AI agents call list_styles to retrieve information from IFC Bonsai MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data (available styles in the IFC/Blender model) with no side effects. It fits the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch).' Confidence is slightly reduced due to the empty description, but the operation name is clear enough to classify with high confidence.
From the tool's definition Tool name 'list_styles' indicates a retrieval/enumeration operation. The verb 'list' is a classic Read operation (search, list, get, fetch per the classification rules).
Documented attack patterns abuse exactly the kind of access list_styles 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 list_styles:
{
"version": "1",
"default": "deny",
"tools": {
"list_styles": {}
}
}list_styles is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_styles. It is categorised as a Read tool in the IFC Bonsai MCP MCP Server, which means it retrieves data without modifying state.
Register the IFC Bonsai MCP server in PolicyLayer and add a rule for list_styles: 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.
list_styles is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_styles 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 list_styles. 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.
list_styles 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.