charge_battery

THE RISK

Critical Risk

charge_battery moves real money, and an autonomous agent will call it with the same confidence it calls a search tool. A misread instruction or an injected prompt is all it takes to drain an account or blow a budget.

Documented attack patterns abuse exactly the kind of access charge_battery gives an agent:

HOW TO CONTROL CHARGE_BATTERY

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Grocy API, and nothing reaches the server without passing your rules. This is the rule we recommend for charge_battery:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "charge_battery": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to charge_battery is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register MCP Grocy API — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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Free to start. No card required.

EXPLORE

More MCP Grocy API tools

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All 37 MCP Grocy API tools →

Financial tools on other servers

Atv build_deposit_tx Bitcoin MCP Server pay_invoice AbraFlexi bank_transaction_create Hilanet MCP decrease_coworker_salary

Go deeper

Critical-risk tools in MCP Grocy API → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

What does the charge_battery tool do? +

Track charging of a battery in your Grocy instance. It is categorised as a Financial tool in the MCP Grocy API MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on charge_battery? +

Register the MCP Grocy API MCP server in PolicyLayer and add a rule for charge_battery: 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 MCP Grocy API. Nothing to install.

What risk level is charge_battery? +

charge_battery is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit charge_battery? +

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

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

charge_battery is provided by the MCP Grocy API MCP server (saya6k/mcp-grocy-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Grocy API tool call.

Deterministic rules across all 37 MCP Grocy API tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT CHARGE_BATTERY ON MCP GROCY API DOES

// THE RISK

// HOW TO CONTROL CHARGE_BATTERY

// EXPLORE