batch_strokes · Paint MCP: Risk & Policy

WHAT IT DOES

What batch_strokes does on Paint MCP

AI agents use batch_strokes 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 batch_strokes needs a policy

Based on the server context (a Pygame drawing canvas) and sibling tools that all perform drawing operations, 'batch_strokes' most likely executes multiple drawing strokes in batch on the canvas — a reversible write operation. Confidence is lowered due to the empty description.

From the tool's definition Tool name is 'batch_strokes'; description is empty. Sibling tools include draw_ellipse, draw_line, draw_path, draw_rect, blend_path — all drawing/write operations on a canvas.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

batch_strokes Rate-limited

batch_strokes 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": {
    "batch_strokes": {
      "limits": [
        {
          "counter": "batch_strokes_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 batch_strokes

What does the batch_strokes tool do? +

batch_strokes. 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 batch_strokes? +

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

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

Can I rate-limit batch_strokes? +

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

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

batch_strokes 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.