set_layout_sizing · MCP Figma MCP: Risk & Policy

WHAT IT DOES

What set_layout_sizing does on MCP Figma

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

WHY IT NEEDS A POLICY

Why set_layout_sizing needs a policy

set_layout_sizing modifies layout properties of existing design elements but does not irreversibly delete data or execute arbitrary code. Changes to auto-layout sizing are reversible (can be reconfigured), distinguishing it from Destructive operations.

From the tool's definition Tool modifies auto-layout frame sizing configuration ('Set horizontal and vertical sizing modes'), which changes design properties reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_layout_sizing Rate-limited

set_layout_sizing 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": {
    "set_layout_sizing": {
      "limits": [
        {
          "counter": "set_layout_sizing_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 MCP Figma, so you can run agents against it safely.

FAQ

Questions about set_layout_sizing

What does the set_layout_sizing tool do? +

Set horizontal and vertical sizing modes for an auto-layout frame in Figma. It is categorised as a Write tool in the MCP Figma MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_layout_sizing? +

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

What risk level is set_layout_sizing? +

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

Can I rate-limit set_layout_sizing? +

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

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

set_layout_sizing is provided by the MCP Figma MCP server (yelowflash09/figma_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.