Lists all defined tables (named ranges or header-based logical tables) within a sheet or spreadsheet.
AI agents call list_tables to retrieve information from Google Sheets MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about existing tables within a spreadsheet without altering any data or structure. It is purely informational and has no side effects, making it a Read operation with low risk.
From the tool's definition Tool name 'list_tables' and description 'Lists all defined tables' indicate a query/retrieval operation with no modification, creation, or deletion of data.
Attacks that exploit this kind of access
Lists all defined tables (named ranges or header-based logical tables) within a sheet or spreadsheet. It is categorised as a Read tool in the Google Sheets MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Sheets MCP Server MCP server in PolicyLayer and add a rule for list_tables: 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 Server. Nothing to install.
list_tables 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_tables 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_tables. 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_tables is provided by the Google Sheets MCP Server MCP server (santiagopereda/mcp_googlesheets). 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.
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