color_set_rgb · Open Brush MCP Server MCP: Risk & Policy

WHAT IT DOES

What color_set_rgb does on Open Brush MCP Server

AI agents use color_set_rgb 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 color_set_rgb needs a policy

The tool modifies (sets) a color parameter in the Open Brush painting software. This is a Write operation because it creates or modifies data reversibly—color settings can be changed back or undone. It has no destructive, financial, or code execution implications. The blast radius is minimal since it only affects the current drawing's color palette, with trivial impact if an AI agent misuses it.

From the tool's definition Tool name 'color_set_rgb' and description 'Sets color in RGB (0-1)' indicate modification of color state in Open Brush, a 3D painting application. This is a reversible change to application settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

color_set_rgb Rate-limited

color_set_rgb 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": {
    "color_set_rgb": {
      "limits": [
        {
          "counter": "color_set_rgb_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 color_set_rgb

What does the color_set_rgb tool do? +

Sets color in RGB (0-1). 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 color_set_rgb? +

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

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

Can I rate-limit color_set_rgb? +

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

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

color_set_rgb 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.