Multiple tools launch for AI coding agent cost monitoring and observability

According to GitHub repositories, multiple tools are launching to track and optimize AI agent spending: aireceipts shows real-time billing during agent sessions, Kotro reduces Cursor API costs by 68 percent via local proxy, and Promptster analyzes engineer fluency metrics. These tools address growing developer need to monitor expenses as agentic AI adoption increases.

Update (2026-07-16): Agnost AI (YC S26) and Aireceipts launched tools to identify behavioral failures in production agent deployments and itemize session costs. According to their documentation, Agnost AI analyzes real conversations to surface where users get stuck, frustrat...