Read columns from a Google Sheet
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 retrieves column data from a spreadsheet with no destructive, write, or execute capabilities. It is purely informational and poses minimal risk even if called with arbitrary arguments, as it only exposes existing data the agent may already have access to.
From the tool's definition Tool name is 'read_columns' and description states 'Read columns from a Google Sheet'. The verb 'Read' and absence of modification language clearly indicate data retrieval without side effects.
Attacks that exploit this kind of access
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 (roelofvheeren/final-sheet-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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