AI agents call get_cheapest_hours to retrieve information from Elpriser without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries historical or forecasted electricity price data to identify optimal time windows for user scheduling decisions. It has no side effects on data or systems—it only reads and returns price information. The use cases mentioned (EV charging scheduling, heat pump scheduling) are user-initiated decisions, not autonomous actions by the tool.
From the tool's definition Tool retrieves and queries data ("Find the N cheapest hours") from electricity price information. No modification, deletion, or execution of external systems occurs. Returns informational data about pricing zones.
Attacks that exploit this kind of access
Find the N cheapest hours of the day for a price zone — for scheduling EV charging, heat pump, dishwasher etc. Use for. It is categorised as a Read tool in the Elpriser MCP Server, which means it retrieves data without modifying state.
Register the Elpriser MCP server in PolicyLayer and add a rule for get_cheapest_hours: 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 Elpriser. Nothing to install.
get_cheapest_hours 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_cheapest_hours 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_cheapest_hours. 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_cheapest_hours is provided by the Elpriser MCP server (x2q/elpriser-mcp). 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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