--- title: "WWDC26: Debug and profile agentic app experiences with Instruments | Apple" url: https://daily.dev/posts/wwdc26-debug-and-profile-agentic-app-experiences-with-instruments-apple-py9kmbadm source_url: https://www.youtube.com/watch?v=ML67J6l8NLs type: video:youtube source: "Apple Developer" published: 2026-06-08T21:25:22.475Z updated: 2026-06-08T21:26:05.907Z tags: ["ai", "llm", "agentic-ai"] reading_time: 14 upvotes: 0 comments: 0 language: 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. # WWDC26: Debug and profile agentic app experiences with Instruments | Apple **[Apple Developer](https://daily.dev/sources/appledeveloper)** · 14 min read · 0 upvotes · 0 comments ## Summary A WWDC26 session walkthrough on using Apple's Instruments tool to debug and profile agentic app experiences built with the Foundation Models framework. Covers the key challenges of LLM app development (probabilistic output, model-to-model communication, observability), demonstrates a real debugging scenario in a crafting app where a missing tool in DynamicInstructions caused a silent failure, and explains how to use the Foundation Models Instrument's timeline, tree view, and performance metrics (Time to First Token, Tokens per Second, Total Latency) to identify and fix issues. Requires Xcode 27 and latest OS releases. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#ai](https://daily.dev/tags/ai), [#llm](https://daily.dev/tags/llm), [#agentic-ai](https://daily.dev/tags/agentic-ai) [View this post on daily.dev](https://daily.dev/posts/wwdc26-debug-and-profile-agentic-app-experiences-with-instruments-apple-py9kmbadm)