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The Economic Benefit of Refactoring

martinfowler.com

July 30, 2026

17 min read

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53/100

Summary

Refactoring can lead to significant economic benefits in software development by improving code quality and maintainability. A sophisticated application was developed to support agentic engineering, featuring a high-quality web UI, dynamic updates, external system integrations, and machine learning capabilities.

Key Takeaways

The application built for agentic engineering consists of approximately 150,000 lines of code, primarily in Rust, with additional components in TypeScript and Terraform.
The data access layer of the application grew to 17,155 lines of code without proper de-duplication or function extraction, making it a prime candidate for refactoring.
An experiment was conducted to refactor the data access layer, demonstrating that refactoring can reduce the token cost for future feature implementations.
The refactoring process involved a systematic approach to apply changes and measure the impact on token consumption and execution time at each step.

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Community Sentiment

Mixed

Positives

LLMs are finally making it feasible to edit and refactor code that was previously a tangled mess — we're witnessing a revolution in code manageability.
Agents have come a long way in refactoring; with the right prompts, they can efficiently tackle specific tasks like implementing `functools.partial` — that’s a game changer.
The ability to refactor code quickly, like cutting months of work down to a week, shows the potential of human-AI collaboration in software development.
Having empirical evidence that well-factored code enhances LLM performance is a relief — it validates longstanding best practices that often get ignored.

Concerns

The concern that AI tooling locks us into a cycle of bad code generation is valid; if we can't understand or manage the output, we're in trouble.
Some commenters argue that AI agents can actually worsen situations, turning average developers into bad hires because they can now work faster but with less oversight.
Skeptics worry that asking agents to refactor without a holistic understanding of the project is like asking trauma surgeons to improve fitness — it just doesn’t make sense.