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Prompt Versioning & A/B Test
Prompts are code — git, version them, A/B test, keep rollback ready.
2 hours3 resources
Tools: Promptfoo, LangSmith, Helicone, PromptLayer, Langfuse. Version prompts in DB or repo, deploy in percentage rollouts, compare metrics.
Key metrics: accuracy, latency, token cost, user satisfaction, error rate.