layer_opacity · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What layer_opacity does on SVG Canvas MCP

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

WHY IT NEEDS A POLICY

Why layer_opacity needs a policy

This tool modifies layer opacity in an SVG canvas, which is a reversible write operation. It changes visual properties of design elements but does not delete, destroy, execute arbitrary code, move money, or perform irreversible actions. The change can be undone by setting a different opacity value.

From the tool's definition Tool name 'layer_opacity' and description indicating it 'sets the opacity of a layer' - a reversible modification of SVG layer properties without permanent data loss or side effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

layer_opacity Rate-limited

layer_opacity 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_opacity": {
      "limits": [
        {
          "counter": "layer_opacity_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 SVG Canvas MCP, so you can run agents against it safely.

FAQ

Questions about layer_opacity

What does the layer_opacity tool do? +

레이어의 불투명도를 설정합니다. It is categorised as a Write tool in the SVG Canvas MCP 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_opacity? +

Register the SVG Canvas MCP server in PolicyLayer and add a rule for layer_opacity: 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 SVG Canvas MCP. Nothing to install.

What risk level is layer_opacity? +

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

Can I rate-limit layer_opacity? +

Yes. Add a rate_limit block to the layer_opacity 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_opacity completely? +

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

layer_opacity is provided by the SVG Canvas MCP server (kim62210/svg-canvas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.