AI agents use duplicate_spread to create or update resources in InDesign MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your InDesign MCP Server environment.
Duplicating a spread creates new reversible modifications to a document structure—new pages and layout elements are added but can be undone. This is a Write operation (creates/modifies data reversibly) rather than Execute (which would involve running arbitrary code) or Destructive (which would involve irreversible deletion).
From the tool's definition Tool name 'duplicate_spread' and description 'Duplicate a spread' indicate creation of new design content through copying/replication of existing spreads in an InDesign document.
Documented attack patterns abuse exactly the kind of access duplicate_spread gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and InDesign MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for duplicate_spread:
{
"version": "1",
"default": "deny",
"tools": {
"duplicate_spread": {
"limits": [
{
"counter": "duplicate_spread_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}duplicate_spread 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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Duplicate a spread. It is categorised as a Write tool in the InDesign MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the InDesign MCP Server MCP server in PolicyLayer and add a rule for duplicate_spread: 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 MCP Server. Nothing to install.
duplicate_spread 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 duplicate_spread 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 duplicate_spread. 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.
duplicate_spread is provided by the InDesign MCP Server MCP server (zachshallbetter/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 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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135 InDesign MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.