draw_circle · farshid-mcp-imageProcessing MCP: Risk & Policy

WHAT IT DOES

What draw_circle does on farshid-mcp-imageProcessing

AI agents use draw_circle to create or update resources in farshid-mcp-imageProcessing — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your farshid-mcp-imageProcessing environment.

WHY IT NEEDS A POLICY

Why draw_circle needs a policy

This tool writes/modifies image data by drawing a circle onto an existing image. It is reversible in the sense that the original image can be preserved, but it does alter image content. No code execution, deletion, or financial action is involved. Blast radius is low as it only affects local image files.

From the tool's definition 'Draw a circle. thickness=-1 fills.' — modifies an image by drawing onto it.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_circle Rate-limited

draw_circle 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_circle": {
      "limits": [
        {
          "counter": "draw_circle_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 farshid-mcp-imageProcessing, so you can run agents against it safely.

FAQ

Questions about draw_circle

What does the draw_circle tool do? +

Draw a circle. thickness=-1 fills. It is categorised as a Write tool in the farshid-mcp-imageProcessing 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_circle? +

Register the farshid-mcp-imageProcessing MCP server in PolicyLayer and add a rule for draw_circle: 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 farshid-mcp-imageProcessing. Nothing to install.

What risk level is draw_circle? +

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

Can I rate-limit draw_circle? +

Yes. Add a rate_limit block to the draw_circle 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_circle completely? +

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

draw_circle is provided by the farshid-mcp-imageProcessing MCP server (pirahansiah/farshid-mcp-imageprocessing). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.