CrewAI

Install (CrewAI 1.15+ required):

shell

pip install "nullrun[crewai]"

The current patch subscribes to the crewai EventBus and translates each lifecycle event into a runtime.track_event call.

crewai_crew.py

import nullrun
from crewai import Agent, Crew, Task

nullrun.init(api_key="nr_live_...")

researcher = Agent(
    role="Researcher",
    goal="Answer the question",
    backstory="Concise and accurate.",
)

task = Task(
    description="What does NullRun do?",
    agent=researcher,
    expected_output="Two sentences.",
)

crew = Crew(agents=[researcher], tasks=[task])
result = crew.kickoff()

The CrewAI integration automatically tracks crew / agent / task / tool lifecycle events. Token totals still come from the crew's usage metrics after kickoff — the SDK reports the canonical (model, prompt_tokens, completion_tokens) tuple on every billable row.

When crewai's events module is not importable (pre-1.15 crewai or a stripped-down third-party build), only the per-event span bridge is skipped; the post-run cost attribution still works.

See also

• LLM frameworks
• Quickstart