create_workbook

Create new Excel workbook.

SERVERCowork Bench SOURCE0717376/cowork_bench

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cowork-bench/create-workbook.md

WHAT IT DOES

What create_workbook does on Cowork Bench

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

RISK

Why create_workbook is rated Medium

This tool creates a new workbook, which is a reversible write operation. It generates new data structure without permanent destruction. Severity is medium because creating files could consume resources or overwrite existing files if naming conflicts occur, but the primary operation is additive rather than destructive. The tool does not execute arbitrary code, delete data, or move money.

From the tool's definition Tool name 'create_workbook' and description 'Create new Excel workbook' indicate creation of a new file/document artifact.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_workbook safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Cowork Bench, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_workbook, this is the rule to start with:

create_workbook Rate-limited

create_workbook 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_workbook": {
      "limits": [
        {
          "counter": "create_workbook_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Cowork Bench, apply this rule, and every create_workbook call is checked against it from then on.

FAQ

Questions about create_workbook

What does the create_workbook tool do? +

Create new Excel workbook. It is categorised as a Write tool in the Cowork Bench 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_workbook? +

Register the Cowork Bench MCP server in PolicyLayer and add a rule for create_workbook: 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 Cowork Bench. Nothing to install.

What risk level is create_workbook? +

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

Can I rate-limit create_workbook? +

Yes. Add a rate_limit block to the create_workbook 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_workbook completely? +

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

create_workbook is provided by the Cowork Bench MCP server (0717376/cowork_bench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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