collect_bound_variables

THE RISK

Low Risk

Why collect_bound_variables needs a policy

This tool only reads and aggregates information about bound variables in a node tree. It performs no modifications, deletions, or executions - purely a data retrieval/query operation.

From the tool's definition Collect and aggregate all bound design token variables across a node tree with their resolved values

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

POLICY

How to control collect_bound_variables

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 collect_bound_variables:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "collect_bound_variables": {}
  }
}

collect_bound_variables is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 64 Figma AI Bridge tools →

Read 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about collect_bound_variables

What does the collect_bound_variables tool do? +

Collect and aggregate all bound design token variables across a node tree with their resolved values. It is categorised as a Read tool in the Figma AI Bridge MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on collect_bound_variables? +

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

collect_bound_variables is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit collect_bound_variables? +

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

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

collect_bound_variables 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 →