Fetch OHLCV historical price data for a stock.
AI agents call get_historical_data to retrieve information from Momentum without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical price data (open, high, low, close, volume) which is informational in nature. It is a read-only query operation with no side effects, no ability to execute code or commands, and no capacity to modify, delete, or move money. Even if used in a trading context, the tool itself only fetches data; it does not execute trades or commit financial obligations.
From the tool's definition Tool name 'get_historical_data' and description 'Fetch OHLCV historical price data for a stock' indicate a data retrieval operation with no modification, creation, deletion, execution, or financial transaction capability.
Documented attack patterns abuse exactly the kind of access get_historical_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Momentum, and nothing reaches the server without passing your rules. This is the rule we recommend for get_historical_data:
{
"version": "1",
"default": "deny",
"tools": {
"get_historical_data": {}
}
}get_historical_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch OHLCV historical price data for a stock. It is categorised as a Read tool in the Momentum MCP Server, which means it retrieves data without modifying state.
Register the Momentum MCP server in PolicyLayer and add a rule for get_historical_data: 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 Momentum. Nothing to install.
get_historical_data 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_data 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_data. 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_data is provided by the Momentum MCP server (mphinance/momentum-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Momentum, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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52 Momentum tools catalogued and risk-classified — across an index of 43,000+ MCP servers.