create_pivot_table · Excel MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_pivot_table does on Excel MCP Server

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

WHY IT NEEDS A POLICY

Why create_pivot_table needs a policy

Creating a pivot table is a Write operation because it constructs and inserts new data structures (a new sheet with aggregated data) into the workbook. This is reversible (sheets can be deleted via delete_sheet), distinguishing it from Destructive. It does not execute arbitrary code or trigger external operations, so it is not Execute.

From the tool's definition Tool creates a new sheet with aggregated results, which modifies the workbook structure and introduces new data artifacts. The description explicitly states it 'creates a new sheet,' which is a reversible data modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_pivot_table Rate-limited

create_pivot_table 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": {
    "create_pivot_table": {
      "limits": [
        {
          "counter": "create_pivot_table_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about create_pivot_table

What does the create_pivot_table tool do? +

Create a pivot table from source data. Creates a new sheet with the aggregated results. It is categorised as a Write tool in the Excel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_pivot_table? +

Register the Excel MCP Server MCP server in PolicyLayer and add a rule for create_pivot_table: 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 Excel MCP Server. Nothing to install.

What risk level is create_pivot_table? +

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

Can I rate-limit create_pivot_table? +

Yes. Add a rate_limit block to the create_pivot_table 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 create_pivot_table completely? +

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

create_pivot_table is provided by the Excel MCP Server MCP server (jauinones/xlsx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.