AI agents call get_forecast to retrieve information from OpenWeatherMap 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 forecast data with no side effects, no code execution, and no data modification. It fits the Read category. Severity is low because misuse (e.g., requesting excessive forecasts) has minimal security impact—no financial, destructive, or operational harm.
From the tool's definition Tool name 'get_forecast' on a weather data server; sibling tools include 'get_current_weather' and 'get_air_quality', all of which are read-only data retrieval operations.
Documented attack patterns abuse exactly the kind of access get_forecast gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OpenWeatherMap MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_forecast:
{
"version": "1",
"default": "deny",
"tools": {
"get_forecast": {}
}
}get_forecast is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_forecast. It is categorised as a Read tool in the OpenWeatherMap MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenWeatherMap MCP Server MCP server in PolicyLayer and add a rule for get_forecast: 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 OpenWeatherMap MCP Server. Nothing to install.
get_forecast 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_forecast 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_forecast. 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_forecast is provided by the OpenWeatherMap MCP Server MCP server (jezweb/weather-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OpenWeatherMap MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 OpenWeatherMap MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.