AI agents use create_sketch to create or update resources in FreeCAD Robust MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeCAD Robust MCP Server environment.
The tool creates new data structures (sketches) in FreeCAD's document model. While the description is uninformative, the naming convention and server context indicate this is a create/write operation rather than destructive (sketches can be deleted) or execute (it doesn't run arbitrary code). Confidence is moderate (0.75) due to the empty description; higher confidence would require explicit documentation.
From the tool's definition Tool named 'create_sketch' with no description provided. Based on sibling tools (add_sketch_arc, add_sketch_bspline, add_sketch_circle, etc.) and the server's purpose of '3D modeling, macro development,' this tool creates new sketch objects in FreeCAD, which…
Documented attack patterns abuse exactly the kind of access create_sketch 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 create_sketch:
{
"version": "1",
"default": "deny",
"tools": {
"create_sketch": {
"limits": [
{
"counter": "create_sketch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_sketch 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_sketch. It is categorised as a Write tool in the FreeCAD Robust MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for create_sketch: 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.
create_sketch 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_sketch 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_sketch. 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_sketch 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.