geometry_add_sphere · Flex Sensor Agent MCP: Risk & Policy

WHAT IT DOES

What geometry_add_sphere does on Flex Sensor Agent

AI agents use geometry_add_sphere 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_sphere needs a policy

Based on the name alone, this tool likely creates/adds a sphere geometry element to a COMSOL simulation model, which is a reversible write operation. Confidence is reduced due to the empty description. In context of a COMSOL simulation server, geometry operations modify the simulation model state but are generally reversible.

From the tool's definition Tool name 'geometry_add_sphere' suggests adding a sphere geometry object; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

geometry_add_sphere Rate-limited

geometry_add_sphere 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_sphere": {
      "limits": [
        {
          "counter": "geometry_add_sphere_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

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_sphere

What does the geometry_add_sphere tool do? +

geometry_add_sphere. 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_sphere? +

Register the Flex Sensor Agent MCP server in PolicyLayer and add a rule for geometry_add_sphere: 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_sphere? +

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

Can I rate-limit geometry_add_sphere? +

Yes. Add a rate_limit block to the geometry_add_sphere 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_sphere completely? +

Set action: deny in the PolicyLayer policy for geometry_add_sphere. 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_sphere? +

geometry_add_sphere 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.