AI agents use apply_paragraph_style 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.
Applying a paragraph style modifies text formatting in the InDesign document but does not execute arbitrary code, delete content, or trigger financial transactions. It is reversible (styles can be changed or removed), making it a Write category tool. Severity is medium because an AI agent could alter document appearance extensively, but this does not cause data loss or irreversible harm.
From the tool's definition Tool name 'apply_paragraph_style' and description 'Apply a paragraph style to text' indicate modification of document formatting properties. This is a reversible write operation that changes text styling without deleting or executing code.
Documented attack patterns abuse exactly the kind of access apply_paragraph_style 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 apply_paragraph_style:
{
"version": "1",
"default": "deny",
"tools": {
"apply_paragraph_style": {
"limits": [
{
"counter": "apply_paragraph_style_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}apply_paragraph_style 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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Apply a paragraph style to text. 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 apply_paragraph_style: 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.
apply_paragraph_style 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 apply_paragraph_style 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 apply_paragraph_style. 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.
apply_paragraph_style 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.
Free to start. No card required.
135 InDesign UXP MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.