guide_position · Open Brush MCP Server MCP: Risk & Policy

WHAT IT DOES

What guide_position does on Open Brush MCP Server

AI agents use guide_position 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 guide_position needs a policy

This tool modifies the position of a guide object within the Open Brush 3D painting software, which is a reversible data change operation. It does not create or delete guides, nor execute arbitrary code—it simply updates guide placement coordinates.

From the tool's definition Tool name 'guide_position' with description 'Moves a guide to given coordinates' indicates modification of guide object state through coordinate parameters.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

guide_position Rate-limited

guide_position 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": {
    "guide_position": {
      "limits": [
        {
          "counter": "guide_position_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 guide_position

What does the guide_position tool do? +

Moves a guide to given coordinates. 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 guide_position? +

Register the Open Brush MCP Server MCP server in PolicyLayer and add a rule for guide_position: 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 guide_position? +

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

Can I rate-limit guide_position? +

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

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

guide_position 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.