AI agents call get-historical-data to retrieve information from Weather & Stock 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 stock price data (Open, High, Low, Close values) without modifying any data, executing code, or triggering external operations. It is a query/fetch operation with no side effects, fitting the Read category. The severity is low because misuse would only result in unauthorized data access, not financial transactions or destructive actions.
From the tool's definition Tool name is 'get-historical-data' and description states 'Fetch historical OHLC data' — both indicate a retrieval operation with no modification or execution.
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 Weather & Stock MCP Server, 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 historical OHLC data. It is categorised as a Read tool in the Weather & Stock MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Weather & Stock MCP Server 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 Weather & Stock MCP Server. 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 Weather & Stock MCP Server MCP server (jeetinida/stocknews-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Weather & Stock MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 Weather & Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.