smart_text_replace · Figma Copilot MCP: Risk & Policy

WHAT IT DOES

What smart_text_replace does on Figma Copilot

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

WHY IT NEEDS A POLICY

Why smart_text_replace needs a policy

An AI agent can call smart_text_replace faster than any human can review — one bad instruction and it creates or modifies resources in Figma Copilot by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

smart_text_replace Rate-limited

smart_text_replace 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": {
    "smart_text_replace": {
      "limits": [
        {
          "counter": "smart_text_replace_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 Figma Copilot, so you can run agents against it safely.

FAQ

Questions about smart_text_replace

What does the smart_text_replace tool do? +

Replace specific text in a node while preserving the formatting of unchanged portions. Only replaced text gets default formatting. It is categorised as a Write tool in the Figma Copilot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on smart_text_replace? +

Register the Figma Copilot MCP server in PolicyLayer and add a rule for smart_text_replace: 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 Copilot. Nothing to install.

What risk level is smart_text_replace? +

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

Can I rate-limit smart_text_replace? +

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

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

smart_text_replace is provided by the Figma Copilot MCP server (xlzuvekas/figma-copilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.