AI agents call read_columns to retrieve information from Google Sheets MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation on Google Sheets data. It retrieves column data without creating, modifying, or deleting any information. The absence of mutation or external execution makes this a Read category tool with low severity—misuse would only expose data already accessible to the authenticated user.
From the tool's definition Tool name 'read_columns' and description 'Read columns from a Google Sheet' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access read_columns gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Sheets MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for read_columns:
{
"version": "1",
"default": "deny",
"tools": {
"read_columns": {}
}
}read_columns is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read columns from a Google Sheet. It is categorised as a Read tool in the Google Sheets MCP MCP Server, which means it retrieves data without modifying state.
Register the Google Sheets MCP server in PolicyLayer and add a rule for read_columns: 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 Sheets MCP. Nothing to install.
read_columns 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 read_columns 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 read_columns. 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.
read_columns is provided by the Google Sheets MCP server (mkummer225/google-sheets-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google Sheets 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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15 Google Sheets MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.