layer_hide · Open Brush MCP Server MCP: Risk & Policy

WHAT IT DOES

What layer_hide does on Open Brush MCP Server

AI agents use layer_hide to create or update resources in Open Brush MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Open Brush MCP Server environment.

WHY IT NEEDS A POLICY

Why layer_hide needs a policy

Hiding a layer modifies the visibility state of a layer, which is a Write operation (reversible state change). This is not a Read operation because it changes state, not a Destructive operation because hiding is reversible (layers can be unhidden), and not Execute because it doesn't run arbitrary code or trigger conditional external operations.

From the tool's definition Tool name 'layer_hide' and description 'Hides a layer' indicates a reversible modification operation on layer visibility state in Open Brush.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

layer_hide Rate-limited

layer_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": {
    "layer_hide": {
      "limits": [
        {
          "counter": "layer_hide_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Open Brush MCP Server, so you can run agents against it safely.

FAQ

Questions about layer_hide

What does the layer_hide tool do? +

Hides a layer. It is categorised as a Write tool in the Open Brush MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on layer_hide? +

Register the Open Brush MCP Server MCP server in PolicyLayer and add a rule for layer_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 Open Brush MCP Server. Nothing to install.

What risk level is layer_hide? +

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

Can I rate-limit layer_hide? +

Yes. Add a rate_limit block to the layer_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 layer_hide completely? +

Set action: deny in the PolicyLayer policy for layer_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 layer_hide? +

layer_hide is provided by the Open Brush MCP Server MCP server (moz411/openbrush-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.