create_arc · Figma MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_arc does on Figma MCP Server

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

WHY IT NEEDS A POLICY

Why create_arc needs a policy

This tool creates new design elements in Figma, which is a reversible modification operation. It adds content to a design file but does not execute arbitrary code, delete data, or trigger financial transactions. The operation can be undone in Figma, making it a Write-category tool rather than Execute or Destructive.

From the tool's definition Tool name 'create_arc' and sibling tools 'create_circle', 'create_rectangle', 'create_line', 'create_polygon', 'create_frame_in_figma' all perform creation operations in Figma. The pattern indicates this tool creates or adds a new arc shape to a Figma design.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_arc Rate-limited

create_arc 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": {
    "create_arc": {
      "limits": [
        {
          "counter": "create_arc_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 Figma MCP Server, so you can run agents against it safely.

FAQ

Questions about create_arc

What does the create_arc tool do? +

create_arc. It is categorised as a Write tool in the Figma MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_arc? +

Register the Figma MCP Server MCP server in PolicyLayer and add a rule for create_arc: 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 Figma MCP Server. Nothing to install.

What risk level is create_arc? +

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

Can I rate-limit create_arc? +

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

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

create_arc is provided by the Figma MCP Server MCP server (sichang824/mcp-figma). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.