Get 5-day weather forecast for a city.
AI agents call get_weather_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 and returns forecast data without creating, modifying, deleting, or executing any operations. It is a simple query operation with no capability to affect backend systems or data. The blast radius of misuse is minimal—an agent could make repeated requests but cannot cause harm through the tool itself.
From the tool's definition Tool name 'get_weather_forecast' and description 'Get 5-day weather forecast for a city' indicate a retrieval operation with no side effects. Server description confirms it 'provides access to real-time weather data' which is read-only querying.
Attacks that exploit this kind of access
Get 5-day weather forecast for a city. 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_weather_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_weather_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_weather_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_weather_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_weather_forecast is provided by the OpenWeatherMap MCP Server MCP server (mattiaperi/openweathermap-mcp-server). 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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