Create a rectangle shape
AI agents use create_rectangle to create or update resources in Indesign — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Indesign environment.
Creating a rectangle shape is a document modification operation that is reversible (the shape can be deleted). It does not retrieve data (Read), execute arbitrary code (Execute), permanently destroy content (Destructive), or involve financial transactions (Financial). It falls squarely into the Write category as a benign creative operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name is 'create_rectangle' and description states 'Create a rectangle shape'. This creates a new graphical element within an InDesign document.
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 Indesign, 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 rectangle shape. It is categorised as a Write tool in the Indesign MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Indesign 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 Indesign. 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 Indesign MCP server (lucdesign/indesign-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Indesign, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Indesign tools catalogued and risk-classified — across an index of 43,000+ MCP servers.