Get the current value of a single vehicle signal by its code.
AI agents call get_signal to retrieve information from Smartcar MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries vehicle telemetry data (a signal value) without creating, modifying, deleting, or executing commands. It has minimal blast radius—an agent misusing it could only retrieve vehicle data like speed, battery level, or location, but cannot control the vehicle or cause irreversible harm. Classified as Read with low severity.
From the tool's definition Tool name 'get_signal' combined with description 'Get the current value of a single vehicle signal by its code' indicates a retrieval operation with no modification or side effects. The verb 'Get' and phrase 'current value' confirm read-only telemetry access.
Attacks that exploit this kind of access
Get the current value of a single vehicle signal by its code. It is categorised as a Read tool in the Smartcar MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Smartcar MCP Server MCP server in PolicyLayer and add a rule for get_signal: 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.
get_signal is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_signal 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 get_signal. 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.
get_signal 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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