AI agents use create_trimesh_ifc 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 creates IFC objects (trimesh geometry), which is a reversible Write operation that modifies the IFC model structure. Confidence is 0.75 rather than higher because the description is empty, leaving some ambiguity about exact behavior; however, the name pattern and sibling tools provide strong contextual evidence for Write categorization.
From the tool's definition Tool name 'create_trimesh_ifc' indicates creation of IFC geometry; sibling tools include 'create_door', 'create_mesh_ifc', 'create_slab', 'create_roof' which are all Write category operations.
Documented attack patterns abuse exactly the kind of access create_trimesh_ifc 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 create_trimesh_ifc:
{
"version": "1",
"default": "deny",
"tools": {
"create_trimesh_ifc": {
"limits": [
{
"counter": "create_trimesh_ifc_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_trimesh_ifc 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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create_trimesh_ifc. 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 create_trimesh_ifc: 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.
create_trimesh_ifc 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 create_trimesh_ifc 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 create_trimesh_ifc. 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.
create_trimesh_ifc 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.