update_script_content_tool

THE RISK

Medium Risk

Why update_script_content_tool needs a policy

The tool name implies it updates/overwrites script source code, which is a Write operation. However, modifying script content could have serious downstream effects if the script is executed afterward — potentially enabling Execute or Destructive actions. Severity is rated high due to the blast radius of replacing script code.

From the tool's definition Tool name: update_script_content_tool — 'update' suggests modifying existing data; 'script_content' suggests it modifies code in a Google Apps Script project.

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

POLICY

How to control update_script_content_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 update_script_content_tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_script_content_tool": {
      "limits": [
        {
          "counter": "update_script_content_tool_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

update_script_content_tool 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.

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.

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 run_script_function_tool run_script_function_tool

All 60 Apps Script MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_script_content_tool

What does the update_script_content_tool tool do? +

update_script_content_tool. It is categorised as a Write tool in the Apps Script MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_script_content_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for update_script_content_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 update_script_content_tool? +

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

Can I rate-limit update_script_content_tool? +

Yes. Add a rate_limit block to the update_script_content_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 update_script_content_tool completely? +

Set action: deny in the PolicyLayer policy for update_script_content_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 update_script_content_tool? +

update_script_content_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 →