Spec Driven Workflow with Claude Code #4 - Implementing the Plan
•February 20, 2026
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Why It Matters
By leveraging Claude Code’s spec‑driven, model‑aware workflow, developers can prototype and ship features faster while maintaining code quality, reshaping traditional development cycles.
Key Takeaways
- •Switch to Opus 4.5 for complex plan implementation
- •Enable extended thinking mode for deeper multi-step reasoning
- •Autoedit mode accelerates code generation and iterative fixes
- •Review generated components manually before committing changes to ensure quality
- •Commit, merge, and stage feature using Claude Code workflow
Summary
Claude Code’s fourth tutorial walks through turning a detailed plan into working authentication components. The presenter switches from the default Sonic model to Opus 4.5, noting its superior instruction‑following ability, and enables extended thinking mode to let the model reason longer on complex tasks. Auto‑edit is also turned on to let Claude apply changes automatically.
Key technical choices are explained: Opus 4.5 for multi‑step features, thinking mode (toggled via config or the shortcut Alt + T/Option + T), and the “ultraink” keyword to trigger extended reasoning for a single prompt. The model reads the plan, generates React button, input, login and signup forms, creates corresponding test files, fixes a lint error, and runs the tests—all within a few minutes.
The video highlights concrete outputs: a button component with type props, an input group with label handling, a password field that toggles visibility via an eye icon, and passing tests. The presenter manually inspects the files, runs the app in a browser to verify UI behavior, then stages, commits, and merges the feature branch using Git commands inside the Claude chat.
The workflow demonstrates how AI can automate repetitive coding while still requiring developer oversight. By combining spec‑driven prompts, model selection, and extended reasoning, teams can accelerate feature delivery, reduce human error, and keep token budgets in check, paving the way for tighter CI/CD pipelines.
Original Description
in this series, you'll learn how to implement a spec-driven workflow using Claude Code.
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