sheets_append_values

ServerGoogle Workspace
CategoryWrite

WHAT IT DOES

What sheets_append_values does on Google Workspace

AI agents use sheets_append_values to create or update resources in Google Workspace — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Workspace environment.

THE RISK

Medium Risk

Why sheets_append_values needs a policy

This tool adds new rows to an existing spreadsheet table. It creates/modifies data but is reversible (rows can be deleted). No code execution, deletion, or financial operations are involved.

From the tool's definition Append rows of data to the end of a table in a Google Spreadsheet

Documented attack patterns abuse exactly the kind of access sheets_append_values gives an agent:

POLICY

How to control sheets_append_values

PolicyLayer is an MCP gateway — it sits between your AI agents and Google Workspace, and nothing reaches the server without passing your rules. This is the rule we recommend for sheets_append_values:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sheets_append_values": {
      "limits": [
        {
          "counter": "sheets_append_values_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

sheets_append_values 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.

Create a free account and register Google Workspace — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Google Workspace tools

Destructive drive_delete_comment Delete a comment from a Google Doc. Args: - file_id (string): The ID of the Google Doc Destructive sheets_clear_values Clear cell values from a specific range in a Google Spreadsheet (keeps formatting). Args: Write docs_batch_update Apply batch updates to a Google Doc (insert/update/delete text, formatting, images, tables Write docs_create_document Create a new Google Doc with an optional initial body. Args: - title (string): The titl Write sheets_duplicate_sheet Duplicate a sheet within the same spreadsheet. Args: - spreadsheet_id (string): The ID Write drive_copy_file Create a copy of a file in Google Drive. Args: - file_id (string): The ID of the file t Write drive_create_comment Add a comment to a Google Doc. Can be anchored to specific text or unanchored. Args: - Write drive_reply_to_comment Reply to an existing comment on a Google Doc. Args: - file_id (string): The ID of the G

All 34 Google Workspace tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sheets_append_values

What does the sheets_append_values tool do? +

Append rows of data to the end of a table in a Google Spreadsheet. Args: - spreadsheet_id (string): The ID of the Google Spreadsheet - range (string): The A1 notation range defining the table to append to (e.g.,. It is categorised as a Write tool in the Google Workspace MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sheets_append_values? +

Register the Google Workspace MCP server in PolicyLayer and add a rule for sheets_append_values: 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 Workspace. Nothing to install.

What risk level is sheets_append_values? +

sheets_append_values is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sheets_append_values? +

Yes. Add a rate_limit block to the sheets_append_values 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.

How do I block sheets_append_values completely? +

Set action: deny in the PolicyLayer policy for sheets_append_values. 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.

What MCP server provides sheets_append_values? +

sheets_append_values is provided by the Google Workspace MCP server (everyinc/google-workspace-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Workspace tool call.

Start from Google Workspace, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

34 Google Workspace tools catalogued and risk-classified — across an index of 43,000+ MCP servers.