Code Isn't Memory: A Structural Codebase Index Inside a Coding Agent

The study introduces a structural codebase index within a coding agent framework utilizing Claude Opus 4.7, demonstrating significant improvements in localization and resolution without incurring additional costs. The experimental setup compared three configurations: with the index, without it, and against an agentic-grep baseline, confirming that the index yields better performance metrics while maintaining lower costs per solved instance. This advancement is crucial for practitioners as it highlights the potential for enhanced code retrieval efficiency in multi-file change scenarios, optimizing coding agent operations.