canvas_hide

Hide the canvas window without closing the session

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-hide.md

WHAT IT DOES

What canvas_hide does on CoWork OS

AI agents use canvas_hide 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_hide is rated Medium

This tool modifies the visibility state of a UI element (the canvas window) without destroying it. It is reversible (the window can be shown again), so it falls under Write rather than Destructive. The blast radius is low since it only affects UI state.

From the tool's definition 'Hide the canvas window without closing the session'

Attacks that exploit this kind of access

RECOMMENDED RULE

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

canvas_hide Rate-limited

canvas_hide 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_hide": {
      "limits": [
        {
          "counter": "canvas_hide_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_hide call is checked against it from then on.

FAQ

Questions about canvas_hide

What does the canvas_hide tool do? +

Hide the canvas window without closing the session. 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_hide? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for canvas_hide: 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_hide? +

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

Can I rate-limit canvas_hide? +

Yes. Add a rate_limit block to the canvas_hide 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_hide completely? +

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

canvas_hide 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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