Retrieve the annual balance sheet of a company.
AI agents call get_balance_sheet to retrieve information from Yahoo Finance MCP Server 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 historical financial data (a company's balance sheet) from Yahoo Finance. It performs no writes, deletions, code execution, or financial transactions. It is a straightforward data retrieval operation with no blast radius if misused by an AI agent—the worst outcome would be retrieving data about the wrong company, which causes no harm.
From the tool's definition Tool name is 'get_balance_sheet' and description states it 'Retrieve[s] the annual balance sheet of a company.' The verb 'retrieve' indicates read-only data access with no mutation or side effects.
Attacks that exploit this kind of access
Retrieve the annual balance sheet of a company. It is categorised as a Read tool in the Yahoo Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP Server MCP server in PolicyLayer and add a rule for get_balance_sheet: 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 Yahoo Finance MCP Server. Nothing to install.
get_balance_sheet 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_sheet 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_sheet. 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_sheet is provided by the Yahoo Finance MCP Server MCP server (peidaqi/yfinance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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