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A pragmatic guide to AI-assisted development

AnnouncementProductOct 19, 2026

A developer used Claude Code with Opus 5.5 in the Claude desktop app to fix a bug in thoughtbot's internal scheduling tool, Hub, where "Highlighted abilities" cards ignored employees' interest levels. The tutorial outlines a workflow: ensuring the agent can run the app, reproducing the bug, asking naive questions, tracing behavior, and using a Socratic quiz before implementation. The author concludes the fix belongs on the profile, not matching logic.

Why it matters

A thoughtbot developer working in an unfamiliar codebase used Claude Code with Opus 5.5 to fix a bug in Hub, the firm's internal scheduling tool. Hub lets employees record experience and interest levels for skills, which appear on profiles and inform staffing decisions. The bug: the "Highlighted abilities" card featured skills without regard to interest, so an employee highly experienced in iOS but strongly opposed to that work was still highlighted, and someone likely picked him for an iOS project based on the starred skill. The developer's workflow emphasizes understanding over coding: ensuring the agent can run the app, loading the issue in a fresh session, reproducing the bug locally, asking naive questions, tracing how opportunities are matched, and having the model quiz him Socratically before writing a spec. Tracing revealed the matching job already skips opposed employees, so the fix belonged on the profile display rather than in matching logic. The piece matters as a practical template for verification-first, AI-assisted debugging.

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Evidence

1source· awaiting independent confirmation

No score is assigned. Sources and their independence are shown in the citation chain below.

Citation chain · 1 source

01med
thoughtbot.comBloghttps://thoughtbot.com/blog/a-pragmatic-guide-to-ai-assisted-developmentThis source is a firsthand developer tutorial detailing a verification-first workflow with Claude Code and Opus 5.5, including prompts, skills, and a Socratic quiz that reshaped the fix.
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Claude CodeModelOpus 5.5Model

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Canonical: https://thoughtbot.com/blog/a-pragmatic-guide-to-ai-assisted-development