AI agents use create_slab 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 model geometry (a slab), which is a reversible modification to the model state. This falls under Write rather than Execute because it is a high-level domain operation (not arbitrary code execution) and reversible (can be deleted or modified). No description was provided, slightly lowering confidence, but the naming convention and sibling context make the intent clear.
From the tool's definition Tool name is 'create_slab'; sibling tools include create_door, create_mesh_ifc, create_pbr_style, create_polyline_walls, create_roof, create_stairs, all of which create IFC model elements.
Documented attack patterns abuse exactly the kind of access create_slab 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_slab:
{
"version": "1",
"default": "deny",
"tools": {
"create_slab": {
"limits": [
{
"counter": "create_slab_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_slab 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_slab. 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_slab: 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_slab 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_slab 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_slab. 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_slab 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.
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52 IFC Bonsai MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.