AI agents call get_time_series_daily to retrieve information from YFinance Trader MCP Tool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description lowering confidence slightly, the tool name and sibling context strongly indicate this retrieves historical time-series stock data without side effects. No writes, deletions, trades, or executions are implied. Classification as Read is appropriate for a data retrieval tool in a financial data context.
From the tool's definition Tool name 'get_time_series_daily' and context of sibling tools (get_company_overview, get_stock_quote, get_recommendations) suggest data retrieval. The yfinance library's primary function is fetching historical stock market data.
Documented attack patterns abuse exactly the kind of access get_time_series_daily gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and YFinance Trader MCP Tool, and nothing reaches the server without passing your rules. This is the rule we recommend for get_time_series_daily:
{
"version": "1",
"default": "deny",
"tools": {
"get_time_series_daily": {}
}
}get_time_series_daily is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_time_series_daily. It is categorised as a Read tool in the YFinance Trader MCP Tool MCP Server, which means it retrieves data without modifying state.
Register the YFinance Trader MCP Tool MCP server in PolicyLayer and add a rule for get_time_series_daily: 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 YFinance Trader MCP Tool. Nothing to install.
get_time_series_daily 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_time_series_daily 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_time_series_daily. 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_time_series_daily is provided by the YFinance Trader MCP Tool MCP server (saintdoresh/yfinance-trader-mcp-claudedesktop). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 YFinance Trader MCP Tool tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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6 YFinance Trader MCP Tool tools catalogued and risk-classified — across an index of 42,500+ MCP servers.