set_default_connector · MCP Figma MCP: Risk & Policy

WHAT IT DOES

What set_default_connector does on MCP Figma

AI agents use set_default_connector 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_default_connector needs a policy

This tool modifies design data (sets a default connector) but does not delete, execute arbitrary operations, or cause financial effects. The change is reversible by setting a different default. The blast radius is limited to design configuration preferences affecting connector behavior, with minimal unintended consequences if invoked on the wrong design or connector.

From the tool's definition The tool 'set_default_connector' sets a connector node as default, which modifies Figma design state. Related tools include 'create_connections', 'delete_node', and 'create_frame', confirming this server handles design modifications.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_default_connector Rate-limited

set_default_connector 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_default_connector": {
      "limits": [
        {
          "counter": "set_default_connector_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_default_connector

What does the set_default_connector tool do? +

Set a copied connector node as the default connector. 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_default_connector? +

Register the MCP Figma MCP server in PolicyLayer and add a rule for set_default_connector: 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_default_connector? +

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

Can I rate-limit set_default_connector? +

Yes. Add a rate_limit block to the set_default_connector 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_default_connector completely? +

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

set_default_connector 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.