Get historical OHLCV (Open, High, Low, Close, Volume) price data
AI agents call get_historical to retrieve information from Yahoo Finance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical financial data without any side effects. It queries existing price information and returns it without creating, modifying, deleting, or executing anything. This is a straightforward read operation with minimal risk if misused—an agent could only access publicly available historical market data.
From the tool's definition Tool name 'get_historical' and description 'Get historical OHLCV (Open, High, Low, Close, Volume) price data' indicate pure data retrieval with no modification, deletion, or execution.
Attacks that exploit this kind of access
Get historical OHLCV (Open, High, Low, Close, Volume) price data. It is categorised as a Read tool in the Yahoo Finance MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP server in PolicyLayer and add a rule for get_historical: 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. Nothing to install.
get_historical 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_historical 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_historical. 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_historical is provided by the Yahoo Finance MCP server (nrempel/yahoo-finance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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