My top three pieces of advice for people getting started with voice agents.
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Spend time up front understanding why latency and instruction following accuracy drive voice AI tech choices.
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You will need to add significant tooling complexity as you go from proof of concept to production. Prepare for that. Especially important: build lightweight evals as early as you can.
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The right path is: start with a proven, "best practices" tech stack -> get everything working one piece at a time -> deploy to real-world users and collect data -> then think about optimizing cost/latency/etc.