AI agents invoke draw_rectangle to trigger actions in Nonead Universal-Robots 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.
This tool commands a physical robot arm to execute a motion sequence (drawing a rectangle/square), which constitutes an external physical operation with real-world consequences. Misuse could cause the robot to move unexpectedly, potentially harming people or equipment nearby.
From the tool's definition 画一个正方形 (draw a square/rectangle) — triggers real-time physical motion of a Universal Robots cobot arm to trace a geometric path given a start position and side lengths
Documented attack patterns abuse exactly the kind of access draw_rectangle gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nonead Universal-Robots MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for draw_rectangle:
{
"version": "1",
"default": "deny",
"tools": {
"draw_rectangle": {
"limits": [
{
"counter": "draw_rectangle_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}draw_rectangle 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.
给定起点位置和边长，在水平或竖直方向画一个正方形. It is categorised as a Execute tool in the Nonead Universal-Robots MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Nonead Universal-Robots MCP Server MCP server in PolicyLayer and add a rule for draw_rectangle: 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 Nonead Universal-Robots MCP Server. Nothing to install.
draw_rectangle 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 draw_rectangle 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 draw_rectangle. 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.
draw_rectangle is provided by the Nonead Universal-Robots MCP Server MCP server (nonead/nonead-universal-robots-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nonead Universal-Robots 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.
39 Nonead Universal-Robots MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.