Query HBAR and token balances for any Hedera account. RETURNS: HBAR balance in ℏ format, list of all associated token balances FREE: No transaction fee (Mirror Node query) USE FOR: Checking account balances, monitoring funds, verifying token holdings.
AI agents call account_balance to retrieve information from HashPilot without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves account balance information from the Hedera blockchain without creating, modifying, deleting, or executing any operations. It is a passive query operation that returns data only. The explicit mention of 'Mirror Node query' and lack of transaction fees confirms no state-changing operations occur. This is a classic Read category tool with minimal risk if misused.
From the tool's definition Tool description states 'Query HBAR and token balances' and 'No transaction fee (Mirror Node query)', indicating read-only access to blockchain data without side effects.
Attacks that exploit this kind of access
Query HBAR and token balances for any Hedera account. RETURNS: HBAR balance in ℏ format, list of all associated token balances FREE: No transaction fee (Mirror Node query) USE FOR: Checking account balances, monitoring funds, verifying token holdings. It is categorised as a Read tool in the HashPilot MCP Server, which means it retrieves data without modifying state.
Register the HashPilot MCP server in PolicyLayer and add a rule for account_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 HashPilot. Nothing to install.
account_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 account_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 account_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.
account_balance is provided by the HashPilot MCP server (justmert/hashpilot). 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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