draw_text · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What draw_text does on SVG Canvas MCP

AI agents use draw_text 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 draw_text needs a policy

Adding text to an SVG graphic is a creative/write operation that creates new content elements. It is reversible (text can be deleted or edited), so it does not qualify as Destructive. There are no side effects beyond the intended graphic modification, no code execution, and no financial impact. Write is the appropriate category for content creation operations.

From the tool's definition Tool name 'draw_text' and description '텍스트를 추가합니다' (adds text) indicate creation of content within an SVG canvas. This modifies the graphic by adding text elements, which is reversible through standard editing operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_text Rate-limited

draw_text 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": {
    "draw_text": {
      "limits": [
        {
          "counter": "draw_text_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 draw_text

What does the draw_text tool do? +

텍스트를 추가합니다. 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 draw_text? +

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

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

Can I rate-limit draw_text? +

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

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

draw_text 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.