--- title: How to Debug AI Coding Agents When They Change the Wrong... description: AI coding agents often return vague success messages like 'fixed' without providing evidence of what they actually changed. This tutorial demonstrates a... canonical: https://daily.dev/posts/how-to-debug-ai-coding-agents-when-they-change-the-wrong-thing-f9znhzoc8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How to Debug AI Coding Agents When They Change the Wrong Thing | daily.dev og:description: AI coding agents often return vague success messages like 'fixed' without providing evidence of what they actually changed. This tutorial demonstrates a... og:url: https://daily.dev/posts/how-to-debug-ai-coding-agents-when-they-change-the-wrong-thing-f9znhzoc8 og:image: https://api.daily.dev/og/posts/F9znHZOc8.png og:image:alt: How to Debug AI Coding Agents When They Change the Wrong Thing 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. # How to Debug AI Coding Agents When They Change the Wrong Thing **[Towards Data Science](https://daily.dev/sources/tds)** · 14 min read · 1 upvotes · 0 comments ## Summary AI coding agents often return vague success messages like 'fixed' without providing evidence of what they actually changed. This tutorial demonstrates a pattern for recording and verifying agent actions using a Python wrapper that logs every tool request and result. Using a CSS overflow bug in a pricing card as the example, it shows how to capture file reads, patches, build output, DOM measurements, and before/after screenshots. The run log exposes wrong selector attempts, skipped checks, and other failure modes invisible in the final code. The pattern generalizes beyond UI fixes to API bugs, test failures, database changes, and refactors by swapping the verification tool while keeping the same evidence structure. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [How to Debug Python Code With an AI Agent – Real Python](https://daily.dev/posts/how-to-debug-python-code-with-an-ai-agent-real-python-m3fac62my) · Real Python · 1 upvotes · 0 comments - [3 Techniques to Effectively Utilize AI Agents for Coding](https://daily.dev/posts/3-techniques-to-effectively-utilize-ai-agents-for-coding-atdhklbf0) · Towards Data Science · 1 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#mcp](https://daily.dev/tags/mcp) [View this post on daily.dev](https://daily.dev/posts/how-to-debug-ai-coding-agents-when-they-change-the-wrong-thing-f9znhzoc8) ```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":"How to Debug AI Coding Agents When They Change the Wrong Thing","url":"https://daily.dev/posts/how-to-debug-ai-coding-agents-when-they-change-the-wrong-thing-f9znhzoc8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-to-debug-ai-coding-agents-when-they-change-the-wrong-thing-f9znhzoc8"},"datePublished":"2026-07-31T13:56:44.119Z","dateModified":"2026-08-03T02:18:25.405Z","description":"AI coding agents often return vague success messages like 'fixed' without providing evidence of what they actually changed. 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