Set page background by creating a full-page rectangle with specified color
AI agents use set_page_background 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.
This tool creates or modifies design elements in an InDesign document but does not delete data or execute arbitrary code. While it changes the document's visual state, the change is reversible through standard editing operations. Classified as Write rather than Execute because it performs a specific, bounded design operation (adding a colored rectangle) rather than running arbitrary commands.
From the tool's definition Tool creates a new full-page rectangle object with specified color properties, which modifies the page layout and visual design of the InDesign document. The action is reversible (the rectangle can be deleted or modified later).
Documented attack patterns abuse exactly the kind of access set_page_background 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 set_page_background:
{
"version": "1",
"default": "deny",
"tools": {
"set_page_background": {
"limits": [
{
"counter": "set_page_background_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_page_background 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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Set page background by creating a full-page rectangle with specified color. 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 set_page_background: 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.
set_page_background 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 set_page_background 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 set_page_background. 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.
set_page_background 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.
Free to start. No card required.
135 InDesign UXP MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.