export LANGFUSE_SECRET_KEY=sk-lf-...
export LANGFUSE_PUBLIC_KEY=pk-lf-...
export LANGFUSE_HOST=https://cloud.langfuse.com  # optional

import { Agent, Agents, setObservabilityAdapter } from 'praisonai';
import { LangfuseObservabilityAdapter } from 'praisonai/observability';

const obs = new LangfuseObservabilityAdapter();
await obs.initialize();
setObservabilityAdapter(obs);

const researcher = new Agent({
  name: 'Researcher',
  instructions: 'Research topics.',
  llm: 'openai/gpt-4o'
});

const writer = new Agent({
  name: 'Writer',
  instructions: 'Write summaries.',
  llm: 'openai/gpt-4o-mini'
});

const agents = new AgentTeam({
  agents: [researcher, writer],
  tasks: [
    { agent: researcher, description: 'Research {topic}' },
    { agent: writer, description: 'Summarize findings' }
  ]
});

await agents.start({ topic: 'AI trends' });
await obs.flush();

Error: Langfuse SDK not available