generate_ui · Figmad MCP: Risk & Policy

WHAT IT DOES

What generate_ui does on Figmad

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

WHY IT NEEDS A POLICY

Why generate_ui needs a policy

This tool creates new design elements in Figma based on user input. While it modifies the design file by adding UI components, these changes are reversible (elements can be deleted via the delete_node sibling tool). It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool description states it "creates corresponding Figma elements" in response to text input, and sibling tools include create_frame, create_rectangle, create_text which are Write operations. The verb "Generate" and "creates" indicate reversible data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_ui Rate-limited

generate_ui 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": {
    "generate_ui": {
      "limits": [
        {
          "counter": "generate_ui_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 Figmad, so you can run agents against it safely.

FAQ

Questions about generate_ui

What does the generate_ui tool do? +

Generate a UI design from a text description. Parses the prompt for common UI patterns (header, hero, cards, form, footer) and creates corresponding Figma elements. It is categorised as a Write tool in the Figmad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_ui? +

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

What risk level is generate_ui? +

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

Can I rate-limit generate_ui? +

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

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

generate_ui is provided by the Figmad MCP server (toro1221/figmad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.