AI agents use apply_style_to_object to create or update resources in IFC Bonsai MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your IFC Bonsai MCP environment.
The tool modifies IFC model objects by applying visual or material styling. This is a reversible write operation (the style can be changed or removed), not destructive. The description is empty, reducing confidence slightly, but the context of an IFC editor server and the clear 'apply_*' verb indicates data modification rather than deletion or execution of arbitrary code.
From the tool's definition Tool name 'apply_style_to_object' combined with sibling tools like 'create_pbr_style', 'create_slab', 'create_roof' that create and edit IFC models. The server is explicitly designed to 'create, and edit IFC models'.
Documented attack patterns abuse exactly the kind of access apply_style_to_object gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and IFC Bonsai MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for apply_style_to_object:
{
"version": "1",
"default": "deny",
"tools": {
"apply_style_to_object": {
"limits": [
{
"counter": "apply_style_to_object_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}apply_style_to_object 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_style_to_object. It is categorised as a Write tool in the IFC Bonsai MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the IFC Bonsai MCP server in PolicyLayer and add a rule for apply_style_to_object: 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 IFC Bonsai MCP. Nothing to install.
apply_style_to_object 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_style_to_object 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_style_to_object. 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_style_to_object is provided by the IFC Bonsai MCP server (show2instruct/ifc-bonsai-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 52 IFC Bonsai MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
52 IFC Bonsai MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.