--- title: Your AI Voice Agent Is a Black Box. Here’s How to Open It. description: AI voice agents produce rich call recordings, but standard observability tools like LangChain and LangSmith only see tokens — not audio. This post introduces a... canonical: https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Your AI Voice Agent Is a Black Box. Here’s How to Open It. | daily.dev og:description: AI voice agents produce rich call recordings, but standard observability tools like LangChain and LangSmith only see tokens — not audio. This post introduces a... og:url: https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy og:image: https://api.daily.dev/og/posts/0Slfkjjqy.png og:image:alt: Your AI Voice Agent Is a Black Box. Here’s How to Open It. og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Your AI Voice Agent Is a Black Box. Here’s How to Open It. **[ITNEXT](https://daily.dev/sources/itnext)** · 5 min read · 0 upvotes · 0 comments ## Summary AI voice agents produce rich call recordings, but standard observability tools like LangChain and LangSmith only see tokens — not audio. This post introduces a mental model for extracting structured signals from call recordings by splitting analysis into two layers: classical signal processing for physical measurements (silence, pace, pitch) and learned models for semantic meaning (transcripts, sentiment, intent). The author presents AudioTrace, an open-source Python library that runs locally, analyzes a call recording, and returns a typed Pydantic report covering quality, sentiment, latency, cost, and events — compatible with OpenTelemetry, LangSmith traces, and CI pipelines. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#observability](https://daily.dev/tags/observability), [#langchain](https://daily.dev/tags/langchain), [#audio-processing](https://daily.dev/tags/audio-processing), [#langsmith](https://daily.dev/tags/langsmith) [View this post on daily.dev](https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Your AI Voice Agent Is a Black Box. Here’s How to Open It.","url":"https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy"},"datePublished":"2026-07-14T21:10:50.235Z","dateModified":"2026-07-14T22:04:33.902Z","description":"AI voice agents produce rich call recordings, but standard observability tools like LangChain and LangSmith only see tokens — not audio. This post introduces a...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/b2b068d61cad7aabb3d9c2626f27f47a?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/b2b068d61cad7aabb3d9c2626f27f47a?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"ITNEXT","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ITNEXT","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/itnext2","url":"https://daily.dev/sources/itnext"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/your-ai-voice-agent-is-a-black-box-here-s-how-to-open-it--0slfkjjqy","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"observability,langchain,audio-processing,langsmith","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ITNEXT","item":"https://daily.dev/sources/itnext"},{"@type":"ListItem","position":3,"name":"Your AI Voice Agent Is a Black Box. Here’s How to Open It."}]} ```