# The Economic Benefit of Refactoring

DevFeed: [The Economic Benefit of Refactoring](<https://devfeed.tech/articles/the-economic-benefit-of-refactoring-4417.md>)

Original publisher: [Read original article](<https://martinfowler.com/articles/exploring-gen-ai/refactoring-economic-benefit.html>)

Author: Martin Fowler (martin@martinfowler.com)

Published: 2026-07-30T13:04:00Z

Content type: article

Language: en

Sources: [Martin Fowler](<https://devfeed.tech/sources/martin-fowler.md>)

Topics: [Refactoring](<https://devfeed.tech/topics/refactoring.md>), [Rust](<https://devfeed.tech/topics/rust.md>), [AI Development](<https://devfeed.tech/topics/ai-development.md>), [TypeScript](<https://devfeed.tech/topics/typescript.md>), [Terraform](<https://devfeed.tech/topics/terraform.md>), [Terminal](<https://devfeed.tech/topics/terminal.md>)

Tags: [agentic](<https://devfeed.tech/tags/agentic.md>), [cursor](<https://devfeed.tech/tags/cursor.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [refactoring](<https://devfeed.tech/tags/refactoring.md>), [rust](<https://devfeed.tech/tags/rust.md>), [terminal](<https://devfeed.tech/tags/terminal.md>), [terraform](<https://devfeed.tech/tags/terraform.md>), [tokens](<https://devfeed.tech/tags/tokens.md>), [typescript](<https://devfeed.tech/tags/typescript.md>)

## AI overview

An experiment examines whether refactoring an agent-written codebase can reduce the token cost of implementing future features. The application contains about 150,000 lines of primarily Rust code, with TypeScript and Terraform, and includes a 17,155-line data access module that became a target for systematic refactoring. Fresh sub-agents repeat the same representative change after each refactoring step so token consumption can be compared without learning effects.

## Source excerpt

Giles Edwards-Alexander does an experiment to see if decomposing a large function helps reduce token costs, suggesting that is may now be possible to measure the economic benefit of refactoring more...