set_supply_voltage · Pymcuprog MCP: Risk & Policy

WHAT IT DOES

What set_supply_voltage does on Pymcuprog

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

WHY IT NEEDS A POLICY

Why set_supply_voltage needs a policy

This tool modifies a hardware configuration — the supply voltage level output by the debugger. While it is a 'set' (write) operation rather than destructive, misconfiguring the supply voltage could damage connected microcontrollers or hardware (e.g., applying 5V to a 3.3V-only device), giving it high severity. It does not delete data, execute code, or involve finances, so Write is the most appropriate category.

From the tool's definition Set the debugger's onboard supply voltage output (e.g. 3.3 or 5.0)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_supply_voltage Rate-limited

set_supply_voltage 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_supply_voltage": {
      "limits": [
        {
          "counter": "set_supply_voltage_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 Pymcuprog, so you can run agents against it safely.

FAQ

Questions about set_supply_voltage

What does the set_supply_voltage tool do? +

Set the debugger's onboard supply voltage output (e.g. 3.3 or 5.0). It is categorised as a Write tool in the Pymcuprog 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_supply_voltage? +

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

What risk level is set_supply_voltage? +

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

Can I rate-limit set_supply_voltage? +

Yes. Add a rate_limit block to the set_supply_voltage 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_supply_voltage completely? +

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

set_supply_voltage is provided by the Pymcuprog MCP server (lucasgerads/pymcuprog-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.