Get historical OHLCV price candles for a stock. Supports daily, weekly, and monthly
AI agents call get_historical_prices to retrieve information from Signal8 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical pricing data without side effects, modification, execution, or financial impact. It is a pure read operation that queries existing market data. While the Signal8 server context involves financial research, this specific tool merely fetches historical price information, which is publicly available data.
From the tool's definition Tool name 'get_historical_prices' and description 'Get historical OHLCV price candles for a stock' indicate data retrieval with no modification or execution capabilities. OHLCV (Open, High, Low, Close, Volume) is standard market data.
Attacks that exploit this kind of access
Get historical OHLCV price candles for a stock. Supports daily, weekly, and monthly. It is categorised as a Read tool in the Signal8 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Signal8 MCP Server MCP server in PolicyLayer and add a rule for get_historical_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 Signal8 MCP Server. Nothing to install.
get_historical_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_historical_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_historical_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_historical_prices is provided by the Signal8 MCP Server MCP server (signal8ai/signal8-mcp). 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.
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