set_fills · Figmad MCP: Risk & Policy

WHAT IT DOES

What set_fills does on Figmad

AI agents use set_fills 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 set_fills needs a policy

This tool creates or modifies design data (fill properties) within Figma in a reversible manner. It does not delete or destroy data (would be Destructive), does not execute arbitrary code (would be Execute), and does not move money (would be Financial). The modification is recoverable through undo or subsequent set_fills calls, fitting the Write category.

From the tool's definition "Set fill colors/gradients on a node. Replaces all existing fills." – the tool modifies visual properties of design elements by replacing existing fills, which is a reversible mutation of design data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_fills Rate-limited

set_fills 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_fills": {
      "limits": [
        {
          "counter": "set_fills_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 set_fills

What does the set_fills tool do? +

Set fill colors/gradients on a node. Replaces all existing fills. 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 set_fills? +

Register the Figmad MCP server in PolicyLayer and add a rule for set_fills: 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 set_fills? +

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

Can I rate-limit set_fills? +

Yes. Add a rate_limit block to the set_fills 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_fills completely? +

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

set_fills 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.