Set the maximum charge percentage for a vehicle battery (50–100%)
AI agents use set_charge_limit to commit financial operations through Smartcar MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
set_charge_limit 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.
Attacks that exploit this kind of access
Set the maximum charge percentage for a vehicle battery (50–100%). It is categorised as a Financial tool in the Smartcar MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Smartcar MCP Server MCP server in PolicyLayer and add a rule for set_charge_limit: 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 Smartcar MCP Server. Nothing to install.
set_charge_limit is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the set_charge_limit 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.
Set action: deny in the PolicyLayer policy for set_charge_limit. 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.
set_charge_limit is provided by the Smartcar MCP Server MCP server (thachdosc/smartcar-mcp-test). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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