AI agents use duplicate_page 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.
Duplicating a page in InDesign creates new content (a copy of an existing page) without irreversibly modifying or deleting anything. This is a standard Write operation—reversible and non-destructive. The severity is low because duplicating a page has minimal blast radius; the worst outcome is unnecessary disk usage or a cluttered document, both easily undone via undo or deletion.
From the tool's definition Tool name 'duplicate_page' and description 'Duplicate a page' indicate the tool creates a copy of an existing page. Duplication is a reversible operation that adds content without permanently altering or destroying existing data.
Documented attack patterns abuse exactly the kind of access duplicate_page 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 duplicate_page:
{
"version": "1",
"default": "deny",
"tools": {
"duplicate_page": {
"limits": [
{
"counter": "duplicate_page_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}duplicate_page 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 page. 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 duplicate_page: 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.
duplicate_page 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_page 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_page. 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_page 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.