insert_smime_info · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What insert_smime_info does on Gmail MCP Server

AI agents use insert_smime_info 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 insert_smime_info needs a policy

The tool creates or modifies S/MIME credentials/configuration for email signing purposes. While it changes system settings rather than deleting data, the operation is reversible (can be updated or removed later). This qualifies as Write rather than Execute because it stores configuration data rather than executing arbitrary code or commands.

From the tool's definition Tool name and description indicate 'Insert (upload)' action that modifies S/MIME configuration for a Gmail send-as alias. This is a create or modify operation on configuration data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_smime_info Rate-limited

insert_smime_info 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": {
    "insert_smime_info": {
      "limits": [
        {
          "counter": "insert_smime_info_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 insert_smime_info

What does the insert_smime_info tool do? +

Insert (upload) the given S/MIME config for the specified send-as alias. 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 insert_smime_info? +

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

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

Can I rate-limit insert_smime_info? +

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

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

insert_smime_info 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.