How to Build Your First CrewAI Crew in Python

from dotenv import load_dotenv
from crewai import Agent, Task, Crew, Process

load_dotenv()

# 1. Define agents
researcher = Agent(
    role="Senior Research Analyst",
    goal="Find 5 key facts about {topic}",
    backstory=(
        "You are an analyst known for terse, accurate summaries "
        "and zero hallucinations. You cite sources."
    ),
    verbose=True,
    allow_delegation=False,
    max_iter=5,
)

writer = Agent(
    role="Tech Writer",
    goal="Turn research notes into a 200-word brief",
    backstory=(
        "You write punchy, jargon-light explainers for busy "
        "engineering managers. You avoid filler."
    ),
    verbose=True,
    allow_delegation=False,
    max_iter=5,
)

# 2. Define tasks
research_task = Task(
    description="Research {topic}. List 5 key facts with one-line explanations.",
    expected_output="Markdown bullet list of 5 facts.",
    agent=researcher,
)

writing_task = Task(
    description=(
        "Using the research notes, write a ~200-word brief on {topic} "
        "for an engineering manager. Plain prose, no bullets."
    ),
    expected_output="A single paragraph brief, ~200 words.",
    agent=writer,
    context=[research_task],   # writer sees researcher's output
)

# 3. Wire up the crew
crew = Crew(
    agents=[researcher, writer],
    tasks=[research_task, writing_task],
    process=Process.sequential,
    verbose=True,
)

# 4. Run it
result = crew.kickoff(inputs={"topic": "vector databases"})
print("\n=== FINAL BRIEF ===\n")
print(result)

python3 first_crew.py