set_annotation · MCP Figma MCP: Risk & Policy

WHAT IT DOES

What set_annotation does on MCP Figma

AI agents use set_annotation 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_annotation needs a policy

This tool falls under Write category because it creates or modifies data (annotations) in a reversible manner. Annotations are metadata attached to design elements and can be edited or removed later. The severity is medium because misuse could clutter designs with unwanted annotations or mislead collaborators, but the impact is limited to annotation metadata rather than core design assets.

From the tool's definition 'Create or update an annotation' – the tool modifies existing annotations or creates new ones, which are reversible changes to design metadata in Figma.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_annotation Rate-limited

set_annotation 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_annotation": {
      "limits": [
        {
          "counter": "set_annotation_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_annotation

What does the set_annotation tool do? +

Create or update an annotation. 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_annotation? +

Register the MCP Figma MCP server in PolicyLayer and add a rule for set_annotation: 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_annotation? +

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

Can I rate-limit set_annotation? +

Yes. Add a rate_limit block to the set_annotation 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_annotation completely? +

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

set_annotation 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.