AI agents call get_balance to retrieve information from Xendit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data (account balance) with no side effects. It does not create, modify, delete, or transfer money. While it accesses sensitive financial information, the action itself is read-only. Severity is low because misuse would only expose information rather than cause financial loss or enable fund transfers.
From the tool's definition Tool name 'get_balance' and description 'Get account balance' indicate a query operation that retrieves financial account information without modifying or moving funds.
Attacks that exploit this kind of access
Get account balance. It is categorised as a Read tool in the Xendit MCP Server, which means it retrieves data without modifying state.
Register the Xendit MCP server in PolicyLayer and add a rule for get_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 Xendit. Nothing to install.
get_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_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_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_balance is provided by the Xendit MCP server (theyahia/xendit-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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