set_battery_charge · Alpha ESS MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_battery_charge does on Alpha ESS MCP Server

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

WHY IT NEEDS A POLICY

Why set_battery_charge needs a policy

Based on the tool name and server context, this tool likely configures battery charging schedules or parameters on a physical energy storage system. This is a Write operation (modifying configuration), but it has high severity since misconfiguration of battery charging on a real solar/battery system could cause physical damage or energy waste.

From the tool's definition Tool name 'set_battery_charge' implies writing/modifying battery charge configuration; description is empty and uninformative

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_battery_charge Rate-limited

set_battery_charge 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_battery_charge": {
      "limits": [
        {
          "counter": "set_battery_charge_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 Alpha ESS MCP Server, so you can run agents against it safely.

FAQ

Questions about set_battery_charge

What does the set_battery_charge tool do? +

set_battery_charge. It is categorised as a Write tool in the Alpha ESS MCP Server 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_battery_charge? +

Register the Alpha ESS MCP Server MCP server in PolicyLayer and add a rule for set_battery_charge: 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 Alpha ESS MCP Server. Nothing to install.

What risk level is set_battery_charge? +

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

Can I rate-limit set_battery_charge? +

Yes. Add a rate_limit block to the set_battery_charge 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_battery_charge completely? +

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

set_battery_charge is provided by the Alpha ESS MCP Server MCP server (michaelkrasa/alpha-ess-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.