You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "alerts_parameters", "description": "Fetches a list of weather alerts from the National Weather Service API, with optional filtering parameters.", "parameters": {"start": {"description": "Start time in ISO8601 format.", "type": "str, optional", "default": ""}, "end": {"description": "End time in ISO8601 format.", "type": "str, optional", "default": ""}, "status": {"description": "Event status (e.g., alert, update, cancel).", "type": "str, optional", "default": ""}, "zone_type": {"description": "Zone type (e.g., land, marine).", "type": "str, optional", "default": ""}, "active": {"description": "Active alerts indicator (1 for active, 0 for inactive).", "type": "str, optional", "default": ""}, "type": {"description": "Zone type (e.g., land, marine).", "type": "str, optional", "default": ""}, "point": {"description": "Geographic point in \"latitude,longitude\" format.", "type": "str, optional", "default": ""}, "state": {"description": "State or marine code.", "type": "str, optional", "default": ""}, "zone": {"description": "Zone ID for forecast or county.", "type": "str, optional", "default": ""}, "urgency": {"description": "Urgency of the alert (e.g., expected, immediate).", "type": "str, optional", "default": ""}, "region": {"description": "Region code.", "type": "str, optional", "default": ""}, "certainty": {"description": "Certainty of the event (e.g., likely, observed).", "type": "str, optional", "default": ""}, "severity": {"description": "Severity of the event (e.g., minor, moderate, severe).", "type": "str, optional", "default": ""}, "limit": {"description": "Limit the number of results (integer).", "type": "str, optional", "default": ""}}}]
I need to know the severe weather alerts for a specific point, latitude 37.7749, longitude -122.4194, with urgency 'immediate' and severity 'severe'.
user
assistant
[{"name": "alerts_parameters", "arguments": {"point": "37.7749,-122.4194", "urgency": "immediate", "severity": "severe"}}]