AI agents call get_trx_balance 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 performs a straightforward balance query on the TRON blockchain. It retrieves information (the TRX balance associated with a given address) without side effects, state changes, or execution of arbitrary code. This is a classic Read operation with minimal risk—at worst, an agent could query balances for reconnaissance, but no funds, contracts, or data are at risk of modification or loss.
From the tool's definition Tool name 'get_trx_balance' and description 'Get TRX balance for an address' indicate a read-only query operation that retrieves balance data without modifying state or triggering external operations.
Attacks that exploit this kind of access
Get TRX balance for an address. 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_trx_balance: 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_trx_balance 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_trx_balance 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_trx_balance. 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_trx_balance 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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