AI agents call list_deployments_tool to retrieve information from Apps Script MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays existing deployment metadata without modifying, deleting, or executing any code. It is purely informational, making it a Read category risk. Severity is low because exposure of deployment metadata poses minimal risk—deployments are typically already known to the project owner, and listing them does not alter state or execute arbitrary operations.
From the tool's definition Tool name is 'list_deployments_tool' and description states 'List all deployments for a script project.' The verb 'list' and action of retrieving/querying deployment information indicates a read-only retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_deployments_tool gives an agent:
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 list_deployments_tool:
{
"version": "1",
"default": "deny",
"tools": {
"list_deployments_tool": {}
}
}list_deployments_tool is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all deployments for a script project. It is categorised as a Read tool in the Apps Script MCP MCP Server, which means it retrieves data without modifying state.
Register the Apps Script MCP server in PolicyLayer and add a rule for list_deployments_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.
list_deployments_tool is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_deployments_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.
Set action: deny in the PolicyLayer policy for list_deployments_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.
list_deployments_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.
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.
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60 Apps Script MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.