Rustly

Rustly provides local observability for coding agents, allowing developers to understand and optimize their interactions with services like Claude Code, Codex, and Cursor. Key features include: • Track token, context window, and monetary spend per request • Identify prompt cache breakage points and causes • Detect unused tool schemas and duplicate work • Monitor every request made by coding agents • Operate entirely on your local machine for privacy This tool helps pinpoint inefficiencies in coding agent usage, such as unnecessary re-reads of cached prompts due to minor changes or large, uncalled tool schemas being sent with every request. Developers can analyze detailed metrics to understand why costs are rising, context windows are filling up, and responses are slowing down, empowering them to make informed adjustments to their prompts and configurations. Rustly is designed for software developers, engineers, and development teams who use coding assistants and need transparency into resource consumption. It's ideal for optimizing prompt engineering, reducing operational costs, and improving the overall efficiency of development workflows.