AI agents use export_epub 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.
Export operations create new files or output artifacts on the user's system. While the original document remains intact, the export generates new persistent data (an EPUB file). This is a Write-category operation because it creates reversible output—the exported file can be deleted or re-exported without affecting the source document.
From the tool's definition Tool name 'export_epub' and description 'Export document to EPUB' indicate creation of a new file (EPUB format) from the current InDesign document.
Documented attack patterns abuse exactly the kind of access export_epub 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 export_epub:
{
"version": "1",
"default": "deny",
"tools": {
"export_epub": {
"limits": [
{
"counter": "export_epub_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}export_epub 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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Export document to EPUB. 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 export_epub: 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.
export_epub 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 export_epub 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 export_epub. 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.
export_epub 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.