create_chart

Create chart in worksheet.

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-chart.md

WHAT IT DOES

What create_chart does on Cowork Bench

AI agents use create_chart 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_chart is rated Medium

This tool creates a new chart object within a worksheet, which is a reversible modification operation. It does not execute arbitrary code, delete data, or move money. The blast radius is medium because a malformed or excessive number of chart creations could degrade worksheet performance or consume resources, but the action itself is reversible and does not permanently destroy information.

From the tool's definition Tool name is 'create_chart' and description states 'Create chart in worksheet' — uses verb 'Create' which indicates data/content creation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_chart 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_chart, this is the rule to start with:

create_chart Rate-limited

create_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": {
    "create_chart": {
      "limits": [
        {
          "counter": "create_chart_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_chart call is checked against it from then on.

FAQ

Questions about create_chart

What does the create_chart tool do? +

Create chart in worksheet. 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_chart? +

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

What risk level is create_chart? +

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

Can I rate-limit create_chart? +

Yes. Add a rate_limit block to the create_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 create_chart completely? +

Set action: deny in the PolicyLayer policy for create_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 create_chart? +

create_chart 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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