get_watchlist_prices
AI agents call get_watchlist_prices to retrieve information from MCP YFinance Stock Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to retrieve current or cached price data for stocks on a user's watchlist. It performs a read operation with no side effects—no data is modified, deleted, or financial transactions executed. Even if an AI agent misuses this by retrieving watchlist data it shouldn't access, the blast radius is limited to information disclosure. Severity is low because stock price data is typically public information.
From the tool's definition Tool name 'get_watchlist_prices' indicates retrieval of existing watchlist price data. Sibling tools like 'get_bollinger_bands', 'get_historical_stock_prices', 'get_macd', 'get_moving_averages', and 'get_rsi' are all data retrieval functions.
Attacks that exploit this kind of access
get_watchlist_prices. It is categorised as a Read tool in the MCP YFinance Stock Server MCP Server, which means it retrieves data without modifying state.
Register the MCP YFinance Stock Server MCP server in PolicyLayer and add a rule for get_watchlist_prices: 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 MCP YFinance Stock Server. Nothing to install.
get_watchlist_prices 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_watchlist_prices 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_watchlist_prices. 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_watchlist_prices is provided by the MCP YFinance Stock Server MCP server (sauniket/mcp-yfinance-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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