add_battery_source

Add a battery source to the Energy Dashboard (both charge stat_energy_to and discharge stat_energy_from).

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/fistacho-ha-nexus-agent/add-battery-source.md

WHAT IT DOES

What add_battery_source does on Ha Nexus Agent

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

RISK

Why add_battery_source is rated Medium

This tool creates or modifies dashboard configuration reversibly by adding a battery source with charge and discharge statistics. While it affects home energy monitoring (a non-trivial system), it is not destructive (reversible), does not execute arbitrary code, and does not move money.

From the tool's definition Tool description states 'Add a battery source to the Energy Dashboard' — the verb 'Add' and the action of modifying dashboard configuration by inserting a new battery source entity indicate data creation/modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_battery_source safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ha Nexus Agent, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_battery_source, this is the rule to start with:

add_battery_source Rate-limited

add_battery_source 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": {
    "add_battery_source": {
      "limits": [
        {
          "counter": "add_battery_source_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ha Nexus Agent, apply this rule, and every add_battery_source call is checked against it from then on.

FAQ

Questions about add_battery_source

What does the add_battery_source tool do? +

Add a battery source to the Energy Dashboard (both charge stat_energy_to and discharge stat_energy_from). It is categorised as a Write tool in the Ha Nexus 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 add_battery_source? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for add_battery_source: 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 Ha Nexus Agent. Nothing to install.

What risk level is add_battery_source? +

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

Can I rate-limit add_battery_source? +

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

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

add_battery_source is provided by the Ha Nexus Agent MCP server (fistacho/ha-nexus-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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