AI agents call get_balance_data to retrieve information from A Share without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The naming convention and sibling tools strongly suggest this retrieves balance sheet data from the A-share stock database without side effects. Although the tool description is empty (lowering confidence slightly), the consistent 'get_' prefix across this data-focused MCP server and the nature of financial reporting data (immutable historical records) classify this as a Read operation with low severity.
From the tool's definition Tool name 'get_balance_data' uses the 'get_' prefix pattern consistent with other data retrieval tools on this server (get_all_stock, get_cash_flow_data, get_dividend_data, get_deposit_rate_data, get_adjust_factor_data).
Attacks that exploit this kind of access
get_balance_data. It is categorised as a Read tool in the A Share MCP Server, which means it retrieves data without modifying state.
Register the A Share MCP server in PolicyLayer and add a rule for get_balance_data: 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 A Share. Nothing to install.
get_balance_data 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_data 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_data. 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_data is provided by the A Share MCP server (kissjerryfan/mcp_server). 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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