draw_point · Paint MCP: Risk & Policy

WHAT IT DOES

What draw_point does on Paint MCP

AI agents use draw_point 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_point needs a policy

The tool creates a single visual element on a canvas without side effects beyond the intended drawing. It is reversible (the canvas can be cleared via clear_canvas or overdrawn), does not execute arbitrary code, does not delete data, and does not involve financial transactions.

From the tool's definition Tool name 'draw_point' and description 'Draw a single dot at (x, y)' indicate a creative drawing operation that modifies canvas state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_point Rate-limited

draw_point 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_point": {
      "limits": [
        {
          "counter": "draw_point_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 Paint MCP, so you can run agents against it safely.

FAQ

Questions about draw_point

What does the draw_point tool do? +

Draw a single dot at (x, y). 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_point? +

Register the Paint MCP server in PolicyLayer and add a rule for draw_point: 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_point? +

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

Can I rate-limit draw_point? +

Yes. Add a rate_limit block to the draw_point 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_point completely? +

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

draw_point 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.