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Decoding a legacy system nobody understood

A vibe-coded tool that explained an inherited system so the team could estimate a project.

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Credits

  • Repository account PearlThoughts Source ↗
  • HN submitter seng Source ↗

Earliest dated source: 25 Nov 2025

Code ↗

The full story

A team inherited a decade-old Yii2 PHP codebase that two earlier teams had failed to modernise, and couldn't estimate the work because nobody understood how it worked. The author vibe-coded CodeCompass, a code-intelligence tool that maps and explains a legacy system, so the team could finally plan the project. A filtered public version is on GitHub.

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Sources

From the maker's own write-up or code. We summarise what they report; we haven't tested it ourselves.

  • Hacker News: Show HN: I vibe-coded a tool to decode a legacy system nobody understoodCode or repositorygithub.com
    Repository account: PearlThoughts

    The public version of the tool.

  • Hacker News discussion (4 points)Forum threadnews.ycombinator.com
    HN submitter: sengPosted 25 Nov 2025

    The Show HN post with the backstory.

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