gmail_batch_modify · Vibe MCP: Risk & Policy

WHAT IT DOES

What gmail_batch_modify does on VibeMCP

AI agents use gmail_batch_modify to create or update resources in VibeMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VibeMCP environment.

WHY IT NEEDS A POLICY

Why gmail_batch_modify needs a policy

An AI agent can call gmail_batch_modify faster than any human can review — one bad instruction and it creates or modifies resources in VibeMCP by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gmail_batch_modify Rate-limited

gmail_batch_modify 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": {
    "gmail_batch_modify": {
      "limits": [
        {
          "counter": "gmail_batch_modify_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 VibeMCP, so you can run agents against it safely.

FAQ

Questions about gmail_batch_modify

What does the gmail_batch_modify tool do? +

Batch modify Gmail messages: archive, mark read/unread, trash, or untrash up to 1000 messages at once. It is categorised as a Write tool in the VibeMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gmail_batch_modify? +

Register the Vibe MCP server in PolicyLayer and add a rule for gmail_batch_modify: 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 VibeMCP. Nothing to install.

What risk level is gmail_batch_modify? +

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

Can I rate-limit gmail_batch_modify? +

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

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

gmail_batch_modify is provided by the Vibe MCP server (vibetensor/vibemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.