Gemini CLI for Legacy Project Refactoring

With Gemini CLI, I’m able to keep my pet projects alive and kicking

Paulo Henrique utilized the Gemini CLI to revive legacy MVPs from 2023 and 2024. The tool successfully updated projects like Choose Your Own AIdventure to 2026 standards by executing automated refactoring plans.

Why This Matters

In technical reality, pet projects often succumb to bit rot as APIs change and libraries become outdated, creating a maintenance burden that competes with professional work. Gemini CLI bridges the gap between ideal architectural visions and the time constraints of human developers by acting as an agentic Junior Dev that can execute complex code modifications directly in the terminal.

Key Insights

• Automated dependency updates: Gemini CLI evaluated and updated 2023 Next.js code to 2026 standards.
• Agentic workflow: Using a GEMINI.md file to define strict operational boundaries and rules for the AI agent.
• Productivity macros: Implementation of a That’s all, folks! command to automate changelog updates and session closing.
• Feature expansion: The SEO Toolbox grew from two simple features to a comprehensive suite including Competitor Analysis and Meta Tag Generation.
• Reasoning styles: Managing Gemini like a Junior Dev to prevent it from acting without authorization or overthinking solutions.

Practical Applications

• Legacy Code Salvage: Using CLI agents to pry open and refactor outdated repositories when manual energy is low. Pitfall: AI hallucinating code or entering loops if build processes fail to terminate.
• Terminal-based Mockups: Generating front-end layouts and execution plans directly in Markdown. Pitfall: Over-reliance on AI autonomy leading to unauthorized modifications of unrequested files.

References:

• https://dev.to/phalkmin/with-gemini-cli-im-able-to-keep-my-pet-projects-alive-and-kicking-2fll