You need to provide either db_url, db_file or db_engine. The following example uses db_file.
storage.py
from phi.storage.agent.sqlite import SqlAgentStorage# Create a storage backend using the Sqlite databasestorage = SqlAgentStorage( # store sessions in the ai.sessions table table_name="agent_sessions", # db_file: Sqlite database file db_file="tmp/data.db",)# Add storage to the Agentagent = Agent(storage=storage)