canvas_create

Create a new Live Canvas session for displaying interactive HTML/CSS/JS content.

SERVERCoWork OS SOURCECoWork-OS/CoWork-OS

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-os/canvas-create.md

WHAT IT DOES

What canvas_create does on CoWork OS

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

RISK

Why canvas_create is rated Medium

This tool creates new data structures (canvas sessions) and modifies application state reversibly. It does not execute arbitrary code on the system (Execute), delete anything (Destructive), handle financial transactions (Financial), or perform read-only operations (Read).

From the tool's definition The tool description states it will "Create a new Live Canvas session", which is a create operation that generates new interactive content sessions.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs canvas_create safely

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

canvas_create Rate-limited

canvas_create 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": {
      "limits": [
        {
          "counter": "canvas_create_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 OS, apply this rule, and every canvas_create call is checked against it from then on.

FAQ

Questions about canvas_create

What does the canvas_create tool do? +

Create a new Live Canvas session for displaying interactive HTML/CSS/JS content. It is categorised as a Write tool in the CoWork OS 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? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for canvas_create: 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 OS. Nothing to install.

What risk level is canvas_create? +

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

Can I rate-limit canvas_create? +

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

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

canvas_create is provided by the CoWork OS MCP server (CoWork-OS/CoWork-OS). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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