svg_set_background · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What svg_set_background does on SVG Canvas MCP

AI agents use svg_set_background 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 svg_set_background needs a policy

This tool creates or modifies SVG graphic properties (background color) in a reversible manner. It does not execute code, delete data, move money, or perform irreversible changes. A misused call would only temporarily alter the visual appearance of a graphic, which can be easily undone by setting a different background color. The blast radius is minimal—confined to visual changes in the current SVG canvas.

From the tool's definition Tool name 'svg_set_background' and description indicating it 'sets canvas background color' (from Korean: '캔버스 배경색을 설정합니다'). This modifies a property of an SVG graphic.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

svg_set_background Rate-limited

svg_set_background 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": {
    "svg_set_background": {
      "limits": [
        {
          "counter": "svg_set_background_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 svg_set_background

What does the svg_set_background tool do? +

캔버스 배경색을 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 svg_set_background? +

Register the SVG Canvas MCP server in PolicyLayer and add a rule for svg_set_background: 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 svg_set_background? +

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

Can I rate-limit svg_set_background? +

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

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

svg_set_background 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.