gmail_users_messages_modify

Modify labels on a message

SERVERGoogle Workspace Gmail (gws CLI) SOURCE@gws mcp -s gmail

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/google-workspace-gmail/gmail-users-messages-modify.md

WHAT IT DOES

What gmail_users_messages_modify does on Google Workspace Gmail (gws CLI)

AI agents use gmail_users_messages_modify to create or update resources in Google Workspace Gmail (gws CLI), usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Workspace Gmail (gws CLI) environment.

RISK

Why gmail_users_messages_modify is rated Medium

Modifying labels is a write operation that changes message state (organization, categorization) but is reversible—labels can be added or removed without data loss. It does not execute code, delete messages, move money, or trigger external operations.

From the tool's definition Tool name `gmail_users_messages_modify` and description states it "Modify labels on a message" — this creates or modifies message metadata (labels/tags) reversibly without deleting content.

Risk signalsChanges message organisation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gmail_users_messages_modify safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Google Workspace Gmail (gws CLI), and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For gmail_users_messages_modify, this is the rule to start with:

gmail_users_messages_modify Rate-limited

gmail_users_messages_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_users_messages_modify": {
      "limits": [
        {
          "counter": "gmail_users_messages_modify_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Google Workspace Gmail (gws CLI), apply this rule, and every gmail_users_messages_modify call is checked against it from then on.

FAQ

Questions about gmail_users_messages_modify

What does the gmail_users_messages_modify tool do? +

Modify labels on a message. It is categorised as a Write tool in the Google Workspace Gmail (gws CLI) 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_users_messages_modify? +

Register the Google Workspace Gmail (gws CLI) MCP server in PolicyLayer and add a rule for gmail_users_messages_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 Google Workspace Gmail (gws CLI). Nothing to install.

What risk level is gmail_users_messages_modify? +

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

Can I rate-limit gmail_users_messages_modify? +

Yes. Add a rate_limit block to the gmail_users_messages_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_users_messages_modify completely? +

Set action: deny in the PolicyLayer policy for gmail_users_messages_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_users_messages_modify? +

gmail_users_messages_modify is provided by the Google Workspace Gmail (gws CLI) MCP server (@gws mcp -s gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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