Appends rows of data to the end of a sheet in a Google Spreadsheet
AI agents use appendSpreadsheetRows to create or update resources in Google Drive MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Drive MCP Server environment.
Appending rows is a Write operation: it creates new data in the spreadsheet in a reversible manner (rows can be deleted later). It does not execute arbitrary code, delete data irreversibly, or move money. The severity is medium because misuse could add large volumes of unwanted data to shared documents, affecting multiple users and potentially corrupting workflows, but the action remains undoable.
From the tool's definition Tool description states it 'Appends rows of data to the end of a sheet' — this is a create/modify operation that adds data reversibly to a spreadsheet.
Documented attack patterns abuse exactly the kind of access appendSpreadsheetRows 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 appendSpreadsheetRows:
{
"version": "1",
"default": "deny",
"tools": {
"appendSpreadsheetRows": {
"limits": [
{
"counter": "appendspreadsheetrows_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}appendSpreadsheetRows stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Appends rows of data to the end of a sheet in a Google Spreadsheet. It is categorised as a Write tool in the Google Drive MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Drive MCP Server MCP server in PolicyLayer and add a rule for appendSpreadsheetRows: 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.
appendSpreadsheetRows is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the appendSpreadsheetRows 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 appendSpreadsheetRows. 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.
appendSpreadsheetRows 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.
Free to start. No card required.
107 Google Drive MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.