batch_apply_label · Gmail MCP Server MCP: Risk & Policy

WHAT IT DOES

What batch_apply_label does on Gmail MCP Server

AI agents use batch_apply_label 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 batch_apply_label needs a policy

This tool modifies email metadata (labels/tags) in bulk, which is a reversible write operation. It does not delete data (would be Destructive), send emails (would be Execute), or move money (would be Financial). Bulk label application could affect email organization and filtering for many messages, warranting medium severity.

From the tool's definition Tool name 'batch_apply_label' and sibling tools 'create_email_label', 'delete_email_label', and 'get_email_labels' indicate this modifies email organization state. The prefix 'batch_' suggests bulk operations on multiple emails.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

batch_apply_label Rate-limited

batch_apply_label 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": {
    "batch_apply_label": {
      "limits": [
        {
          "counter": "batch_apply_label_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 batch_apply_label

What does the batch_apply_label tool do? +

batch_apply_label. 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 batch_apply_label? +

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

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

Can I rate-limit batch_apply_label? +

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

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

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