Get 30-year climate normal values for a NOAA weather station. Climate normals are averages computed over the most recent 30-year period (currently 1991-2020). They represent typical conditions for a location and are useful for comparing current conditions to historical baselines. Args: station_id...
Part of the NOAA Climate Data server.
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AI agents call get_climate_normals to retrieve information from NOAA Climate Data without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_climate_normals only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_climate_normals": {}
}
}See the full NOAA Climate Data policy for all 3 tools.
These attack patterns abuse exactly the kind of access get_climate_normals gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get 30-year climate normal values for a NOAA weather station. Climate normals are averages computed over the most recent 30-year period (currently 1991-2020). They represent typical conditions for a location and are useful for comparing current conditions to historical baselines. Args: station_id: NOAA station identifier (e.g. 'GHCND:USW00094728'). Use find_stations to look up station IDs. data_types: Comma-separated normal data type IDs to filter. Common types: DLY-TMAX-NORMAL (avg daily max temp), DLY-TMIN-NORMAL (avg daily min temp), DLY-TAVG-NORMAL (avg daily temp), DLY-PRCP-PCTALL-GE001HI (precip probability), MTD-PRCP-NORMAL (monthly precip), ANN-TMAX-NORMAL (annual max temp). If omitted, all available normals are returned.. It is categorised as a Read tool in the NOAA Climate Data MCP Server, which means it retrieves data without modifying state.
Register the NOAA Climate Data MCP server in PolicyLayer and add a rule for get_climate_normals: 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 NOAA Climate Data. Nothing to install.
get_climate_normals 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_climate_normals 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_climate_normals. 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_climate_normals is provided by the NOAA Climate Data MCP server (https://mcp.olyport.com/noaa-climate/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 NOAA Climate Data tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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