start_google_auth_tool

THE RISK

High Risk

Why start_google_auth_tool needs a policy

This tool executes an external OAuth flow rather than simply reading or writing static data. While not destructive or financial, it initiates a stateful interaction with Google's authentication system that could grant permissions or establish credentials. The authentication outcome determines subsequent access levels, making it an Execute-category tool.

From the tool's definition 'Start Google OAuth authentication flow' — initiates an external authentication process that triggers a sequence of operations (OAuth handshake, token generation, permission grants) whose effects depend on user and authorization server behavior.

Documented attack patterns abuse exactly the kind of access start_google_auth_tool gives an agent:

POLICY

How to control start_google_auth_tool

PolicyLayer is an MCP gateway — it sits between your AI agents and Apps Script MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for start_google_auth_tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "start_google_auth_tool": {
      "limits": [
        {
          "counter": "start_google_auth_tool_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

start_google_auth_tool stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Apps Script MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Apps Script MCP tools

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All 60 Apps Script MCP tools →

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Go deeper

High-risk tools in Apps Script MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about start_google_auth_tool

What does the start_google_auth_tool tool do? +

Start Google OAuth authentication flow. It is categorised as a Execute tool in the Apps Script MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_google_auth_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for start_google_auth_tool: 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 Apps Script MCP. Nothing to install.

What risk level is start_google_auth_tool? +

start_google_auth_tool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit start_google_auth_tool? +

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

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

start_google_auth_tool is provided by the Apps Script MCP server (sam-ent/google-automation-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Apps Script MCP tool call.

Start from Apps Script MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →