symbol_define · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What symbol_define does on SVG Canvas MCP

AI agents use symbol_define 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 symbol_define needs a policy

This tool creates or registers symbol definitions in SVG graphics, which is a data modification operation that can be undone or overwritten. It has no irreversible destructive effects, does not execute arbitrary code/commands, and does not access external systems or financial resources. The blast radius is limited to the SVG graphic being edited.

From the tool's definition Tool name 'symbol_define' and description 'Defines an object as a reusable symbol' (translated from Korean) indicates creation/modification of SVG symbol definitions within the canvas, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

symbol_define Rate-limited

symbol_define 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": {
    "symbol_define": {
      "limits": [
        {
          "counter": "symbol_define_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 symbol_define

What does the symbol_define tool do? +

객체를 재사용 가능한 심볼로 정의합니다. 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 symbol_define? +

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

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

Can I rate-limit symbol_define? +

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

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

symbol_define 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.