set_target_power · Joulescope MCP: Risk & Policy

WHAT IT DOES

What set_target_power does on Joulescope

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

WHY IT NEEDS A POLICY

Why set_target_power needs a policy

Based on the tool name and server context (JouleScope JS220 energy analyzer), 'set_target_power' likely configures or toggles power delivery to a device under test. This is a Write/Execute action with moderate blast radius since enabling/disabling power to hardware could affect connected devices. The empty description lowers confidence significantly.

From the tool's definition Tool name 'set_target_power' and sibling tool 'cycle_target_power' suggest controlling power output to a target device. Description is empty, lowering confidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_target_power Rate-limited

set_target_power 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": {
    "set_target_power": {
      "limits": [
        {
          "counter": "set_target_power_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 Joulescope, so you can run agents against it safely.

FAQ

Questions about set_target_power

What does the set_target_power tool do? +

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

How do I enforce a policy on set_target_power? +

Register the Joulescope MCP server in PolicyLayer and add a rule for set_target_power: 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 Joulescope. Nothing to install.

What risk level is set_target_power? +

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

Can I rate-limit set_target_power? +

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

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

set_target_power is provided by the Joulescope MCP server (juanqui/joulescope-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.