AI agents call get_cash_balances to retrieve information from KSEI MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing financial data (cash balances) from a portfolio management system. It performs no write, execute, destructive, or financial transaction operations. While the data retrieved may be financially sensitive, the tool itself only reads and does not move money, execute code, or modify state.
From the tool's definition Tool name is 'get_cash_balances' and description states 'Get detailed cash balances' — the verb 'Get' and 'detailed' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get detailed cash balances across all securities companies. It is categorised as a Read tool in the KSEI MCP MCP Server, which means it retrieves data without modifying state.
Register the KSEI MCP server in PolicyLayer and add a rule for get_cash_balances: 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 KSEI MCP. Nothing to install.
get_cash_balances 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_cash_balances 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_cash_balances. 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_cash_balances is provided by the KSEI MCP server (nichsedge/ksei-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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