Draw a spline through points in the active sketch
AI agents use sketch_spline to create or update resources in SolidWorks MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SolidWorks MCP Server environment.
This tool creates a new spline geometry in the active SolidWorks sketch, which is a reversible write/create operation. It modifies the document state but can be undone. Misuse could corrupt a sketch or model, hence medium severity.
From the tool's definition Draw a spline through points in the active sketch
Documented attack patterns abuse exactly the kind of access sketch_spline gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SolidWorks MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for sketch_spline:
{
"version": "1",
"default": "deny",
"tools": {
"sketch_spline": {
"limits": [
{
"counter": "sketch_spline_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}sketch_spline 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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Draw a spline through points in the active sketch. It is categorised as a Write tool in the SolidWorks MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the SolidWorks MCP Server MCP server in PolicyLayer and add a rule for sketch_spline: 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 SolidWorks MCP Server. Nothing to install.
sketch_spline 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 sketch_spline 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 sketch_spline. 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.
sketch_spline is provided by the SolidWorks MCP Server MCP server (jianzhichun/solidworks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SolidWorks MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
84 SolidWorks MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.