insert_child · Claude Talk to Figma MCP: Risk & Policy

WHAT IT DOES

What insert_child does on Claude Talk to Figma MCP

AI agents use insert_child to create or update resources in Claude Talk to Figma MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Claude Talk to Figma MCP environment.

WHY IT NEEDS A POLICY

Why insert_child needs a policy

The tool creates or modifies design data by inserting child nodes into parent nodes. This is a reversible Write operation (the insertion can be undone). It does not execute arbitrary code, delete data irreversibly, or affect financial systems.

From the tool's definition Tool description states 'Insert a child node inside a parent node in Figma' - this creates/adds new design elements to the document structure, a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_child Rate-limited

insert_child 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": {
    "insert_child": {
      "limits": [
        {
          "counter": "insert_child_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 Claude Talk to Figma MCP, so you can run agents against it safely.

FAQ

Questions about insert_child

What does the insert_child tool do? +

Insert a child node inside a parent node in Figma. It is categorised as a Write tool in the Claude Talk to Figma MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert_child? +

Register the Claude Talk to Figma MCP server in PolicyLayer and add a rule for insert_child: 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 Claude Talk to Figma MCP. Nothing to install.

What risk level is insert_child? +

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

Can I rate-limit insert_child? +

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

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

insert_child is provided by the Claude Talk to Figma MCP server (stranyer/claude-mcp-figma). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.