool's definition Tool name 'update_pop' and description 'Updates POP settings' indicate modification of email account configuration. POP (Post Office Protocol) settings control email retrieval behavior.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_pop Rate-limited

update_pop 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_pop": {
      "limits": [
        {
          "counter": "update_pop_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_pop

What does the update_pop tool do? +

Updates POP settings. 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_pop? +

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

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

Can I rate-limit update_pop? +

Yes. Add a rate_limit block to the update_pop 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_pop completely? +

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

update_pop is provided by the Gmail MCP Server MCP server (nk900600/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.