Get current weather for a city using Open-Meteo API (free, no API key required).
AI agents call get_weather_tool to retrieve information from Modular MCP Server with Python Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries external weather data and returns it to the user. There are no side effects, no data modification, no code execution triggered by arguments, and no financial impact. It is a straightforward read operation with minimal blast radius if misused (e.g., repeated queries would only cause minor API load, not data loss or unauthorized actions).
From the tool's definition Tool description states it 'Get[s] current weather for a city' - a data retrieval operation with no modification, deletion, or execution capabilities. The Open-Meteo API interaction is read-only.
Attacks that exploit this kind of access
Get current weather for a city using Open-Meteo API (free, no API key required). It is categorised as a Read tool in the Modular MCP Server with Python Tools MCP Server, which means it retrieves data without modifying state.
Register the Modular MCP Server with Python Tools MCP server in PolicyLayer and add a rule for get_weather_tool: 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 Modular MCP Server with Python Tools. Nothing to install.
get_weather_tool 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_tool 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_tool. 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_tool is provided by the Modular MCP Server with Python Tools MCP server (tunamsyar/ollama-mcp-py). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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