Reads data from a specified range in a Google Sheet.
AI agents call read_cells to retrieve information from Mcp Gsheet without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from Google Sheets without altering any state. It performs a simple query operation on a cell range, which is characteristic of Read category tools. The low severity reflects minimal blast radius if misused—an AI agent could read sensitive data it shouldn't access, but cannot modify, delete, or execute operations.
From the tool's definition Tool name 'read_cells' and description 'Reads data from a specified range in a Google Sheet' indicate pure data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Reads data from a specified range in a Google Sheet. It is categorised as a Read tool in the Mcp Gsheet MCP Server, which means it retrieves data without modifying state.
Register the Mcp Gsheet MCP server in PolicyLayer and add a rule for read_cells: 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 Mcp Gsheet. Nothing to install.
read_cells 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_cells 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_cells. 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_cells is provided by the Mcp Gsheet MCP server (shionhonda/mcp-gsheet). 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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