set_text_content · MCP Figma MCP: Risk & Policy

WHAT IT DOES

What set_text_content does on MCP Figma

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

WHY IT NEEDS A POLICY

Why set_text_content needs a policy

This tool creates or modifies data (text in Figma designs) reversibly, fitting the Write category. Severity is medium because misuse could corrupt design content and affect collaboration, but changes are undoable and lack the irreversibility of Destructive actions or the code-execution risk of Execute actions. High confidence due to clear, explicit description of the modification operation.

From the tool's definition Tool name 'set_text_content' and description 'Set the text content of an existing text node in Figma' indicate modification of design data. The action is reversible (text can be changed again) and does not permanently destroy data or execute arbitrary code.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_text_content Rate-limited

set_text_content 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_text_content": {
      "limits": [
        {
          "counter": "set_text_content_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 MCP Figma, so you can run agents against it safely.

FAQ

Questions about set_text_content

What does the set_text_content tool do? +

Set the text content of an existing text node in Figma. It is categorised as a Write tool in the MCP Figma 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_text_content? +

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

What risk level is set_text_content? +

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

Can I rate-limit set_text_content? +

Yes. Add a rate_limit block to the set_text_content 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_text_content completely? +

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

set_text_content is provided by the MCP Figma MCP server (yelowflash09/figma_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.