geometry_add_circle · Flex Sensor Agent MCP: Risk & Policy

WHAT IT DOES

What geometry_add_circle does on Flex Sensor Agent

AI agents use geometry_add_circle to create or update resources in Flex Sensor Agent — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Flex Sensor Agent environment.

WHY IT NEEDS A POLICY

Why geometry_add_circle needs a policy

Based on the tool name, this likely creates/adds a circle to a geometry model in COMSOL, which is a Write operation (creating/modifying data reversibly). The empty description lowers confidence. In the context of a COMSOL simulation server, geometry operations are non-destructive writes to a simulation model.

From the tool's definition Tool name 'geometry_add_circle' suggests adding a circle geometry element; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

geometry_add_circle Rate-limited

geometry_add_circle 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "geometry_add_circle": {
      "limits": [
        {
          "counter": "geometry_add_circle_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Flex Sensor Agent, so you can run agents against it safely.

FAQ

Questions about geometry_add_circle

What does the geometry_add_circle tool do? +

geometry_add_circle. It is categorised as a Write tool in the Flex Sensor Agent MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on geometry_add_circle? +

Register the Flex Sensor Agent MCP server in PolicyLayer and add a rule for geometry_add_circle: 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 Flex Sensor Agent. Nothing to install.

What risk level is geometry_add_circle? +

geometry_add_circle is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit geometry_add_circle? +

Yes. Add a rate_limit block to the geometry_add_circle 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.

How do I block geometry_add_circle completely? +

Set action: deny in the PolicyLayer policy for geometry_add_circle. 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.

What MCP server provides geometry_add_circle? +

geometry_add_circle is provided by the Flex Sensor Agent MCP server (tonghui666/flex-sensor-agent-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.