Repo Tour
A guided five-stop tour of any codebase, generated on the fly. Built for Pair Programmer's Apprentice — use lumen forge to build a tool for developers who are new to a codebase. Tour generation and the step-through UI. The interface is deliberately narrow: one path, done properly, rather than a broad surface that half-works at the deadline.
Gallery
Screens
Repo Tour — main view
Repo Tour — result state
On the clock
What shipped, what didn't
Completed in time
Tour generation and the step-through UI.
Unfinished / faked
Tour quality drops sharply on monorepos.
Obstacles
Rate limits hit at minute 20 and forced a caching layer I hadn't planned for.
Lessons learned
Scope down before the timer starts, not at minute 20 when you're already committed.
Process
Prompting approach
Started from a single system prompt describing the user and their constraint, then iterated with the assistant on the Repo Tour data model before writing any interface code. Full prompt log is in the repository under /prompts.
Fairness
Disclosures
Declared by the builder at submission time, visible to judges before scoring.
Started from the official framework starter template, unmodified.
Judging
Public feedback
Judges' private notes stay private — this is what they chose to say publicly.
Elena Voss
VP of Engineering, Harbor Compute
Good instinct on the problem. I would have liked to see the model doing more of the reasoning rather than formatting output.
Marcus Bell
Founder, Bellwether Studio
The idea is strong and the execution is most of the way there. The demo path broke once, which is what separates this from the top three today.
Hana Kobayashi
Principal Research Engineer, Independent
Good instinct on the problem. I would have liked to see the model doing more of the reasoning rather than formatting output.
Discussion
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