layer_select · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What layer_select does on SVG Canvas MCP

AI agents use layer_select 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_select needs a policy

Selecting/changing the active layer is a state modification operation that affects the canvas environment but is reversible (another layer can be selected). This is distinct from Read (which would only query which layer is active) and is clearly not Execute, Destructive, Financial, or Other. Write is the appropriate category for state-modifying operations that are not destructive.

From the tool's definition Tool name 'layer_select' and description '활성 레이어를 선택합니다' (selects the active layer) indicates it modifies application state by changing which layer is currently active in the SVG canvas.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

layer_select Rate-limited

layer_select 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_select": {
      "limits": [
        {
          "counter": "layer_select_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_select

What does the layer_select tool do? +

활성 레이어를 선택합니다. 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_select? +

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

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

Can I rate-limit layer_select? +

Yes. Add a rate_limit block to the layer_select 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_select completely? +

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

layer_select 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.