AI agents invoke select_page_item to trigger actions in InDesign UXP MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Selecting a page item is an interactive UI operation executed within InDesign. It doesn't read data passively or write/modify content, but it does trigger an external application action (changing the selection state in InDesign), which falls under Execute. Blast radius is low as selection itself doesn't modify document content.
From the tool's definition "Select a specific page item" — triggers a UI/selection action in InDesign via the UXP plugin bridge
Documented attack patterns abuse exactly the kind of access select_page_item 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 select_page_item:
{
"version": "1",
"default": "deny",
"tools": {
"select_page_item": {
"limits": [
{
"counter": "select_page_item_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}select_page_item stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Select a specific page item. It is categorised as a Execute tool in the InDesign UXP MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the InDesign UXP MCP Server MCP server in PolicyLayer and add a rule for select_page_item: 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.
select_page_item is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the select_page_item 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 select_page_item. 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.
select_page_item 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.