bind_variable_to_stroke

THE RISK

Medium Risk

Why bind_variable_to_stroke needs a policy

The tool creates or modifies a design property (stroke binding) in Figma, which is a reversible change to the document state. This falls under Write category—it changes data without permanently deleting or executing arbitrary code.

From the tool's definition Tool name 'bind_variable_to_stroke' and description 'Bind a design token variable to a node' indicate this modifies a node's stroke property by associating a variable with it. This is a reversible modification of design data.

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

POLICY

How to control bind_variable_to_stroke

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 bind_variable_to_stroke:

policy.json

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

bind_variable_to_stroke 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

Destructive delete_multiple_nodes Delete multiple nodes from Figma at once Destructive delete_node Delete a node from Figma Execute set_focus Set focus on a specific node in Figma by selecting it and scrolling viewport to it Execute set_selections Set selection to multiple nodes in Figma and scroll viewport to show them Write batch_slides Create multiple presentation slides in Figma in a single batch call. Much faster than crea Write bind_variable_to_fill Bind a design token variable to a node Write clone_node Clone an existing node in Figma Write create_component_instance Create an instance of a component in Figma

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 bind_variable_to_stroke

What does the bind_variable_to_stroke tool do? +

Bind a design token variable to a node. 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 bind_variable_to_stroke? +

Register the Figma AI Bridge MCP server in PolicyLayer and add a rule for bind_variable_to_stroke: 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 bind_variable_to_stroke? +

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

Can I rate-limit bind_variable_to_stroke? +

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

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

bind_variable_to_stroke 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 →