set_font_weight · Claude Talk to Figma MCP: Risk & Policy

WHAT IT DOES

What set_font_weight does on Claude Talk to Figma MCP

AI agents use set_font_weight 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 set_font_weight needs a policy

This tool directly modifies design properties within Figma (font weight of text nodes), which constitutes a write operation. It is not destructive because font weight changes are reversible and can be undone. It does not involve data deletion, code execution, or financial operations. Medium severity reflects that misuse could alter many design elements across documents, but changes remain editable and recoverable.

From the tool's definition Tool modifies text styling properties in Figma by setting font weight of a text node. This is reversible and creates/modifies design data without deleting or executing external operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_font_weight Rate-limited

set_font_weight 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_font_weight": {
      "limits": [
        {
          "counter": "set_font_weight_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 set_font_weight

What does the set_font_weight tool do? +

Set the font weight of a text 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 set_font_weight? +

Register the Claude Talk to Figma MCP server in PolicyLayer and add a rule for set_font_weight: 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 set_font_weight? +

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

Can I rate-limit set_font_weight? +

Yes. Add a rate_limit block to the set_font_weight 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_font_weight completely? +

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

set_font_weight 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.