canvas_create_user

Create a new user in an account

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/canvas-create-user.md

WHAT IT DOES

What canvas_create_user does on Cowork Bench

AI agents use canvas_create_user 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 canvas_create_user is rated Medium

This tool creates a new user account, which is a reversible write operation that modifies account state. However, severity is elevated to 'high' due to the account-level implications: unauthorized user creation could compromise access controls, enable unauthorized access to shared resources, or create audit/compliance issues.

From the tool's definition Tool name 'canvas_create_user' and description 'Create a new user in an account' explicitly indicate creation of a new account resource.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

canvas_create_user Rate-limited

canvas_create_user 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": {
    "canvas_create_user": {
      "limits": [
        {
          "counter": "canvas_create_user_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 canvas_create_user call is checked against it from then on.

FAQ

Questions about canvas_create_user

What does the canvas_create_user tool do? +

Create a new user in an account. 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 canvas_create_user? +

Register the Cowork Bench MCP server in PolicyLayer and add a rule for canvas_create_user: 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 canvas_create_user? +

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

Can I rate-limit canvas_create_user? +

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

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

canvas_create_user 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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