param_set · Flex Sensor Agent MCP: Risk & Policy

WHAT IT DOES

What param_set does on Flex Sensor Agent

AI agents use param_set 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 param_set needs a policy

Without explicit description, we infer from naming convention and server context that 'param_set' creates or modifies simulation parameters reversibly. This is Write-category behavior: parameters can be changed again, experiments can be adjusted, but the tool doesn't delete data (Destructive), execute arbitrary code (Execute), or move money (Financial).

From the tool's definition Tool name 'param_set' indicates parameter setting/modification. Context shows this is a COMSOL Multiphysics simulation server where parameters control sensor behavior and simulation outcomes.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

param_set Rate-limited

param_set 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": {
    "param_set": {
      "limits": [
        {
          "counter": "param_set_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 param_set

What does the param_set tool do? +

param_set. 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 param_set? +

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

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

Can I rate-limit param_set? +

Yes. Add a rate_limit block to the param_set 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 param_set completely? +

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

param_set 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.