AI agents use create_rectangle to create or update resources in Figma AI Bridge — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Figma AI Bridge environment.
This tool creates a new design object (rectangle) in Figma, modifying the document by adding content. This is a reversible Write operation since the created rectangle can be deleted or undone. It has medium severity because misuse could clutter or alter a design document, but the impact is limited to design layer modifications within a single design application and the changes are easily undone.
From the tool's definition Tool description states 'Create a new rectangle in Figma', which is a create operation that adds new design content to the canvas.
Documented attack patterns abuse exactly the kind of access create_rectangle gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Figma AI Bridge, and nothing reaches the server without passing your rules. This is the rule we recommend for create_rectangle:
{
"version": "1",
"default": "deny",
"tools": {
"create_rectangle": {
"limits": [
{
"counter": "create_rectangle_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_rectangle 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.
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Create a new rectangle in Figma. It is categorised as a Write tool in the Figma AI Bridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Figma AI Bridge MCP server in PolicyLayer and add a rule for create_rectangle: 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 AI Bridge. Nothing to install.
create_rectangle is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_rectangle 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.
Set action: deny in the PolicyLayer policy for create_rectangle. 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.
create_rectangle is provided by the Figma AI Bridge MCP server (renfei-design/figma_ai_bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Figma AI Bridge, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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64 Figma AI Bridge tools catalogued and risk-classified — across an index of 43,000+ MCP servers.