Tutorial: How to Keep Unspoken AI Responses Out of Voice Companion History

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A developer tutorial on DEV Community addresses a subtle flaw in voice AI companions where partial or undelivered speech gets incorrectly logged into conversation history. Standard implementations append all transcript fragments — including incomplete speech recognition and interrupted model responses — into the next prompt, causing the AI to treat unconfirmed exchanges as established facts. The proposed fix treats conversation history as committed application state, meaning only a finalized user utterance and a fully played-back assistant response are recorded. The tutorial provides a TypeScript implementation enforcing four rules: provisional partial speech, final-only user input, post-playback assistant commits, and rejection of stale interrupted-turn events. The approach is scoped to the current voice session and is designed to integrate with real-time communication platforms such as Tencent RTC alongside OpenAI-compatible model providers.

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