AI agents call listComments to retrieve information from Google Drive MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and displays existing comments without altering, creating, or removing them. This is a pure read operation with minimal blast radius. Even if an AI agent calls it repeatedly, the only effect is retrieving data that already exists.
From the tool's definition Tool name is 'listComments' and description states 'List all comments in a Google Document' — this is a query/retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access listComments gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Drive MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listComments:
{
"version": "1",
"default": "deny",
"tools": {
"listComments": {}
}
}listComments 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 comments in a Google Document. It is categorised as a Read tool in the Google Drive MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Drive MCP Server MCP server in PolicyLayer and add a rule for listComments: 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 Drive MCP Server. Nothing to install.
listComments 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 listComments 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 listComments. 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.
listComments is provided by the Google Drive MCP Server MCP server (piotr-agier/google-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 107 Google Drive MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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107 Google Drive MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.