List all master spreads in the document
AI agents call list_master_spreads to retrieve information from InDesign UXP MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries document structure to retrieve information about master spreads. It has no side effects, does not modify data, execute code, delete resources, or commit financial transactions. It is a straightforward data retrieval operation consistent with the Read category.
From the tool's definition Tool name 'list_master_spreads' and description 'List all master spreads in the document' indicate a read-only operation that retrieves and enumerates existing master spread data without modification.
Documented attack patterns abuse exactly the kind of access list_master_spreads 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 list_master_spreads:
{
"version": "1",
"default": "deny",
"tools": {
"list_master_spreads": {}
}
}list_master_spreads is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all master spreads in the document. It is categorised as a Read tool in the InDesign UXP MCP Server MCP Server, which means it retrieves data without modifying state.
Register the InDesign UXP MCP Server MCP server in PolicyLayer and add a rule for list_master_spreads: 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.
list_master_spreads is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_master_spreads 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 list_master_spreads. 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.
list_master_spreads 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.