AI agents call estimate_lending_energy 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 is a read-only estimation utility that queries cost data for informational purposes. It does not execute transactions, modify blockchain state, move funds, or trigger irreversible actions. The 'BEFORE executing' phrase confirms it is a pre-flight check. Despite the financial domain (JustLend DAO), the tool itself merely reads/computes estimates and has no side effects.
From the tool's definition Tool name and description indicate it 'Estimate[s]' costs and performs calculations 'BEFORE executing' — it retrieves cost information without modifying state, executing transactions, or committing financial obligations.
Attacks that exploit this kind of access
Estimate energy, bandwidth, and TRX cost for any JustLend operation BEFORE executing it. 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 estimate_lending_energy: 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.
estimate_lending_energy 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 estimate_lending_energy 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 estimate_lending_energy. 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.
estimate_lending_energy 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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