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CODENS is a novel system that transforms pull requests into dynamic and queryable documentation by constructing a typed software knowledge graph that captures design knowledge from code changes. The system enhances documentation accessibility and relevance through schema-driven semantic extraction and various retrieval modes, including agent-guided graph traversal for effective question answering. Evaluation on a Ruby on Rails project demonstrates that CODENS yields highly relevant answers, although challenges remain in synthesizing concise documentation.
CODENS turns pull requests into a living knowledge graph, making code documentation both dynamic and easily queryable.
Maintaining up-to-date code documentation is difficult in fast-moving repositories because design knowledge is scattered across source files and pull requests. We present CODENS , a system that turns pull requests into living, accessible, and queryable documentation for production codebases. CODENS incrementally builds a typed software knowledge graph from pull requests, enriches components through schema-driven semantic extraction, derives typed relations between them, and exposes the resulting knowledge through three retrieval modes, including agent-guided graph traversal for repository-level question answering. The system also preserves semantic change history across pull requests and integrates both answer-quality and operational evaluation metrics. We evaluate CODENS on a client Ruby on Rails project in production. Results show that CODENS produces highly relevant and well-grounded answers, while qualitative feedback highlights a remaining challenge in concise, documentation-oriented synthesis.
