set_component_properties

THE RISK

Medium Risk

Why set_component_properties needs a policy

This tool creates or modifies design data reversibly by changing component variant properties. It is not destructive (properties can be changed back), does not execute arbitrary code, and does not involve financial transactions. The Write category is appropriate.

From the tool's definition Tool description explicitly states "Set component properties" and "switch variants like Type, Size, Style" on Figma design elements. This modifies (writes to) component instances reversibly within a design document.

Documented attack patterns abuse exactly the kind of access set_component_properties gives an agent:

POLICY

How to control set_component_properties

PolicyLayer is an MCP gateway — it sits between your AI agents and Figma AI Bridge, and nothing reaches the server without passing your rules. This is the rule we recommend for set_component_properties:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_component_properties": {
      "limits": [
        {
          "counter": "set_component_properties_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set_component_properties 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.

Create a free account and register Figma AI Bridge — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Figma AI Bridge tools

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All 64 Figma AI Bridge tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_component_properties

What does the set_component_properties tool do? +

Set component properties (variant properties) on a component instance in Figma. Use this to switch variants like Type, Size, Style, etc. It is categorised as a Write tool in the Figma AI Bridge 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_component_properties? +

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

What risk level is set_component_properties? +

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

Can I rate-limit set_component_properties? +

Yes. Add a rate_limit block to the set_component_properties 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_component_properties completely? +

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

set_component_properties is provided by the Figma AI Bridge MCP server (renfei-design/figma_ai_bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Figma AI Bridge tool call.

Start from Figma AI Bridge, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →