Draw an arc in the active sketch. AUTOMATIC: This tool automatically ensures an active sketch context before drawing. The arc is defined by center point, start point, end point, and direction (clockwise/counterclockwise).
AI agents invoke sketch_arc to trigger actions in SolidWorks MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
While the tool creates/modifies sketch geometry (which could suggest Write category), it is classified as Execute because it triggers an external CAD application operation (SolidWorks COM interface) whose effects depend entirely on the input arguments (coordinates, direction). The tool does not merely store data—it actively manipulates a complex 3D model via an intelligent COM bridge.
From the tool's definition Tool 'sketch_arc' performs 'Draw an arc in the active sketch' — this is an active operation that modifies the CAD model state by adding a geometric element.
Documented attack patterns abuse exactly the kind of access sketch_arc 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_arc:
{
"version": "1",
"default": "deny",
"tools": {
"sketch_arc": {
"limits": [
{
"counter": "sketch_arc_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}sketch_arc stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Draw an arc in the active sketch. AUTOMATIC: This tool automatically ensures an active sketch context before drawing. The arc is defined by center point, start point, end point, and direction (clockwise/counterclockwise). It is categorised as a Execute tool in the SolidWorks MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the SolidWorks MCP Server MCP server in PolicyLayer and add a rule for sketch_arc: 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_arc is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the sketch_arc 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_arc. 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_arc 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.