from letta import Agent, Tool, MemoryStore, Planner, Critic
from tools import fetch_weather, search_flights, fetch_hotels
memory = MemoryStore(persist=True)
weather_tool = Tool(
name="fetch_weather",
schema={"city": "string"},
func=fetch_weather,
retries=2)
planner = Planner(
max_steps=6,
enforce_plan=True,
template="""
Goal: {goal}
Plan: Break into phases: research → compare → propose. Limit steps.
Must call tools for factual data. Avoid speculation.
"""
)
critic = Critic(
rules=["If response contains numbers, cite source or tool output",
"Abort if more than 6 steps or repeated tool call with same inputs",
]
)
agent = Agent(
name="TripPlanner",
tools=[weather_tool, search_flights, fetch_hotels],
memory=memory,
planner=planner,
critic=critic,
observability={"trace": True, "cost": True})
response = agent.run(goal="Plan a 3-day trip to Lisbon under $800")
print(response)