AI agents call draft_list_fonts to retrieve information from FreeCAD Robust MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to enumerate or retrieve font data available in FreeCAD's Draft workbench. This is a passive information retrieval operation with no side effects. Although the description is empty, the naming convention and context within a 3D modeling tool strongly suggest it queries and returns font information rather than creating, modifying, executing code, or destroying data.
From the tool's definition Tool name 'draft_list_fonts' indicates a query operation that retrieves/lists available fonts without modifying state. The 'list' verb is associated with read-only operations.
Documented attack patterns abuse exactly the kind of access draft_list_fonts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FreeCAD Robust MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for draft_list_fonts:
{
"version": "1",
"default": "deny",
"tools": {
"draft_list_fonts": {}
}
}draft_list_fonts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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draft_list_fonts. It is categorised as a Read tool in the FreeCAD Robust MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for draft_list_fonts: 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 FreeCAD Robust MCP Server. Nothing to install.
draft_list_fonts 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 draft_list_fonts 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 draft_list_fonts. 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.
draft_list_fonts is provided by the FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 152 FreeCAD Robust MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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152 FreeCAD Robust MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.