AI agents call preflight_document 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.
Preflight is a validation/inspection process that checks a document for potential issues (missing fonts, images, etc.) without modifying or deleting any content. It is a read-only analysis operation, though it may generate a report as a side effect.
From the tool's definition Run preflight on the document
Documented attack patterns abuse exactly the kind of access preflight_document 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 preflight_document:
{
"version": "1",
"default": "deny",
"tools": {
"preflight_document": {}
}
}preflight_document is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Run preflight on 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 preflight_document: 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.
preflight_document 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 preflight_document 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 preflight_document. 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.
preflight_document 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.