watermark_text · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What watermark_text does on SVG Canvas MCP

AI agents use watermark_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 watermark_text needs a policy

Adding a watermark is a write operation because it modifies the canvas state reversibly. The user or an AI agent can remove or modify the watermark later. It does not execute arbitrary code, destroy data, move money, or perform irreversible actions. The severity is low because watermarks are benign visual overlays with minimal blast radius—the worst case is unwanted visual marking of a design, which is easily undone.

From the tool's definition The tool name is 'watermark_text' and description states it 'applies a text watermark to the current canvas' (translated from Korean: '텍스트 워터마크를 현재 캔버스에 적용합니다').

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

watermark_text Rate-limited

watermark_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": {
    "watermark_text": {
      "limits": [
        {
          "counter": "watermark_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 watermark_text

What does the watermark_text tool do? +

텍스트 워터마크를 현재 캔버스에 적용합니다. 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 watermark_text? +

Register the SVG Canvas MCP server in PolicyLayer and add a rule for watermark_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 watermark_text? +

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

Can I rate-limit watermark_text? +

Yes. Add a rate_limit block to the watermark_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 watermark_text completely? +

Set action: deny in the PolicyLayer policy for watermark_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 watermark_text? +

watermark_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.