AI agents call get_energy_rental_params to retrieve information from Justlend without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries blockchain state to retrieve configuration parameters. It performs no writes, executes no code, transfers no funds, and deletes nothing. The 'get' verb and 'Get on-chain' phrasing confirm it is a read-only operation. Even if accessed by a compromised agent, the worst outcome is information disclosure, which has minimal impact.
From the tool's definition Tool name 'get_energy_rental_params' and description 'Get on-chain energy rental parameters' indicate a retrieval operation with no side effects. Returns read-only data about liquidation thresholds, fee ratios, and minimum fees.
Attacks that exploit this kind of access
Get on-chain energy rental parameters: liquidation threshold, fee ratio, min fee,. It is categorised as a Read tool in the Justlend MCP Server, which means it retrieves data without modifying state.
Register the Justlend MCP server in PolicyLayer and add a rule for get_energy_rental_params: 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 Justlend. Nothing to install.
get_energy_rental_params 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_energy_rental_params 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_energy_rental_params. 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_energy_rental_params is provided by the Justlend MCP server (justlend/mcp-server-justlend). 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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