draw_ellipse · Paint MCP: Risk & Policy

WHAT IT DOES

What draw_ellipse does on Paint MCP

AI agents use draw_ellipse to create or update resources in Paint MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Paint MCP environment.

WHY IT NEEDS A POLICY

Why draw_ellipse needs a policy

This tool creates visual content on a drawing canvas by adding an ellipse shape. It modifies the canvas state but does not delete, destroy, execute code, access external systems, or perform financial transactions. The effect is reversible and limited to the scope of the canvas object, making it a Write operation with low severity—misuse would only affect the digital artwork, not cause real-world harm or data loss.

From the tool's definition Tool name 'draw_ellipse' and description 'Draw an ellipse bounded by the rectangle at (x, y) with given size' indicate a drawing operation that creates or modifies canvas state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_ellipse Rate-limited

draw_ellipse 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_ellipse": {
      "limits": [
        {
          "counter": "draw_ellipse_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Paint MCP, so you can run agents against it safely.

FAQ

Questions about draw_ellipse

What does the draw_ellipse tool do? +

Draw an ellipse bounded by the rectangle at (x, y) with given size. It is categorised as a Write tool in the Paint 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_ellipse? +

Register the Paint MCP server in PolicyLayer and add a rule for draw_ellipse: 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 Paint MCP. Nothing to install.

What risk level is draw_ellipse? +

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

Can I rate-limit draw_ellipse? +

Yes. Add a rate_limit block to the draw_ellipse 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_ellipse completely? +

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

draw_ellipse is provided by the Paint MCP server (joeyballentine/paint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.