AI agents call weather to retrieve information from Demo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool fetches and returns weather information without modifying, deleting, or executing any code. It is a simple read-only query to an external weather service. The operation has no side effects, no destructive potential, and no financial implications. Severity is low because misuse would only result in excessive API calls or information disclosure of public weather data.
From the tool's definition Tool name 'weather' and description 'Return current weather for a city using wttr.in' indicates a retrieval operation that queries external weather data with no side effects.
Attacks that exploit this kind of access
Return current weather for a city using wttr.in. It is categorised as a Read tool in the Demo MCP Server, which means it retrieves data without modifying state.
Register the Demo MCP server in PolicyLayer and add a rule for weather: 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 Demo. Nothing to install.
weather 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 weather 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 weather. 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.
weather is provided by the Demo MCP server (penguinszp001/mcp-server-demo). 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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