AI agents use export_epub to create or update resources in Indesign — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Indesign environment.
This tool writes/creates a new file output (EPUB export) which is a reversible operation. The exported file can be deleted or overwritten. While it involves document manipulation, it does not delete or destructively modify the source document, nor does it execute arbitrary code or move money.
From the tool's definition Tool performs "Export document as EPUB" - creates a new file in EPUB format from the current 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, 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.
Free to start. No card required.
Export document as EPUB. It is categorised as a Write tool in the Indesign MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Indesign 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. 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 MCP server (lucdesign/indesign-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Indesign, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
36 Indesign tools catalogued and risk-classified — across an index of 43,000+ MCP servers.