run_script_function_tool

THE RISK

High Risk

Why run_script_function_tool needs a policy

This tool triggers execution of arbitrary Google Apps Script functions. Apps Script functions can perform a wide range of side effects including I/O operations, API calls, data manipulation, and external integrations. Without visibility into what specific functions are being executed, a malicious agent could exploit this to run harmful code.

From the tool's definition Tool name 'run_script_function_tool' and server description indicating 'function execution' and ability to 'execute Google Apps Script projects'. The empty description cannot negate the clear execution semantics.

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

POLICY

How to control run_script_function_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 run_script_function_tool:

policy.json

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

run_script_function_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

Destructive delete_deployment_tool Delete a deployment. Destructive delete_drive_file_tool Permanently delete a file from Google Drive. Destructive delete_event_tool Delete a calendar event. Destructive delete_script_project_tool Delete an Apps Script project. Destructive delete_task_tool Delete a task from Google Tasks. Destructive remove_drive_permission_tool Remove a permission from a file or folder. Destructive trash_drive_file_tool Move a file to trash in Google Drive (recoverable). Execute start_google_auth_tool Start Google OAuth authentication flow.

All 60 Apps Script MCP tools →

Execute tools on other servers

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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 run_script_function_tool

What does the run_script_function_tool tool do? +

run_script_function_tool. 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 run_script_function_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for run_script_function_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 run_script_function_tool? +

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

Can I rate-limit run_script_function_tool? +

Yes. Add a rate_limit block to the run_script_function_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 run_script_function_tool completely? +

Set action: deny in the PolicyLayer policy for run_script_function_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 run_script_function_tool? +

run_script_function_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 →