OpenSpec (Spec-Driven Development) Failed My Experiment — Instructions.md Was Simpler and Faster

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OpenSpec's Spec-Driven Development approach failed an experiment due to complexity, while a simpler Instructions.md file achieved faster results

intermediate Published 1 Apr 2026
Action Steps
  1. Evaluate the complexity of your project to determine the best approach
  2. Consider using a simple Instructions.md file for smaller projects
  3. Experiment with Spec-Driven Development frameworks like OpenSpec for larger projects
  4. Assess the results and adjust your approach accordingly
Who Needs to Know This

Developers and software engineers on a team can benefit from understanding the trade-offs between Vibe Coding and Spec-Driven Development approaches, as it affects their workflow and collaboration with AI coding tools

Key Insight

💡 Simpler approaches can be more effective than complex frameworks for certain projects

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🚀 Simple Instructions.md file outperforms OpenSpec's Spec-Driven Development in experiment! 💡

Key Takeaways

OpenSpec's Spec-Driven Development approach failed an experiment due to complexity, while a simpler Instructions.md file achieved faster results

Full Article

There’s a lot of discussion right now about how developers should work with AI coding tools. Over the past year we’ve seen the rise of two very different philosophies: 1. Vibe Coding — just prompt the AI and iterate quickly 2. Spec-Driven Development — enforce structure so AI understands requirements Frameworks like OpenSpec are trying to formalize the second approach. Instead of giving AI simple prompts, the w
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