Detach master page items from a page
AI agents use detach_master_items to create or update resources in InDesign UXP MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your InDesign UXP MCP Server environment.
Detaching master items is a reversible modification operation: the items themselves remain on the page, but their link to the master page template is severed. This allows independent editing of those items afterward. While this changes document structure and could affect design consistency, it is not destructive (items are not deleted), not an execute operation (no code/commands run), and not financial.
From the tool's definition Tool name 'detach_master_items' and description 'Detach master page items from a page' indicate a modification operation that changes the relationship between page elements and their master page sources, but does not delete or irreversibly destroy content.
Documented attack patterns abuse exactly the kind of access detach_master_items gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and InDesign UXP MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for detach_master_items:
{
"version": "1",
"default": "deny",
"tools": {
"detach_master_items": {
"limits": [
{
"counter": "detach_master_items_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}detach_master_items 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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Detach master page items from a page. It is categorised as a Write tool in the InDesign UXP MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the InDesign UXP MCP Server MCP server in PolicyLayer and add a rule for detach_master_items: 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 UXP MCP Server. Nothing to install.
detach_master_items 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 detach_master_items 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 detach_master_items. 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.
detach_master_items is provided by the InDesign UXP MCP Server MCP server (theloniuser/indesign-uxp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 135 InDesign UXP MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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135 InDesign UXP MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.