This record as markdown: /tools/firebase-genkit/weather.md
What weather does on Genkit MCP
AI agents call weather to retrieve information from Genkit MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why weather is rated Low
The tool retrieves weather information for a specified city. This is a read-only query that does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal, as returning incorrect or fabricated weather data poses no direct risk to systems, finances, or data integrity. Severity is low because the worst outcome is providing inaccurate weather information.
From the tool's definition Tool name is 'weather' and description states 'Get the weather for a city' — this is a data retrieval operation with no side effects.
Attacks that exploit this kind of access
The rule that runs weather safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Genkit MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For weather, this is the rule to start with:
weather is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Genkit MCP, apply this rule, and every weather call is checked against it from then on.
Questions about weather
Get the weather for a city. It is categorised as a Read tool in the Genkit MCP MCP Server, which means it retrieves data without modifying state.
Register the Genkit 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 Genkit MCP. 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 Genkit MCP server (genkit-ai/genkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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