sheets_update_chart · Mcp Gsheets MCP: Risk & Policy

WHAT IT DOES

What sheets_update_chart does on Mcp Gsheets

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

WHY IT NEEDS A POLICY

Why sheets_update_chart needs a policy

This tool modifies an existing chart configuration, which is a reversible change to spreadsheet structure. It does not execute arbitrary code, delete data, nor move money. It falls squarely into the Write category as it creates or modifies data reversibly.

From the tool's definition Tool name 'sheets_update_chart' and description 'Update an existing chart in a Google Sheets spreadsheet' indicate modification of existing data/objects without deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sheets_update_chart Rate-limited

sheets_update_chart 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Gsheets, so you can run agents against it safely.

FAQ

Questions about sheets_update_chart

What does the sheets_update_chart tool do? +

Update an existing chart in a Google Sheets spreadsheet. It is categorised as a Write tool in the Mcp Gsheets 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_update_chart? +

Register the Mcp Gsheets MCP server in PolicyLayer and add a rule for sheets_update_chart: 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 Gsheets. Nothing to install.

What risk level is sheets_update_chart? +

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

Can I rate-limit sheets_update_chart? +

Yes. Add a rate_limit block to the sheets_update_chart 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_update_chart completely? +

Set action: deny in the PolicyLayer policy for sheets_update_chart. 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_update_chart? +

sheets_update_chart is provided by the Mcp Gsheets MCP server (mcp-gsheets). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.